I use spring 4.3.9.RELEASE
Some configs and code:
#Configuration
#EnableTransactionManagement
public class PersistenceContext {
#Autowired
private DbConfiguration dbConfiguration;
#Bean(destroyMethod = "close")
public DataSource dataSource() {
final BoneCPDataSource dataSource = new BoneCPDataSource();
dataSource.setDriverClass(dbConfiguration.getDriverClassName());
dataSource.setJdbcUrl(dbConfiguration.getUrl());
dataSource.setUsername(dbConfiguration.getUsername());
dataSource.setPassword(dbConfiguration.getPassword());
dataSource.setIdleConnectionTestPeriodInMinutes(dbConfiguration.getIdleConnectionTestPeriod());
dataSource.setIdleMaxAgeInMinutes(dbConfiguration.getIdleMaxAgeInMinutes());
dataSource.setMaxConnectionsPerPartition(dbConfiguration.getMaxConnectionsPerPartition());
dataSource.setMinConnectionsPerPartition(dbConfiguration.getMinConnectionsPerPartition());
dataSource.setPartitionCount(dbConfiguration.getPartitionCount());
dataSource.setAcquireIncrement(dbConfiguration.getAcquireIncrement());
dataSource.setStatementsCacheSize(dbConfiguration.getStatementsCacheSize());
return dataSource;
}
#Bean(name = "txManager")
public DataSourceTransactionManager transactionManager() {
return new DataSourceTransactionManager(dataSource());
}
}
servlet:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<context:annotation-config/>
<context:component-scan base-package="ru.org.*"/>
<tx:annotation-driven transaction-manager="txManager" />
<mvc:annotation-driven />
</beans>
WebConfig:
#Configuration
#EnableScheduling
#EnableWebMvc
#ComponentScan({"ru.org.*"})
#EnableTransactionManagement
public class WebConfig extends WebMvcConfigurerAdapter {
#Bean
public MainHandler mainHandler() {
return new MainHandler();
}
}
handler:
public class MainHandler extends AbstractUrlHandlerMapping {
#Autowired
private DataSource dataSource;
protected Object getHandlerInternal(final HttpServletRequest request) throws Exception {
transactionalTest();
}
#Transactional(transactionManager = "txManager")
private void transactionalTest() {
final JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.execute("INSERT INTO marks(score) VALUES (1);");
jdbcTemplate.execute("IN3ERT INTO marks(score) VALUES (1);");
}
}
It throws an exception but no rollback happened.
Also I tried to use rollbackFor-param and throws exactly that exception.
Any ideas?
There are two major rules of #Transaction annotation you must keep in mind
#Transaction will work if the annotated method is not declared in
the same class that invokes it (True for default Spring Proxy AOP).
#Transaction will work if annotated on a public method. It will always
be ignored if the method is private, protected or package-visible.
So what you should do
Delcare a public transactionalTest() method in a #Service annotated class and then call it in MainHandler class
Related
I have tennisCoach object created by Spring framework:
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml") ;
Coach theCoach = context.getBean("tennisCoach", Coach.class);
Can't understand why I need #Autowired annotation in TennisCoach constructor in code below. It works fine with and without #Autowired annotation.
#Component
public class TennisCoach implements Coach {
private FortuneService fortuneService;
#Autowired
public TennisCoach(FortuneService theFortuneService) {
fortuneService = theFortuneService;
}
#Override
public String getDailyWorkout() {
return "Practice your backhand volley";
}
#Override
public String getDailyFortune() {
return fortuneService.getFortune();
}
}
UPD
Content of applicationContext.xml :
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.luv2code.springdemo"></context:component-scan>
</beans>
From #Autowired Javadoc:
If a class only declares a single constructor to begin with, it will always be used, even if not annotated.
Since Spring 4.3 you don’t need the #Autowired annotation as soon as you have the only constructor in your class.
Here #Autowired is used for constructor injection. TennisCoach has a dependency on FortuneService and it is injected through constructor. I'm not sure how you have configured beans in applicationContext.xml
I'm learning about spring data and because I'm also learning about kotlin so I decided to work with kotlin during spring learning. So I want to ask how we can Implement setter dependency injection in kotlin? as in Java we can that as below.
#Component
public class StudentDaoImp {
public DataSource dataSource;
public JdbcTemplate jdbcTemplate;
public DataSource getDataSource() {
return dataSource;
}
#Autowired
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
public JdbcTemplate getJdbcTemplate() {
return jdbcTemplate;
}
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
}
And here is my spring.xml file.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.h2.Driver" />
<property name="url" value="jdbc:h2:~/test" />
</bean>
<context:component-scan base-package="com.package.*" />
</beans>
Then I tried it in kotlin.
#Component
class StudentDao {
#Autowired
lateinit var dataSource: DataSource
var jt = JdbcTemplate(dataSource)
}
Then I'm getting the exception.
Caused by: kotlin.UninitializedPropertyAccessException: lateinit
property dataSource has not been initialized
I know about this exception because I'm using dataSource before autowired happen. So I have also tried this.
#Autowired
fun setDataSource(dataSource: DataSource) {
this.jt = JdbcTemplate(dataSource)
}
This is also an error, because JVM already have that signature behind the scene.
So how I can Initialize JdbcTemplate with the dataSourceparameter?
Note: I only want Code side example/solution. I know about the XML solution.
like in Java you can't use properties that are injected after instantiation at instantiation time. In Java you'd get a NullPointerException when you would do the equivalent, e.g.
#Autowired
private Datasource datasource;
private JdbcTemplate jt = new JdbcTemplace(dataSource);
But you can let Spring call a method of your choice after it has injected everything:
lateinit var jt: JdbcTemplate
#PostConstruct
fun initAfterAutowireIsDone() {
jt = JdbcTemplate(dataSource)
}
There is also the InitializingBean interface that can be used instead of the annotation. The same works in Java.
The other option you have in Kotlin is to use a lazy property when you ensure you don't access it at instantiation time.
val jt: JdbcTemplate by lazy { JdbcTemplate(dataSource) }
While I consider zapl answer correct, I would also suggest you to consider constructor arguments injection:
#Component
class StudentDao #Autowired constructor(
private val dataSource: DataSource
) {
private val jt = JdbcTemplate(dataSource)
}
In this way you can obtain non modifiable variables without warning about late initialization.
Also, if you need dataSource variable only to initialize jt, you can remove val key from constructor.
I'm try to define a custome annotation include #Configuration and #ImportResource
but #ImportResource doesn't work
Any suggestions?
#Documented
#Configuration
#ImportResource
#Target({ElementType.TYPE})
#Order(Ordered.HIGHEST_PRECEDENCE)
#Retention(RetentionPolicy.RUNTIME)
public #interface EnableXXConfiguration {
#AliasFor(annotation = ImportResource.class , attribute = "value")
String[] value() default {};
}
#ImportResource contains two attributes value and locations. The value attribute is ultimately alias for locations attribute so using either of the aliases works fine. Keeping your Custom annotation(EnableXXConfiguration) declaration (the one using value attribute) as it, use below code snippet.
#EnableXXConfiguration(value = { "context1.xml", "com/example/stackoverflow/context2.xml"})
public class DemoApp {
#Autowired
private BeanA beanA;
#Autowired
private BeanB beanB;
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DemoApp.class);
DemoApp demoAppObj = (DemoApp) context.getBean("demoApp");
System.out.println("BeanA member: " + demoAppObj.getBeanA());
System.out.println("BeanB member: " + demoAppObj.getBeanB());
}
public BeanA getBeanA() {
return beanA;
}
public BeanB getBeanB() {
return beanB;
}
}
Assume we are using two xmlss placed at two different locations. context1.xml is placed in resource folder(src/main/resource) and context2.xml is placed at any other location (here at: src/main/java/com/example/stackoverflow)
context1.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="beanA" class="com.example.stackoverflow.BeanA" />
</beans>
context2.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="beanB" class="com.example.stackoverflow.BeanB" />
</beans>
My application uses struts and spring frameworks. I have a class FormA which has an autowired property in it. When I try to instantiate it while writing unit tests I get a Null Pointer Exception. Here is my code.
My ClassA:
public class FormA{
private String propertyOne;
#Autowired
private ServiceClass service;
public FormA(){
}
}
My unit test method:
#Test
public void testFormA(){
FormA classObj = new FormA();
}
#Autowired only works when object life cycle is managed by Spring.
You'll need to run your tests with #RunWith(SpringJUnit4ClassRunner.class), and instead of instantiating FormA manually, inject it in the test class as well, using #Autowired.
When you create an object by new, autowire\inject don't work...
as workaround you can try this:
create your template bean of NotesPanel
<bean id="notesPanel" class="..." scope="prototype">
<!-- collaborators and configuration for this bean go here -->
</bean>
and create an istance in this way
applicationContext.getBean("notesPanel");
PROTOTYPE : This scopes a single bean definition to have any number of object instances.
anyway a unit test should be
Test class
#RunWith( SpringJUnit4ClassRunner.class )
#ContextConfiguration(locations = { "classpath:META-INF/your-spring-context.xml" })
public class UserServiceTest extends AbstractJUnit4SpringContextTests {
#Autowired
private UserService userService;
#Test
public void testName() throws Exception {
List<UserEntity> userEntities = userService.getAllUsers();
Assert.assertNotNull(userEntities);
}
}
your-spring-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="userService" class="java.package.UserServiceImpl"/>
</beans>
I have trouble with #Autowired annotation
autoWiredLocallyTest() passes
autoWireAtClassTest() failed
Here is my test cases:
/**
* Spring Autowired test.
*/
#ContextConfiguration(locations = {"classpath:applicationContext.xml"})
#RunWith(SpringJUnit4ClassRunner.class)
public class AutowiredTest {
#Autowired
private ActionBeans localBeans;
#Test
public void autoWiredLocallyTest(){
//pre-test
Assert.assertNotNull(localBeans);
}
#Test
public void autoWireAtClassTest(){
TestClazz t = new TestClazz();
boolean isAutoWiredFromClass = t.isAutowired();
Assert.assertTrue(isAutoWiredFromClass);
}
}
TestClazz is:
public class TestClazz {
#Autowired
#Qualifier("actions")
private ActionBeans tempowieBiny;
public boolean isAutowired(){
return(this.tempowieBiny!=null);
}
}
applicationContext.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="actions.xml" />
<import resource="datasources.xml" />
</beans>
actions.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id='actions' class="net.virtalab.jsonio.configuration.actions.ActionBeans" scope="singleton">
<qualifier value="actions" />
</bean>
</beans>
What was made wrong or not done, but required to do?
I using Spring 3.2.5-RELEASE.
You are instantiating TestClazz using the new operator (TestClazz t = new TestClazz();). You need to load it from your spring context if you want the #autowired beans to be properly initialised.
Try:
#Autowired
ApplicationContext testContext;
#Test
public void autoWireAtClassTest(){
// TestClazz t = new TestClazz();
TestClazz t = (TestClazz)testContext.getBean(TestClazz.class);
boolean isAutoWiredFromClass = t.isAutowired();
Assert.assertTrue(isAutoWiredFromClass);
}
The problem here is that you're creating new TestClazz object every time. Autowire it instead:
#ContextConfiguration(locations = {"classpath:applicationContext.xml"})
#RunWith(SpringJUnit4ClassRunner.class)
public class AutowiredTest {
#Autowired
private ActionBeans localBeans;
// Added here
#Autowired
private TestClazz t;
#Test
public void autoWiredLocallyTest(){
//pre-test
Assert.assertNotNull(localBeans);
}
#Test
public void autoWireAtClassTest(){
//TestClazz t = new TestClazz(); COMMENTED OUT
boolean isAutoWiredFromClass = t.isAutowired();
Assert.assertTrue(isAutoWiredFromClass);
}
}