OutOfMemory. Hibernate

HiberBoy · **Joined:** Fri Mar 07, 2008 5:32 pm **Posts:** 6

Hibernate version: Last one

Code between sessionFactory.openSession() and session.close():

Code:

   public static Object createSession() throws Exception {
      Session session = (Session) currentSession.get();
      Owner id = null;
      System.out.println(session);
      if (session == null) {
         System.out.println("No Session Found - Create and give the identity");
         session = getSessionFactory().openSession();
         currentSession.set(session);
         id = trueOwner;
      } else {
         System.out.println("Session Found - Give a Fake identity");
         id = fakeOwner;
      }
      sessions.add(session);
      return id;
   }

Code:

   public static void closeSession(Object ownership) throws Exception {
      if (((Owner) ownership).identity) {
         System.out.println("Identity is accepted. Now closing the session");
         Session session = (Session) currentSession.get();
         session.flush();
         session.clear();
         session.close();
         currentSession.set(null);
      } else {
         System.out.println("Identity is rejected. Ignoring the request");
      }
   }

Full stack trace of any exception that occurs:
OutOfMemory

Name and version of the database you are using:
Oracle 9

OK, after fighting against an OutOfMemory exception all the weekend, I come to you, experts to help me with my case, I have tried a lot of things but no success, after using JProbe I could do the follow test:
1. Stress test for 10 minutes (Using SOAPUI, yes, I'm developing a WebService)
2. I invoke a Garbage Collector and take a snapshot of current loaded classes

The result, sorting by memory usage is:

Code:

Package                     Class        Count             Memory
                            char [ ]  68,278 (13.6%)       22,685,896 (66.2%)
java.lang                   String [ ]  157,285 (31.3%)    2,663,576 (7.8%) 
java.lang                   String  69,132 (13.7%)         1,659,168 (4.8%) 
org.hibernate.loader.entity EntityLoader  9,750 (1.9%)     858,000 (2.5%)
java.util                   HashMap$Entry  32,316 (6.4%)   775,584 (2.3%) 
java.util                   HashMap$Entry [ ]  7,535 (1.5%) 718,128 (2.1%)
java.lang                   String [ ] [ ]  12,240 (2.4%)  635,760 (1.9%) 
java.lang.reflect           Method  6,798 (1.4%)           543,840 (1.6%) 
org.hibernate.loader        DefaultEntityAliases  10,200 (2.0%)  408,000 (1.2%)
java.util                   HashMap  7,535 (1.5%)          301,400 (0.9%) 
                            int [ ]  6,778 (1.3%)          183,112 (0.5%) 
                            boolean [ ]  9,210 (1.8%)      177,000 (0.5%)
org.hibernate.persister.entity  Loadable [ ]  10,200 (2.0%)  163,200 (0.5%)

OK, I believe that the first classes are being used by the next one, in this case I could check that EntityLoader Class is not being collected by GC.

Could someone help me to ensure that all my hibernate objects are being closed, so, I believe that I could fix this OutOfMemory error.

Thanks in advance.

HiberBoy · **Joined:** Fri Mar 07, 2008 5:32 pm **Posts:** 6

I've found the memory leak tracing hibernate class, my webservice was loading everytime the method:

sessionFactory = new Configuration().configure().buildSessionFactory();

Now everything is ok.
cya

Cameron McKenzie · **Posted:** Wed May 21, 2008 9:51 am

Ouch! You don't want to be making that call every time, that's for sure!

Glad you solved your problem, and thanks for reporting back.

-Cameron McKenzie