I have a JUnit test class that is attempting to test some JPA
datastore "create" operations, and I'm getting results that *seem* to
indicate a memory leak in the EntityManagerFactory (?) Basically, if
I use "test1a" (see below), the heap in use by the JUnit test process
continually increases until the JUnit test fails with an OutOfMemory
error. Test1b suffers from no such problem.
I would not expect this type of behavior from test1a because even
though I'm creating a new EntityManager upon every for-loop iteration,
that "em" should go away after every for-loop iteration since the
variable reference is replaced with a new EntityManager each time.
Now, one might argue that my test is just going too fast, and the GC
isn't getting a chance to Garbage Collect. However, Test1a takes a
pretty long time to execute on my machine (> 120 seconds), so I
*should* be getting some GC, right? Unless the EntityManagerFactory
is holding onto a reference to each created EntityManager?
Any input here would be much appreciated...
Thanks!
david
ps - my "UserImpl" is a standard JPA entity.
///////////////////////////////
//Begin JUnit Test #1a
///////////////////////////////
User user = null;
EntityManager em = null;
for (int i = 0; i < 5000; i++)
{
//See how I get an em here:
http://code.google.com/appengine/docs/java/datastore/usingjpa.html#Getting_an_EntityManager_Instance
em = EMF.get().createEntityManager();
user = new UserImpl("test" + i);
em.persist(user);
em.close();
}
///////////////////////////////
//End Test #1b
///////////////////////////////
///////////////////////////////
//Begin JUnit Test #1b
///////////////////////////////
User user = null;
EntityManager em = EMF.get().createEntityManager();
for(int i = 0; i < 5000; i++)
{
user = new UserImpl("test" + i);
em.persist(user);
}
em.close();
///////////////////////////////
//End Test #1b
///////////////////////////////
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