Getting "cannot proxy initialize - no session" even though I use @Transactional annotation

I am using Spring 3.1.1.RELEASE and Hibernate 4.1.0.Final. I get the exception "do not initialize proxies - no session", despite the fact that I end the corresponding method call in the @Transactional annotation. Here is my method ...

@Service("teacherImportService") public class TeacherImportServiceImpl extends AbstractmyprojectService { … @Transactional @Override public void saveUserObject(final JsonObject jsonData) { … final myprojectOrganization myprojectOrg = myprojectOrgDao.findBymyprojectOrgId(myprojectSchoolId); final Organization school = myprojectOrg != null ? myprojectOrg.getOrg() : null; … final Address address = new Address(); address.setState(school.getState()); // error occurs here 

What else do I need to do to guarantee the transaction? I have included "<tx: annotation-driven />" in my application context, which I include below

 <context:component-scan base-package="org.mainco.subco" /> ... <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${test.mysql.dataSource.driverClassName}" /> <property name="url" value="${test.mysql.dataSource.url}" /> <property name="username" value="${test.mysql.db.user}" /> <property name="password" value="${test.mysql.db.password}" /> </bean> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="packagesToScan" value="org.mainco.subco" /> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/> </property> <property name="dataSource" ref="dataSource"/> <property name="jpaPropertyMap" ref="jpaPropertyMap" /> </bean> <util:map id="jpaPropertyMap"> <entry key="hibernate.show_sql" value="true" /> <entry key="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <entry key="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"/> <entry key="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider"/> <entry key="hibernate.cache.use_second_level_cache" value="true" /> <entry key="hibernate.cache.use_query_cache" value="false" /> <entry key="hibernate.generate_statistics" value="true" /> </util:map> <bean id="sharedEntityManager" class="org.springframework.orm.jpa.support.SharedEntityManagerBean"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <tx:annotation-driven /> <jdbc:initialize-database data-source="dataSource"> <jdbc:script location="classpath:truncate_tables.sql" /> <jdbc:script location="classpath:db-test-data.sql" /> </jdbc:initialize-database> 

Here is a complete trace of the exception stack ...

 org.hibernate.LazyInitializationException: could not initialize proxy - no Session at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:149) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:195) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185) at org.mainco.subco.organization.domain.Organization_$$_javassist_30.getState(Organization_$$_javassist_30.java) at org.mainco.subco.myproject.service.TeacherImportServiceImpl.saveUserObject(TeacherImportServiceImpl.java:101) at org.mainco.subco.myproject.service.AbstractmyprojectService.saveUsers(AbstractmyprojectService.java:226) at org.mainco.subco.myproject.service.AbstractmyprojectService$$FastClassByCGLIB$$d080e416.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:618) at org.mainco.subco.myproject.service.TeacherImportServiceImpl$$EnhancerByCGLIB$$a06c7e9f.saveUsers(<generated>) at org.mainco.subco.myproject.service.TeacherImportServiceTest.testSaveTeachers(TeacherImportServiceTest.java:46) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 
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3 answers

You may have forgotten to add the transactional annotation to AbstractmyprojectService.saveUsers()

Note that internal calls are never proxied, so the thread:

  TeacherImportServiceTest.testSaveTeachers() -> AbstractmyprojectService.saveUsers() -> TeacherImportServiceImpl.saveUserObject() 

It will not be transactional if AbstractmyprojectService.saveUsers() not transactional.

EDIT

After reading your comments, I see three options for solving it:

  • Extract the saveUsers() method to the saveUsers() class .

Really simple, reorganize your code to support Tx methods in one class and use it from another using composition.

  • Use programmatic transactions in saveUserObject() .

for example, enter txManager and

 public void saveUserObject() { DefaultTransactionDefinition def = new DefaultTransactionDefinition(); def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW); TransactionStatus status = txManager.getTransaction(def); try { // the code } catch (Exception ex) { txManager.rollback(status); throw ex; } txManager.commit(status); } 
  • Use AspectJ instead of Spring AOP. (I think this option is too complicated just for this problem.)

Using AspectJ, you replace AOP Proxies with Aspect AnnotationTransactionAspect

use <tx:annotation-driven mode="aspectj"/> and select the weaving method (compile or load time).

for weaving boot time, see http://static.springsource.org/spring/docs/3.0.5.RELEASE/reference/aop.html#aop-aj-ltw

for compilation time with maven, see Spring / @ Transactional with AspectJ completely ignored

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In your XML application context, I don't see a component scan configuration that would allow Spring to control annotated bean types of stereo classes (that is, classes annotated with @Service , @Repository or @Component ]

Just add a packet scan for any of these classes, as shown below:

 <context:component-scan base-package="some.package.where.stereotypedclassesexist"/> 

Regarding checking the class path for Spring managed components, Spring Documentation link here .

NTN.

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This may be due to the proxy implementation pattern . Try extracting saveUserObject to the interface:

 public class TeacherImportServiceImpl extends AbstractmyprojectService implements SomeInterface { @Transactional @Override public void saveUserObject(final JsonObject jsonData) { ... } } public interface SomeInterface { void saveUserObject(JsonObject jsonData); } 

You can also try class-based proxies with CGLIB:

 <tx:annotation-driven proxy-target-class="true" /> 
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