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threw Exception: java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener or DispatcherServlet registered?

I am using Spring, Maven for this project, but I am facing this error continuously even after creating dispatcher servlet.
This is my code in ConfigFile:
package com.payroll.config;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
#Configuration
#ComponentScan(basePackages = {"com.payroll"})
#EnableWebMvc
public class PayrollConfig implements WebMvcConfigurer {
#Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/View/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry
.addResourceHandler("/URLToReach/**")
.addResourceLocations("/resources");
}
#Bean
public JdbcTemplate jdbcTemplate() {
JdbcTemplate jdbcTemplate= new JdbcTemplate(dataSource());
return jdbcTemplate;
}
#Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource=new DriverManagerDataSource();
dataSource.setUsername("system");
dataSource.setPassword("orcl");
dataSource.setUrl("jdbc:oracle:thin:#localhost:1521:orcl");
dataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
return dataSource;
}
}
When I launch my application I am getting this error:
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener or DispatcherServlet registered?
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

Facing Issue while implementing internationalization in Spring Boot Mvc

While accessing the url I am getting following exception.
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.UnsupportedOperationException: Cannot change HTTP accept header - use a different locale resolution strategy
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
org.springframework.boot.web.servlet.support.ErrorPageFilter.forwardToErrorPage(ErrorPageFilter.java:193)
org.springframework.boot.web.servlet.support.ErrorPageFilter.handleException(ErrorPageFilter.java:178)
org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:145)
org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66)
org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:103)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:121)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
Root Cause
java.lang.UnsupportedOperationException: Cannot change HTTP accept header - use a different locale resolution strategy
org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver.setLocale(AcceptHeaderLocaleResolver.java:142)
org.springframework.web.servlet.i18n.LocaleChangeInterceptor.preHandle(LocaleChangeInterceptor.java:154)
org.springframework.web.servlet.HandlerExecutionChain.applyPreHandle(HandlerExecutionChain.java:141)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1035)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
org.springframework.boot.web.servlet.support.ErrorPageFilter.forwardToErrorPage(ErrorPageFilter.java:193)
org.springframework.boot.web.servlet.support.ErrorPageFilter.handleException(ErrorPageFilter.java:178)
org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:145)
org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66)
org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:103)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:121)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
My Configuration Class looks as below :
package com.spring.mvc.messenger.config;
import java.util.Locale;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
#Configuration
public class MessengerConfig implements WebMvcConfigurer {
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/files/**").addResourceLocations("/WEB-INF/pdf/");
}
#Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(getLocaleChangeInterceptor());
}
#Bean
public LocaleChangeInterceptor getLocaleChangeInterceptor() {
LocaleChangeInterceptor localChangeInterceptor = new LocaleChangeInterceptor();
localChangeInterceptor.setParamName("lang");
return localChangeInterceptor;
}
#Bean
public ViewResolver getViewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/jsp/");
resolver.setSuffix(".jsp");
resolver.setOrder(0);
return resolver;
}
#Bean
public LocaleResolver getLocaleResolver() {
SessionLocaleResolver localeResolver = new SessionLocaleResolver();
localeResolver.setDefaultLocale(new Locale("en", "US"));
return localeResolver;
}
}
My message.properties file have following details:
#labels
name=Name
#button
save.changes=Save Changes
My message_es.properties file have following details:
#labels
name=Nombre
#button
save.changes=Guardar cambios
My Jsp files is
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Welcome Home Jsp</h1>
<spring:message code="name" />
</body>
</html>
My Controller Class
package com.spring.mvc.messenger.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
#Controller
#RequestMapping("/")
public class MessengerController {
#GetMapping
public ModelAndView getHomePage(Model model) {
return new ModelAndView("WelcomeHome");
}
#GetMapping(value = "/home")
public ModelAndView homePage(Model model) {
return new ModelAndView("WelcomeHome");
}
}
My ApplicationClass is
package com.spring.mvc.messenger;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
#SpringBootApplication
public class MessengerApplication extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(MessengerApplication.class, args);
}
}
Can anyone help me out with this.. I have tried using different locale . But still similar response is getting

Sometimes error can be about not adding annotation "#EnableWebMvc"

thymeleaf different behavior (via database and resttemplate)

everybody.
I have two application.
The first one is a CRUD spring boot JPA web mvc application.
it works fine with these code. (via repositories database)
#RequestMapping(value = { "/newUser" }, method = RequestMethod.GET)
public String newUser(ModelMap model) {
User user = new User();
List<UserProfile> roles = userProfileRepository.findAll();
model.addAttribute("user", user);
model.addAttribute("allRoles", roles);
return "registration";
}
#RequestMapping(value = { "/newUser" }, method = RequestMethod.POST)
public String saveUser(#Valid User user, BindingResult result,
ModelMap model) {
if (result.hasErrors()) {
List<UserProfile> roles = userProfileRepository.findAll();
model.addAttribute("allRoles", roles);
model.addAttribute("user", user);
return "registration";
}
userRepository.save(user);
return "registrationsuccess";
}
and a part of registration.html is
<select class="form-control input-sm" id="userProfiles" name="userProfiles" multiple="multiple" th:required="true">
<option th:each="role : ${allRoles}"
th:value="${{role}}"
th:text="${role.type}"
th:selected="${role.id == 1}"
>Role
</option>
</select>
the code above works fine.
The second application is a resttemplate based spring boot
#RequestMapping(value = { "/newUser" }, method = RequestMethod.GET)
public String newUser(ModelMap model) {
User user = new User();
RestTemplate restTemplate = new RestTemplate();
List<UserProfile> userProfiles = Arrays.asList(restTemplate.getForObject("http://localhost:8080/api/roles", UserProfile[].class));
ArrayList<UserProfile> roles = new ArrayList<>(userProfiles);
model.addAttribute("user", user);
model.addAttribute("allRoles", roles);
return "registration";
}
#RequestMapping(value = { "/newUser" }, method = RequestMethod.POST)
public String saveUser(#Valid User user, BindingResult result,
ModelMap model) {
if (result.hasErrors()) {
RestTemplate restTemplate = new RestTemplate();
List<UserProfile> userProfiles = Arrays.asList(restTemplate.getForObject("http://localhost:8080/api/roles", UserProfile[].class));
ArrayList<UserProfile> roles = new ArrayList<>(userProfiles);
model.addAttribute("allRoles", roles);
model.addAttribute("user", user);
return "registration";
}
RestTemplate restTemplate = new RestTemplate();
restTemplate.postForObject("http://localhost:8080/api/users", user, User.class);
return "registrationsuccess";
}
multiple select form is the same like first app has (identical)
But the second app throws exceptions when registration.html is called
There was an unexpected error (type=Internal Server Error, status=500).
An error happened during template parsing (template: "class path resource [templates/registration.html]")
org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/registration.html]")
at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241)
at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100)
at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362)
at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1371)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1117)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1056)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
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)
Caused by: org.attoparser.ParseException: Exception evaluating SpringEL expression: "role" (template: "registration" - line 60, col 37)
at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:393)
at org.attoparser.MarkupParser.parse(MarkupParser.java:257)
at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230)
... 52 more
Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "role" (template: "registration" - line 60, col 37)
at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:290)
at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109)
at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138)
at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144)
at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314)
at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205)
at org.thymeleaf.engine.Model.process(Model.java:282)
at org.thymeleaf.engine.Model.process(Model.java:290)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.processIterationModel(IteratedGatheringModelProcessable.java:367)
at org.thymeleaf.engine.IteratedGatheringModelProcessable.process(IteratedGatheringModelProcessable.java:221)
at org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement(ProcessorTemplateHandler.java:1640)
at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleCloseElementEnd(TemplateHandlerAdapterMarkupHandler.java:388)
at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleCloseElementEnd(InlinedOutputExpressionMarkupHandler.java:322)
at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleCloseElementEnd(OutputExpressionInlinePreProcessorHandler.java:220)
at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleCloseElementEnd(InlinedOutputExpressionMarkupHandler.java:164)
at org.attoparser.HtmlElement.handleCloseElementEnd(HtmlElement.java:169)
at org.attoparser.HtmlMarkupHandler.handleCloseElementEnd(HtmlMarkupHandler.java:412)
at org.attoparser.MarkupEventProcessorHandler.handleCloseElementEnd(MarkupEventProcessorHandler.java:473)
at org.attoparser.ParsingElementMarkupUtil.parseCloseElement(ParsingElementMarkupUtil.java:201)
at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:725)
at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)
... 54 more
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1001E: Type conversion problem, cannot convert from com.naranov.rest_client.model.UserProfile to java.lang.String
at org.springframework.expression.spel.support.StandardTypeConverter.convertValue(StandardTypeConverter.java:75)
at org.springframework.expression.common.ExpressionUtils.convertTypedValue(ExpressionUtils.java:57)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:367)
at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:277)
... 79 more
Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [com.naranov.rest_client.model.UserProfile] to type [java.lang.String]
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:321)
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:194)
at org.springframework.expression.spel.support.StandardTypeConverter.convertValue(StandardTypeConverter.java:70)
... 82 more
PS. I've tested all the methods (PUT, GET, DELETE and POST) via PostMan. And it works fine.
I don't understand the different behavior of thymeleaf..

Remove the double-bracket syntax from th:value="${{role}}" as described in the stacktrace.
The double brackets apply a conversion service, typically used for things like dates. This in the Data Conversion section of the docs.

I've just implemented org.springframework.core.convert.converter.Converter;
#Component
public class RoleToUserProfileConverter implements Converter<Object, UserProfile>{
#Autowired
UserProfileService userProfileService;
public UserProfile convert(Object element) {
Integer id = Integer.parseInt((String)element);
return userProfileService.findById(id);
}
}
and modified a little bit this form
<select class="form-control input-sm" id="userProfiles" name="userProfiles" multiple="multiple" th:required="true">
<option th:each="role : ${allRoles}"
th:value="${role.id}"
th:text="${role.type}"
th:selected="${role.id == 1}"
>Role
</option>
</select>
So now, thymeleaf transform value to object.
Thanks everybody!

Process HTML file using Thymeleaf in Web based Scopes of Spring and store the processed template as String

I am trying to render an HTML file using thymeleaf and keep the resultant HTML content in a String variable in web-based scopes of Spring so that i can use it later for sending email or converting the content to pdf. I have gone through the implementation given in this website but its giving me error which i couldn't figure out. I am using spring boot 1.5.12.RELEASE with thymeleaf 3.0.9 n thymeleaf dialect 2.2.2. Below is my implementation. Please help.
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;
#Controller
public class jataController {
#GetMapping(value = "/manual-thym")
#ResponseBody
public void justSample() {
Context context = new Context();
String filename = "templates/view/failure";
String html = renderHtml(filename, context);
System.out.println("template\n" + html);
}
private String renderHtml(String filename, Context context) {
ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode(TemplateMode.HTML);
templateResolver.setCacheable(false);
templateResolver.setOrder(1);
templateResolver.setCharacterEncoding("UTF-8");
TemplateEngine templateEngine = new TemplateEngine();
templateEngine.setTemplateResolver(templateResolver);
String html = templateEngine.process(filename, context);
return html;
}
}
And the StackTrace:
2018-04-19 12:26:43.742 ERROR 6375 --- [nio-9000-exec-9] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: ognl/PropertyAccessor] with root cause
java.lang.ClassNotFoundException: ognl.PropertyAccessor
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_162]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_162]
at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_162]
at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_162]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_162]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) ~[na:1.8.0_162]
at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[na:1.8.0_162]
at java.net.URLClassLoader$1.run(URLClassLoader.java:368) ~[na:1.8.0_162]
at java.net.URLClassLoader$1.run(URLClassLoader.java:362) ~[na:1.8.0_162]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_162]
at java.net.URLClassLoader.findClass(URLClassLoader.java:361) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_162]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_162]
at org.thymeleaf.standard.expression.OGNLVariableExpressionEvaluator.<init>(OGNLVariableExpressionEvaluator.java:83) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.standard.StandardDialect.getVariableExpressionEvaluator(StandardDialect.java:179) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.standard.StandardDialect.getExecutionAttributes(StandardDialect.java:393) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.DialectSetConfiguration.build(DialectSetConfiguration.java:263) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.EngineConfiguration.<init>(EngineConfiguration.java:123) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.TemplateEngine.initialize(TemplateEngine.java:336) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1079) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1059) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1048) ~[thymeleaf-3.0.9.RELEASE.jar:3.0.9.RELEASE]
at com.siqes.flight.controller.jataController.renderHtml(jataController.java:37) ~[classes/:na]
at com.siqes.flight.controller.jataController.justSample(jataController.java:19) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55) ~[spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:111) ~[spring-boot-actuator-1.5.12.RELEASE.jar:1.5.12.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106) ~[spring-boot-actuator-1.5.12.RELEASE.jar:1.5.12.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.16.RELEASE.jar:4.3.16.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:613) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.29.jar:8.5.29]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.29.jar:8.5.29]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_162]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_162]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.29.jar:8.5.29]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_162]

See update below
When you configure Thymeleaf you should define the template engine and the template resolver otherwise when you autowire defaults are used. If you create an instance every time it is not a good practice. Here a sample configuration:
#Configuration
#EnableWebMvc
public class ThymeleafConfiguration {
#Bean
public SpringTemplateEngine templateEngine() {
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(thymeleafTemplateResolver());
return templateEngine;
}
#Bean
public SpringResourceTemplateResolver thymeleafTemplateResolver() {
SpringResourceTemplateResolver templateResolver
= new SpringResourceTemplateResolver();
templateResolver.setPrefix("/WEB-INF/views/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode("HTML5");
return templateResolver;
}
}
Then if you want to experiment programmatically you can autowire them but the usual flow for serving html pages with thymeleaf is to define the view resolver as well:
#Bean
public ThymeleafViewResolver thymeleafViewResolver() {
ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
viewResolver.setTemplateEngine(templateEngine());
return viewResolver;
}
With all that in place you can write a controller as:
#Controller
public class MyController {
#RequestMapping(value = "/test", method = RequestMethod.GET)
public String test() {
return "yourTemplateName";
}
}
Parameters can be passed to the template by using model attributes.
UPDATE 31/07/2018
unfortunately I do not have the time to complete working proof of concept, however I think the below code is enough to show the flow. If you run it and call localhost:8080/test you should be able to see the output html in the console. The pdf generation can be added as a view resolver and/or invoked programmatically, in this example using xhtmlrenderer; I do not have the time to complete it so I commented it out but you can get the point: a service provide the html and pdf generation by autowiring the template engine.
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.github.paizo</groupId>
<artifactId>html2pdf</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>html2pdf</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.xhtmlrenderer</groupId>
<artifactId>flying-saucer-pdf</artifactId>
<version>9.1.14</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
ThymeleafConfiguration.java
#Configuration
public class ThymeleafConfiguration {
#Bean
public SpringTemplateEngine templateEngine() {
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(thymeleafTemplateResolver());
return templateEngine;
}
#Bean
public ClassLoaderTemplateResolver thymeleafTemplateResolver() {
ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
templateResolver.setPrefix("templates/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode("HTML5");
return templateResolver;
}
}
HelloWorldController.java
#Controller
public class HelloWorldController {
#Autowired
private Html2PdfService pdfService;
#GetMapping(path = "/test")
public String hello() {
Map parameters = new HashMap();
parameters.put("name", "Borat");
System.out.println(pdfService.template2Html("test", parameters));
return "test";
}
// #ResponseBody
// #GetMapping
// public ResponseEntity helloPdf() {
// Map parameters = new HashMap();
// parameters.put("name", "Borat");
// pdfService.template2Pdf("test", parameters);
// String filePath = "PATH_HERE";
// InputStream inputStream = new FileInputStream(new File(filePath));
// InputStreamResource inputStreamResource = new InputStreamResource(inputStream);
// HttpHeaders headers = new HttpHeaders();
// headers.setContentLength();
// return new ResponseEntity(inputStreamResource, headers, HttpStatus.OK);
// }
}
Html2PdfService.java
#Service
public class Html2PdfService {
#Autowired
private TemplateEngine templateEngine;
public OutputStream template2Pdf(String templateName, Map parameters) {
// OutputStream outputStream = new BufferedOutputStream();
// IOUtils.copy()
//
// Context ctx = new Context();
// String processedHtml = templateEngine.process(templateName, ctx);
// ITextRenderer renderer = new ITextRenderer();
// renderer.setDocumentFromString(processedHtml);
// renderer.layout();
// renderer.createPDF(os, false);
// renderer.finishPDF();
return null;
}
public String template2Html(String templateName, Map parameters) {
Context ctx = new Context();
ctx.setVariable("name", "pippo");
String processedHtml = templateEngine.process(templateName, ctx);
return processedHtml;
}
}
Html2pdfApplication.java
#SpringBootApplication
public class Html2pdfApplication {
public static void main(String[] args) {
SpringApplication.run(Html2pdfApplication.class, args);
}
}
as a side note if you plan to generate the pdf on the fly and serve it as response in the controller I suggest to use streams and not byte arrays or temp files.

If TemplateEngine is autowired inside a singleton bean, then the below mentioned code works perfect.
#Controller
public class jataController {
#Autowired
private TemplateEngine templateEngine;
#GetMapping(value = "/manual-thym")
#ResponseBody
public void justSample() {
Context context = new Context();
String filename = "templates/view/generated-ticket.html";
String html = renderHtml(filename, context);
System.out.println("template\n" + html);
}
private String renderHtml(String filename, Context context) {
ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode(TemplateMode.HTML);
templateResolver.setCacheable(false);
templateResolver.setOrder(1);
templateResolver.setCharacterEncoding("UTF-8");
templateEngine.setTemplateResolver(templateResolver);
String html = templateEngine.process(filename, context);
return html;
}
}
but if TemplateEngine is autowired on a request scope bean type, it gives exception and thymeleaf will create a memory leak. So finally with lots of hit and tries, i got a working solution and thanks to #Paizo. It might contain some bad practice but this is how it worked:
#Controller
#Configuration
#EnableWebMvc
#ApplicationScope
public class MyThymeleafConfig {
#GetMapping("/view-template")
#ResponseBody
public void viewTemplates() {
Context context = new Context();
context.setVariable("mydata", "this is it");
String html = templateEngine().process("templates/view-to-process.html", context);
System.out.println(html);
}
/*
configuration for thymeleaf and template processing
*/
#Bean
public SpringTemplateEngine templateEngine() {
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(thymeleafTemplateResolver());
return templateEngine;
}
#Bean
public SpringResourceTemplateResolver thymeleafTemplateResolver() {
SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
templateResolver.setPrefix("classpath:");
templateResolver.setSuffix(".html");
templateResolver.setCacheable(false);
templateResolver.setTemplateMode(TemplateMode.HTML);
return templateResolver;
}
#Bean
public ThymeleafViewResolver thymeleafViewResolver() {
ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
viewResolver.setTemplateEngine(templateEngine());
return viewResolver;
}
}
and to serve the static resources we need to define another bean, which is as follows:
#Configuration
#EnableWebMvc
public class StaticResourceConfig implements WebMvcConfigurer {
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry
.addResourceHandler("/**")
.addResourceLocations("/static/", "classpath:static/");
}
}
This solution cannot be found on any forum. However i would ask as well as request any Spring developer to provide a better implementation for the above code.

I'm using similar Springboot and Thymeleaf versions and something like this worked for me on a few projects :
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
#Component
public class EmailProcessor {
private TemplateEngine htmlTemplateEngine;
#Autowired
public EmailProcessor(TemplateEngine templateEngine) {
this.htmlTemplateEngine = templateEngine;
}
public String process(User user) {
final Context ctx = new Context();
if (user != null) {
ctx.setVariable("user", user);
}
return htmlTemplateEngine.process("emails/template", ctx);
}
}
Email template is just a regular Thymeleaf template which is located in:
resouces/templates/emails/template.html

Using Maven, add ognl dependency to your pom.xml file, e.g. (find the latest dependency/version in MVNRepository):
<dependency>
<groupId>ognl</groupId>
<artifactId>ognl</artifactId>
<version>3.1.12</version>
</dependency>

In my case, my html template was not in right directory. Changed that to "src/main/resources/abc.html" and this fixed my error:
java.lang.ClassNotFoundException: ognl.PropertyAccessor

In Springmvc and Thymeleaf, getting "Cannot initialize template resolver: a resource resolver has not been set]" error

I will show some mistakes next, but first I will explain it. According to some of my output, creating ViewResolver, SpringTemplateEngine, TemplateResolver bean is no problem, and then found the home page, view name is "home", here is no problem.
And then, according the thymeleaf template, I'll get the path "/WEB-INF/templates/home.html" . But it's wrong here. The following error occurred
Servlet.service() for servlet [dispatcher] in context with path [/Spittr] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.ConfigurationException: Cannot initialize template resolver: a resource resolver has not been set] with root cause
org.thymeleaf.exceptions.ConfigurationException: Cannot initialize template resolver: a resource resolver has not been set
at org.thymeleaf.templateresolver.TemplateResolver.initializeSpecific(TemplateResolver.java:136)
at org.thymeleaf.templateresolver.AbstractTemplateResolver.initialize(AbstractTemplateResolver.java:106)
at org.thymeleaf.Configuration.initialize(Configuration.java:200)
at org.thymeleaf.TemplateEngine.initialize(TemplateEngine.java:831)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1122)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1095)
at org.thymeleaf.spring3.view.ThymeleafView.renderFragment(ThymeleafView.java:259)
at org.thymeleaf.spring3.view.ThymeleafView.render(ThymeleafView.java:179)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1100)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2508)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2497)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
I do not know what it means, and check a lot but do not know how to solve. I will show some bean:
#Bean
public ViewResolver viewResolver(SpringTemplateEngine templateEngine){
ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
viewResolver.setTemplateEngine(templateEngine);
System.out.println("create:viewResolver");
return viewResolver;
}
#Bean
public SpringTemplateEngine templateEngine(TemplateResolver templateResolver){
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(templateResolver);
System.out.println("create:templateEngine");
return templateEngine;
}
#Bean
public TemplateResolver templateResolver(){
TemplateResolver templateResolver = new TemplateResolver();
templateResolver.setPrefix("/WEB-INF/templates/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode("HTML5");
System.out.println("create:templateResolver");
return templateResolver;
}
Following is my controller
#RequestMapping("/")
public class HomeController {
#RequestMapping(method=GET)
public String home(){
System.out.println("control:home");
return "home"; //view name：home
}
}}
Please help me look at the above questions.

According to the error you provide, no resolver is set on the templateEngine. Do not pass in the templateResolver as argument but just create new instance inside the Bean method like below:
#Bean
public ViewResolver viewResolver(){
ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
viewResolver.setTemplateEngine(templateEngine());
System.out.println("create:viewResolver");
return viewResolver;
}
#Bean
public SpringTemplateEngine templateEngine(){
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(templateResolver());
System.out.println("create:templateEngine");
return templateEngine;
}
#Bean
public TemplateResolver templateResolver(){
TemplateResolver templateResolver = new ClassLoaderTemplateResolver();
templateResolver.setPrefix("/WEB-INF/templates/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode("HTML5");
System.out.println("create:templateResolver");
return templateResolver;
}
Good luck.

You can change
#Bean
public TemplateResolver templateResolver(){
TemplateResolver templateResolver = new TemplateResolver(); // This line
templateResolver.setPrefix("/WEB-INF/templates/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode("HTML5");
System.out.println("create:templateResolver");
return templateResolver;
}
to
#Bean
public TemplateResolver templateResolver() {
TemplateResolver templateResolver = new ServletContextTemplateResolver();
templateResolver.setPrefix("/WEB-INF/templates/");
templateResolver.setSuffix(".html");
templateResolver.setTemplateMode("HTML5");
System.out.println("create:templateResolver");
return templateResolver;
}