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Direct self-reference leading to cycle [Java | Spring Boot]

Complete log -
https://filetransfer.io/data-package/lWVCkcpK#link
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Direct self-reference leading to cycle (through reference chain: org.springframework.web.client.HttpClientErrorException$NotFound["mostSpecificCause"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1306) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter._handleSelfReference(BeanPropertyWriter.java:949) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:774) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1572) ~[jackson-databind-2.14.1.jar:2.14.1]
at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:1061) ~[jackson-databind-2.14.1.jar:2.14.1]
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:483) ~[spring-web-6.0.4.jar:6.0.4]
at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:103) ~[spring-web-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:297) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:245) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:78) ~[spring-web-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:135) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:884) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1080) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:973) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011) ~[spring-webmvc-6.0.4.jar:6.0.4]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914) ~[spring-webmvc-6.0.4.jar:6.0.4]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:731) ~[tomcat-embed-core-10.1.5.jar:6.0]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.0.4.jar:6.0.4]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:814) ~[tomcat-embed-core-10.1.5.jar:6.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:223) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-10.1.5.jar:10.1.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.0.4.jar:6.0.4]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.4.jar:6.0.4]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.0.4.jar:6.0.4]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.4.jar:6.0.4]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.0.4.jar:6.0.4]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.4.jar:6.0.4]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:177) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:119) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:400) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:859) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1734) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.5.jar:10.1.5]
at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
I have seen similar questions but I could not fix my problem.
I have 2 microservices User and Account.
I am trying to send a POST request to add user -
It should add user to the list which I have in UserServiceImpl which you can see below and send a post request to Account-Service that adds an account to the accountList.
Code is attached below for user service -
User Entity (User.java)
public class User {
public Integer userId;
private String name;
private String email;
private Account account;
Account Entity (Account.java)
public class Account {
private Integer accNo;
private Integer accountBalance;
private Integer userId;
All getters setters etc not shown but its there.
My User Service -
#Service
public class UserServiceImpl implements UserService{
#Autowired
RestTemplate restTemplate;
ArrayList<User> userList = new ArrayList<User>(
Arrays.asList(
new User(1311, "Vaibhav Shrivastava", "innomightmail#gmail.com"),
new User(1312, "Varun Shrivastava", "varun#gmail.com"),
new User(1313, "Rajesh Shrivastava", "rajesh#gmail.com"))
);
#Override
public User getUser(Integer id) {
// TODO Auto-generated method stub
System.out.println(this.userList.stream().filter(user -> user.getUserId().equals(id)).findAny().orElse(null));
return this.userList.stream().filter(user -> user.getUserId().equals(id)).findAny().orElse(null);
}
#Override
public List<User> getAllUsers() {
// TODO Auto-generated method stub
return userList;
}
#Override
public <T> ResponseEntity<User> addUser(User user) {
// TODO Auto-generated method stub
userList.add(user);
Account newAccount = new Account(1004, 0, 1314);
this.restTemplate.postForObject("http://account-service/account/add-account/", newAccount, Account.class);
return new ResponseEntity<User>((User)user, HttpStatus.OK);
}
User Controller (UserController.java)
#RestController
#RequestMapping("/user")
public class UserController {
#Autowired
private UserService userService;
#Autowired
private RestTemplate restTemplate;
#GetMapping("/{userId}")
public User getUser(#PathVariable("userId") Integer userId) {
User user = this.userService.getUser(userId);
Account account = this.restTemplate.getForObject("http://account-service/account/user/" + user.getUserId(), Account.class);
user.setAccount(account);
return user;
}
#GetMapping("/all-users")
public List<User> getAllUsers(){
return this.userService.getAllUsers();
}
#PostMapping("/add-user")
public ResponseEntity<Object> addUser(#RequestBody User user) {
try {
User newUser = new User(user.getUserId(), user.getName(), user.getEmail());
this.userService.addUser(newUser);
return new ResponseEntity<>(user, HttpStatus.CREATED);
} catch (Exception e) {
return new ResponseEntity<>(e, HttpStatus.INTERNAL_SERVER_ERROR);
}
}
add account api on Account service is working fine on its own.
When I send post request to add user, it adds user but it does not create account and gives the error -
aborted could not get response in postman and you can see the log.
I want to send a post request on add-user api which will create user and adds it to userList and sends a post request to account service add-account api which creates account and adds to Account List.

Cannot pass a null GrantedAuthority collection

Hey i'm a newbie at Spring Boot i'm trying to make a spring secrity project
but i had this problem and i'm stuck
i will show you samples of the codes:
#Service
public class CustomUserDetailsService implements UserDetailsService {
#Autowired
private UserRepository userDao;
#Autowired
private PasswordEncoder bcryptEncoder;
#Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
List<SimpleGrantedAuthority> roles = null;
DAOUser user = userDao.findByUsername(username);
if (user != null) {
roles = Arrays.asList(new SimpleGrantedAuthority(user.getRole()));
return new User(user.getUsername(), user.getPassword(), roles);
}
throw new UsernameNotFoundException("User not found with the name " + username); }
public DAOUser save(UserDTO user) {
DAOUser newUser = new DAOUser();
newUser.setUsername(user.getUsername());
newUser.setPassword(bcryptEncoder.encode(user.getPassword()));
newUser.setRole(user.getRole());
return userDao.save(newUser);
}
}
#Service
public class JwtUtil {
private String secret;
private int jwtExpirationInMs;
private int refreshExpirationDateInMs;
#Value("${jwt.secret}")
public void setSecret(String secret) {
this.secret = secret;
}
#Value("${jwt.expirationDateInMs}")
public void setJwtExpirationInMs(int jwtExpirationInMs) {
this.jwtExpirationInMs = jwtExpirationInMs;
}
#Value("${jwt.refreshExpirationDateInMs}")
public void setRefreshExpirationDateInMs(int refreshExpirationDateInMs) {
this.refreshExpirationDateInMs = refreshExpirationDateInMs;
}
private Session session ;
public Map<String, String> generateToken(UserDetails userDetails) {
Map<String, Object> claims = new HashMap<>();
Collection<? extends GrantedAuthority> roles = userDetails.getAuthorities();
if (roles.contains(new SimpleGrantedAuthority("ROLE_ADMIN"))) {
claims.put("isAdmin", true);
}
if (roles.contains(new SimpleGrantedAuthority("ROLE_USER"))) {
claims.put("isUser", true);
}
Map<String, String> tokens = new HashMap<>();
String AccessToken = doGenerateToken(claims, userDetails.getUsername());
String RefreshToken = doGenerateRefreshToken(claims, userDetails.getUsername()) ;
tokens.put("AccessToken", AccessToken);
tokens.put("RefreshToken", RefreshToken);
return tokens;
}
private String doGenerateToken(Map<String, Object> claims, String subject) {
return Jwts.builder().setClaims(claims).setSubject(subject).setIssuedAt(new Date(System.currentTimeMillis()))
.setExpiration(new Date(System.currentTimeMillis() + jwtExpirationInMs))
.signWith(SignatureAlgorithm.HS512, secret).compact();
}
public String doGenerateRefreshToken(Map<String, Object> claims, String subject) {
return Jwts.builder().setClaims(claims).setSubject(subject).setIssuedAt(new Date(System.currentTimeMillis()))
.setExpiration(new Date(System.currentTimeMillis() + refreshExpirationDateInMs))
.signWith(SignatureAlgorithm.HS512, secret).compact();
}
public boolean validateToken(String authToken) {
try {
Jws<Claims> claims = Jwts.parser().setSigningKey(secret).parseClaimsJws(authToken);
return true;
} catch (SignatureException | MalformedJwtException | UnsupportedJwtException | IllegalArgumentException ex) {
throw new BadCredentialsException("INVALID_CREDENTIALS", ex);
} catch (ExpiredJwtException ex) {
throw ex;
}
}
public String getUsernameFromToken(String token) {
Claims claims = Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
return claims.getSubject();
}
public List<SimpleGrantedAuthority> getRolesFromToken(String token) {
Claims claims = Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
List<SimpleGrantedAuthority> roles = null;
Boolean isAdmin = claims.get("isAdmin", Boolean.class);
Boolean isUser = claims.get("isUser", Boolean.class);
if (isAdmin != null && isAdmin) {
roles = Arrays.asList(new SimpleGrantedAuthority("ROLE_ADMIN"));
}
if (isUser != null && isAdmin) {
roles = Arrays.asList(new SimpleGrantedAuthority("ROLE_USER"));
}
return roles;
}
}
#RestController
public class AuthenticationController {
#Autowired
private AuthenticationManager authenticationManager;
#Autowired
private CustomUserDetailsService userDetailsService;
#Autowired
private JwtUtil jwtUtil;
#RequestMapping(value = "/authenticate", method = RequestMethod.POST)
public ResponseEntity<?> createAuthenticationToken(#RequestBody AuthenticationRequest authenticationRequest , TokensRepo tokensRepo)
throws Exception {
try {
authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(
authenticationRequest.getUsername(), authenticationRequest.getPassword()));
} catch (DisabledException e) {
throw new Exception("USER_DISABLED", e);
}
catch (BadCredentialsException e) {
throw new Exception("INVALID_CREDENTIALS", e);
}
UserDetails userdetails = userDetailsService.loadUserByUsername(authenticationRequest.getUsername());
Map<String, String> token = jwtUtil.generateToken(userdetails);;
Session newSession = new Session();
newSession.setTokens(token);
newSession.setSession_date(new Date());
return ResponseEntity.ok(token);
}
#RequestMapping(value = "/register", method = RequestMethod.POST)
public ResponseEntity<?> saveUser(#RequestBody UserDTO user) throws Exception {
return ResponseEntity.ok(userDetailsService.save(user));
}
public Map<String, Object> getMapFromIoJsonwebtokenClaims(DefaultClaims claims) {
Map<String, Object> expectedMap = new HashMap<String, Object>();
for (Entry<String, Object> entry : claims.entrySet()) {
expectedMap.put(entry.getKey(), entry.getValue());
}
return expectedMap;
}
}
When i tested the /authenticate api i got the access tokens and the refresh token
but when i tried to use one of them i got this error
java.lang.IllegalArgumentException: Cannot pass a null GrantedAuthority collection
at org.springframework.util.Assert.notNull(Assert.java:201) ~[spring-core-5.3.19.jar:5.3.19]
at org.springframework.security.core.userdetails.User.sortAuthorities(User.java:162) ~[spring-security-core-5.6.3.jar:5.6.3]
at org.springframework.security.core.userdetails.User.(User.java:118) ~[spring-security-core-5.6.3.jar:5.6.3]
at org.springframework.security.core.userdetails.User.(User.java:87) ~[spring-security-core-5.6.3.jar:5.6.3]
at com.Gadour.App.Security.CustomJwtAuthenticationFilter.doFilterInternal(CustomJwtAuthenticationFilter.java:40) ~[classes/:na]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183) ~[spring-security-web-5.6.3.jar:5.6.3]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) ~[spring-web-5.3.19.jar:5.3.19]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.19.jar:5.3.19]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.19.jar:5.3.19]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.19.jar:5.3.19]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.19.jar:5.3.19]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.62.jar:9.0.62]
at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]

fix JPA refused to findUserByUsername

I am new to spring boot. I am trying to use spring security to add authentication and authorization to my api but JPA refused to findUserByUsername. It's(JPA) returning null even though the user is in the database.
Please Note that the app runs fine but when I try to login with a user this exception raise
Please view the error and source code below
error
2022-03-03 05:06:48.427 ERROR 9024 --- [nio-8080-exec-1] c.m.s.f.CustomUserAuthenticationFilter : An internal error occurred while trying to authenticate the user.
org.springframework.security.authentication.InternalAuthenticationServiceException: User with email not found!
at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:108) ~[spring-security-core-5.6.1.jar:5.6.1]
at org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:133) ~[spring-security-core-5.6.1.jar:5.6.1]
at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:182) ~[spring-security-core-5.6.1.jar:5.6.1]
at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:201) ~[spring-security-core-5.6.1.jar:5.6.1]
at org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter$AuthenticationManagerDelegator.authenticate(WebSecurityConfigurerAdapter.java:518) ~[spring-security-config-5.6.1.jar:5.6.1]
at com.maxapp.server.filter.CustomUserAuthenticationFilter.attemptAuthentication(CustomUserAuthenticationFilter.java:33) ~[classes/:na]
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:223) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:213) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183) ~[spring-security-web-5.6.1.jar:5.6.1]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) ~[spring-web-5.3.15.jar:5.3.15]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.15.jar:5.3.15]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.15.jar:5.3.15]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.15.jar:5.3.15]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
at java.base/java.lang.Thread.run(Thread.java:831) ~[na:na]
Caused by: java.lang.IllegalStateException: User with email not found!
at com.maxapp.server.service.UserService.loadUserByUsername(UserService.java:30) ~[classes/:na]
at com.maxapp.server.service.UserService$$FastClassBySpringCGLIB$$c230548a.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.15.jar:5.3.15]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:783) ~[spring-aop-5.3.15.jar:5.3.15]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.15.jar:5.3.15]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:753) ~[spring-aop-5.3.15.jar:5.3.15]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.15.jar:5.3.15]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.15.jar:5.3.15]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.15.jar:5.3.15]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.15.jar:5.3.15]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:753) ~[spring-aop-5.3.15.jar:5.3.15]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:698) ~[spring-aop-5.3.15.jar:5.3.15]
at com.maxapp.server.service.UserService$$EnhancerBySpringCGLIB$$8c176907.loadUserByUsername(<generated>) ~[classes/:na]
at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:93) ~[spring-security-core-5.6.1.jar:5.6.1]
... 55 common frames omitted
Source Code
Model Classes
User
package com.maxapp.server.model;
import org.hibernate.annotations.CreationTimestamp;
import javax.persistence.*;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collection;
import static javax.persistence.FetchType.EAGER;
#Entity
#Table(name="users")
public class User {
#Id
#SequenceGenerator(
name="user_sequence",
sequenceName="user_sequence",
allocationSize = 1
)
#GeneratedValue(
strategy = GenerationType.SEQUENCE,
generator = "user_sequence"
)
private long id;
private String name;
#Column(name="username", unique=true, nullable = false)
private String username;
#Column(name="password", nullable = false)
private String password;
#ManyToMany(fetch = EAGER)
private Collection<Role> roles = new ArrayList<>();
#CreationTimestamp
private LocalDateTime createdAt;
public User(){
}
public User(String name, String username, String password) {
this.name = name;
this.username = username;
this.password = password;
}
public String getPassword() {
return password;
}
public long getId() {
return id;
}
public String getName() {
return name;
}
public String getUsername() {
return username;
}
public Collection<Role> getRoles() {
return roles;
}
public LocalDateTime getCreatedAt() {
return createdAt;
}
public void setName(String name) {
this.name = name;
}
public void setPassword(String password) {
this.password = password;
}
#Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", username='" + username + '\'' +
", createdAt=" + createdAt +
'}';
}
}
Role
package com.maxapp.server.model;
import lombok.Data;
import javax.persistence.*;
#Data
#Entity
#Table(name="roles")
public class Role {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
public Role() {
}
public Role(String name) {
this.name = name;
}
}
Repo
UserRepo
package com.maxapp.server.repository;
import com.maxapp.server.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
#Repository
public interface UserRepository extends JpaRepository<User,Long> {
User findUserById(Long id);
User findUserByUsername(String username);
}
RoleRepo
package com.maxapp.server.repository;
import com.maxapp.server.model.Role;
import org.springframework.data.jpa.repository.JpaRepository;
public interface RoleRepository extends JpaRepository<Role,Long> {
Role findRoleByName(String name);
}
Service
UserService
package com.maxapp.server.service;
import com.maxapp.server.model.Role;
import com.maxapp.server.model.User;
import com.maxapp.server.repository.RoleRepository;
import com.maxapp.server.repository.UserRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
#Service #RequiredArgsConstructor #Transactional
public class UserService implements UserDetailsService {
private final UserRepository userRepository;
private final RoleRepository roleRepository;
private final PasswordEncoder passwordEncoder;
#Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
User user = userRepository.findUserByUsername(username);
if(user==null){
throw new IllegalStateException("User with email not found!");
}
Collection<SimpleGrantedAuthority> authorities = new ArrayList<>();
user.getRoles().forEach(role ->{
authorities.add(new SimpleGrantedAuthority(role.getName()));
});
return new org.springframework.security.core.userdetails.User(user.getUsername(),user.getPassword(),authorities);
}
public List<User> getAllUsers() {
return userRepository.findAll();
}
public User createUser(User user) {
user.setPassword(passwordEncoder.encode(user.getPassword()));
return userRepository.save(user);
}
public Role saveRole(Role role){
return roleRepository.save(role);
}
public void addRoleToUser(Long id,String name){
User user = userRepository.findUserById(id);
Role role = roleRepository.findRoleByName(name);
user.getRoles().add(role);
}
public User getSingleUser(Long id) {
boolean exist = userRepository.existsById(id);
if(!exist){
throw new IllegalStateException("User with id : " + id + " not found.");
}
return userRepository.findUserById(id);
}
public void deleteUser(Long id) {
boolean exist = userRepository.existsById(id);
if(!exist){
throw new IllegalStateException("User with id : " + id + " not found.");
}
userRepository.deleteById(id);
}
public void updateUser(Long id, String name) {
User user = userRepository.findById(id).orElseThrow(()-> new IllegalStateException("User with id : " + id + " not found."));
if(name != null && name.length()>0 && !(name.equalsIgnoreCase(user.getName()))){
user.setName(name);
}
}
}
Controller
UserController
package com.maxapp.server.controller;
import com.maxapp.server.model.Role;
import com.maxapp.server.model.User;
import com.maxapp.server.service.UserService;
import lombok.Data;
import org.springframework.web.bind.annotation.*;
import java.util.List;
#RestController
#RequestMapping(path="api/v1")
public class UserController {
private final UserService userService;
public UserController(UserService userService) {
this.userService = userService;
}
#GetMapping(path="users")
public List<User> getAllUsers(){
return userService.getAllUsers();
}
#PostMapping(path="users")
public User createUser(#RequestBody User user){
return userService.createUser(user);
}
#PostMapping(path="roles")
public Role createRole(#RequestBody Role role){
return userService.saveRole(role);
}
#PostMapping(path="users/roles")
public void addRoleToUser(#RequestBody RoleForm role){
userService.addRoleToUser(role.getId(),role.getName());
}
#GetMapping(path="users/{id}")
public User getSingleUser(#PathVariable("id") Long id){
return userService.getSingleUser(id);
}
#PutMapping(path="users/{id}")
public void updateUser(
#PathVariable("id") Long id,
#RequestParam(required = false) String name
){
userService.updateUser(id,name);
}
#DeleteMapping(path="users/{id}")
public void deleteUser(#PathVariable("id") Long id){
userService.deleteUser(id);
}
}
#Data
class RoleForm{
private Long id;
private String name;
}
Filter
CustomUserAuthenticationFilter
package com.maxapp.server.filter;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import lombok.RequiredArgsConstructor;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Date;
import java.util.stream.Collectors;
#RequiredArgsConstructor
public class CustomUserAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
private final AuthenticationManager authenticationManager;
#Override
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
String email = request.getParameter("username");
String password = request.getParameter("password");
UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken(email,password);
return authenticationManager.authenticate(usernamePasswordAuthenticationToken);
}
#Override
protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {
User user = (User)authResult.getPrincipal();
Algorithm algorithm = Algorithm.HMAC256("Maxwell1".getBytes());
String access_token = JWT.create()
.withSubject(user.getUsername())
.withExpiresAt(new Date(System.currentTimeMillis()+10*60*1000))
.withIssuer(request.getRequestURI())
.withClaim("roles",user.getAuthorities().stream().map(GrantedAuthority::getAuthority).collect(Collectors.toList()))
.sign(algorithm);
String refresh_token = JWT.create()
.withSubject(user.getUsername())
.withExpiresAt(new Date(System.currentTimeMillis()+30*60*1000))
.withIssuer(request.getRequestURI())
.sign(algorithm);
response.setHeader("access_token",access_token);
response.setHeader("refresh_token",refresh_token);
}
}
Security
SecurityConfig
package com.maxapp.server.security;
import com.maxapp.server.filter.CustomUserAuthenticationFilter;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
#Configuration #EnableWebSecurity #RequiredArgsConstructor
public class SecurityConfig extends WebSecurityConfigurerAdapter {
private final UserDetailsService userDetailsService;
private final BCryptPasswordEncoder bCryptPasswordEncoder;
#Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(userDetailsService).passwordEncoder(bCryptPasswordEncoder);
}
#Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable();
http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
http.authorizeRequests().anyRequest().permitAll();
http.addFilter(new CustomUserAuthenticationFilter(authenticationManagerBean()));
}
#Bean
#Override
public AuthenticationManager authenticationManagerBean() throws Exception {
return super.authenticationManagerBean();
}
}
Application Class
package com.maxapp.server;
import com.maxapp.server.model.Role;
import com.maxapp.server.model.User;
import com.maxapp.server.service.UserService;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.web.bind.annotation.RestController;
#SpringBootApplication
#RestController
public class ServerApplication {
public static void main(String[] args) {
SpringApplication.run(ServerApplication.class, args);
}
#Bean
PasswordEncoder passwordEncoder(){
return new BCryptPasswordEncoder();
}
#Bean
CommandLineRunner runs(UserService userService){
return args ->{
userService.saveRole(new Role("Admin"));
userService.saveRole(new Role("Student"));
userService.createUser(new User("Maxwell","mall#gamil.com","1234"));
userService.createUser(new User("Maxwel","ma1ll#gamil.com","1234"));
userService.addRoleToUser(1L,"Admin");
userService.addRoleToUser(2L,"Student");
};
}
}

Removing #gmail.com from my username solved my problem.
Actually the problem was findUserByUsername method was expecting string but I was passing Gmail.
Thank you all for your quick responses. I do appreciate you all!

findUserByUsername will not work
either use JPA-Query using
#Query("your required query")
OR
make it findByUsername(String username)
I would recommend to use JPA-Buddy Extension to omit these kind of errors

I guess that the method should be:
Optional<User> findByUsername(String username);

Unable to get data from h2

I'm trying to do a simple task. I've an API which is trying to create a post using userId and post desc as params. I'm initializing users in h2 DB directly using data.sql. In PostService, I'm trying to get user by userId using userRepo.findById(userId). The param is passed to the service from the request. However, I'm not getting any users. I'm getting a NullPointerException. I checked the h2 db and I can see my users being present. Even the sout's are not working.
Tried a few answers from internet, no luck as of yet.
Here's the code:
User.java
package com.interview.LLD.demo;
import javax.persistence.*;
#Entity
#Table(name = "User")
public class User {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
public User() {
}
public User(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
PostController.java
package com.interview.LLD.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
#RestController
#RequestMapping("/posts")
public class PostController {
#Autowired
private PostService postService;
#PostMapping("/create")
public Post createPost(#RequestBody CreatePostRequestBody createPostRequestBody) {
try {
return postService.createPost(createPostRequestBody.getDesc(), createPostRequestBody.getPostId());
}
catch (Exception e) {
System.out.println("e = " + e.getMessage());
return null;
}
}
#GetMapping("/getAllByUser")
public List<Post> getAllPostsByUser(#PathVariable Integer user) {
return postService.getAllPostsByUser(user);
}
}
PostService.java
package com.interview.LLD.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
#Service
public class PostService {
#Autowired
private PostRepo postRepo;
#Autowired
private UserRepo userRepo;
public Post createPost(String postDesc, int userId) throws Exception {
System.out.println("no of users = " + userRepo.count());
userRepo.findAll().forEach(e -> System.out.print(e.getId() + " " + e.getName()));
User user = userRepo.findById(2).orElseThrow(Exception::new);
Post post = new Post(postDesc, user);
return postRepo.save(post);
}
public List<Post> getAllPostsByUser(int userId) {
User user = userRepo.findById(userId).get();
return postRepo.getAllPostsByUser(user);
}
}
data.sql
DROP TABLE IF EXISTS User;
CREATE TABLE User (
id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(250) NOT NULL
);
INSERT INTO User (name) VALUES
('Karan'),
('Ben'),
('John');
application.properties
server.port = 8081
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_ON_EXIT=FALSE;
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.main.allow-bean-definition-overriding=true
spring.jpa.hibernate.ddl-auto=update
spring.sql.init.data-locations=classpath:data.sql
spring.datasource.initialization-mode=always
Post.java
package com.interview.LLD.demo;
import javax.persistence.*;
#Entity
#Table(name = "Post")
public class Post {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int postId;
private String postDesc;
#ManyToOne
#JoinColumn(name = "id",nullable = false)
private User user;
public Post() {
}
public Post(String postDesc, User user) {
this.postDesc = postDesc;
this.user = user;
}
public int getPostId() {
return postId;
}
public String getPostDesc() {
return postDesc;
}
public void setPostDesc(String postDesc) {
this.postDesc = postDesc;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
StackTrace:
java.lang.NullPointerException
at com.interview.LLD.demo.PostController.createPost(PostController.java:17)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:681)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Thanks in advance.

Got it!
A silly mistake but I'm a noob to spring boot. In the #RequestBody class, I'd named the int param differently as to what I was sending in the request. My question then is, in spring do we have to have same names in request and in the class variables?

Why do you declare your path variable there and you don't use it ?
#GetMapping("/getAllByUser")
public List<Post> getAllPostsByUser(#PathVariable Integer user) {
return postService.getAllPostsByUser(user);
}
Instead you should pass the user id in the URL of the post request:
#GetMapping("/getAllByUser/{user})
public List<Post> getAllPostsByUser(#PathVariable("user") Integer user) {
return postService.getAllPostsByUser(user);
}
Of course it will trow a NullPointerException because you are calling the API with a null user.

NullPointerException in sprinboot+jpa+gradle

As the title says I'm getting a null pointer exception when I call a method in my data repository to retrieve some data. I'm making an API with the Spring Boot framework using JPA+Hibernate
I've checked if the method parameters are null or empty but all the parameters are good. I also tried changing the query but I'm getting the same nullpointerexception on execution time.
java.lang.NullPointerException: Cannot invoke "com.cg.entites.User.getUsername()" because "u2" is null
at com.cg.contoller.UserController.addUser(UserController.java:45) ~[main/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.6.jar:5.3.6]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.6.jar:5.3.6]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.6.jar:5.3.6]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.6.jar:5.3.6]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.45.jar:9.0.45]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
1.User class
package com.cg.entites;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="Users")
public class User implements Serializable{
private static final long serialVersionUID = 1L;
#Id
private int id;
private String username;
private String password;
private String role;
public User() {
super();
}
public User(int id, String username, String password, String role) {
super();
this.id = id;
this.username = username;
this.password = password;
this.role = role;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
#Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password + ", role=" + role + "]";
}
}
2.UserRepository
package com.cg.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.cg.entites.User;
import com.cg.exceptions.InvalidException;
#Repository("urepo")
public interface UserRepository extends JpaRepository<User,Integer>{
#Query("SELECT u FROM User u WHERE u.username = :username")
public User getUserByUsername(#Param("username") String username);
}
3.UserService
package com.cg.service;
import java.util.List;
import java.util.Optional;
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import com.cg.dao.UserRepository;
import com.cg.entites.User;
import com.cg.exceptions.InvalidException;
#Service
public class UserServiceImpl implements UserService{
#Autowired
UserRepository urepo;
#Override
public List<User> getAllUsers() {
// TODO Auto-generated method stub
List<User> ulist=urepo.findAll();
return ulist;
}
#Override
#Transactional
public User addUser(User user) {
// TODO Auto-generated method stub
return urepo.save(user);
}
#Override
#Transactional
public User removeUser(int userId) {
// TODO Auto-generated method stub
Optional<User> u=urepo.findById(userId);
if(u.empty()!=null) {
urepo.deleteById(userId);
return u.get();
}
return null;
}
#Override
#Transactional
public User validateUser(String username, String password) throws InvalidException{
User u=urepo.getUserByUsername(username);
System.out.println("u details"+u);
if(u==null) {
System.out.println("InValid User");
}
return u;
}
}
4.userException
package com.cg.exceptions;
public class InvalidException extends Exception {
public InvalidException(String msg) {
super(msg);
}
}
5.UserContoller
package com.cg.contoller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PatchMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.cg.dao.UserRepository;
import com.cg.entites.User;
import com.cg.exceptions.InvalidException;
import com.cg.service.UserService;
#RestController
#RequestMapping("/api/v1")
public class UserController {
#Autowired
UserService service;
#Autowired
UserRepository urepo;
#GetMapping("/user")
public List<User> findUser(){
return urepo.findAll();
}
#PostMapping("/user")
public ResponseEntity<User> addUser(#RequestBody User user) throws InvalidException{
User u2=service.validateUser(user.getUsername(),user.getPassword());
System.out.println("Valid u2 "+u2);
if(u2.getUsername()==null && u2.getPassword()==null) {
User user1 = service.addUser(u2);
System.out.println("user successfully registered");
}
else {
System.out.println("add user method accessed");
throw new InvalidException("Invalid user in controller");
}
return null;
}
#DeleteMapping("/user/{id}")
public ResponseEntity<User> deleteUser(#PathVariable int id) {
User user1 = service.removeUser(id);
if(user1!=null) {
System.out.println("User successfully removed");
return new ResponseEntity<>(user1,HttpStatus.OK);
}
System.out.println("delete user method accessed");
//throw new UserNotFoundException("Invalid user id");
return null;
}
}
6.build.grdale
plugins {
id 'org.springframework.boot' version '2.4.5'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.cg'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-web'
runtimeOnly 'com.oracle.database.jdbc:ojdbc8'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
test {
useJUnitPlatform()
}
I don't know where the error is can someone help me.

As I can see from the stack trace, the problem is in the line before the last one of this piece of code
User u2=service.validateUser(user.getUsername(),user.getPassword());
System.out.println("Valid u2 "+u2);
if(u2.getUsername()==null && u2.getPassword()==null) {
User user1 = service.addUser(u2);
u2 is null.
This code is called from controller method addUser, so user probably doesn't exist.
u2 comes from validateUser method and it simply calls you repository method. Since user doesn't exist, the repository should return null.
As a conclude from your code, you thought, that repository should return a non null User object with all fields equal to null. Because that's when you decide to add user.
Please tell me if I was correct ))
It's really weird, that you add User with name == null and password == null by the way ))