Spring3 / Hibernate3 / TestNG: some tests give LazyInitializationException, some don't

Question

Preface: I am struggling with LazyInitializationException in my unit tests, and it’s really hard for me to catch my head, as you can see from my questions Database sessions in Spring , TestNG and Spring 3 and LazyInitializationException when unit testing Hibernate entity classes for use in Spring using TestNG

So that I can clearly ask my question, I made an example project on GitHub: http://github.com/niklassaers/Sample-Spring3-App/ In this example project, I reproduce the problems that I encounter in Spring3 / Hibernate3 / TestNG projects .

Question: I have two unit tests, they are quite similar, test the same class for the same set of elements using the same service. One runs, one fails. Why unsuccessful failure? (or, why does one failure not work in the same way?)

Here is a failed test:

@Test(timeOut=1000)
public void Roles() {
    User mockUser = userService.read(1);
    Assert.assertNotNull(mockUser);
    Assert.assertTrue(mockUser.isValid());
    Set<Role> roles = mockUser.getRoles();
    int size = roles.size();  // This line gives a LazyInitializationException
    Assert.assertTrue(size > 0);
}

full code at ( http://github.com/niklassaers/Sample-Spring3-App/blob/master/src/tld/mydomain/sample/entities/test/FailingUserUnitTest.java )

and here is the current testing:

@Test
public void Roles() {
    for(int i = 1; i <= 4; i++) {
        User user = userService.read(i);
        Assert.assertNotNull(user);
        Assert.assertTrue(user.isValid());
        Set<Role> roles = user.getRoles();
        Assert.assertTrue(roles.size() > 0); // This line does not give a LazyInitializationException
        for(Role r : roles) {
            Assert.assertNotNull(r.getName());
            for(User someUser : r.getUsers())
                Assert.assertNotNull(someUser.getName());
        }
    }
}

full code at ( http://github.com/niklassaers/Sample-Spring3-App/blob/master/src/tld/mydomain/sample/entities/test/UserUnitTest.java )

. , , TransactionProxyFactoryBean (. http://github.com/niklassaers/Sample-Spring3-App/blob/master/WebRoot/WEB-INF/App-Model.xml), , , , . , "" OpenSessionInViewInterceptor. , unit test, @Test , AbstractTransactionalTestNGSpringContextTests, , . , , . ?

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[Parser] Running:
  /Users/niklas/Documents/Eclipse/SampleProject/testng.xml

2009-10-15 10:16:16,066 [TestNGInvoker-Roles()] ERROR org.hibernate.LazyInitializationException - failed to lazily initialize a collection of role: tld.mydomain.sample.entities.User.roles, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: tld.mydomain.sample.entities.User.roles, no session or session was closed
    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:380)
    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:372)
    at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:119)
    at org.hibernate.collection.PersistentSet.size(PersistentSet.java:162)
    at tld.mydomain.sample.entities.test.FailingUserUnitTest.Roles(FailingUserUnitTest.java:33)
    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.testng.internal.MethodHelper.invokeMethod(MethodHelper.java:607)
    at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:49)
    at org.testng.internal.InvokeMethodRunnable.run(InvokeMethodRunnable.java:40)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:637)

===============================================
SampleAppSuite
Total tests run: 3, Failures: 1, Skips: 0
===============================================

Answer 1

timeOut = 1000 @Test. , ( stacktrace, ThreadPool). SessionFactory , , .

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