The Hibernate classes and the ClassLoader which loads them are not GCed.
The following example has two classes, "CallJunk" creates a ClassLoader , loads
Junk and hibernate classes, and call Junk.main(). Junk.main() opens a session
and closes it.
The CallJunk program grows 1-2 MB in each loop step and finally run out of
memory.
I profiled with JProfiler, found hibernate classes are duplicated, which is
loaded by a new URLClassLoader in the Loop, but never GCed.
| package calljunk;
|
| import java.io.File;
| import java.net.URL;
| import java.net.URLClassLoader;
|
| public class CallJunk {
|
| static String[] dum=new String[0];
| static Class[] parameterTypes = new Class[]{dum.getClass()};
|
| public static void main(String[] args)throws Exception {
| URL[] urls = new URL[]{
| new File("../junk/cglib-2.1.3.jar").toURL(),
| new
File("../junk/commons-collections-2.1.1.jar").toURL(),
| new File("../junk/dom4j-1.6.1.jar").toURL(),
| new File("../junk/ehcache-1.1.jar").toURL(),
| new File("../junk/hibernate3.jar").toURL(),
| new File("../junk/jta.jar").toURL(),
| new
File("../junk/postgresql-8.0-311.jdbc3.jar").toURL(),
| new File("../junk/commons-logging.jar").toURL(),
| new File("../junk/bin").toURL()
| };
|
| for (int i=0; i<100; i++) {
| System.out.println("No "+i+": ");
| System.in.read();
| Class cls = new
URLClassLoader(urls).loadClass("junk.Junk");
| cls.getMethod("main", parameterTypes).invoke(null, new
Object[]{dum});
| }
| }
| }
|
|
| package junk;
| import org.hibernate.HibernateException;
| import org.hibernate.Session;
| import org.hibernate.SessionFactory;
| import org.hibernate.cfg.Configuration;
| import org.hibernate.cfg.Environment;
|
| import javax.naming.InitialContext;
|
| public class Junk {
|
| private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
|
| public static void main(String[] args) throws Exception {
| Configuration cfg = new Configuration();
| SessionFactory sFactory = null;
| try {
| cfg.configure(CONFIG_FILE_LOCATION);
| String sessionFactoryJndiName =
cfg.getProperty(Environment.SESSION_FACTORY_NAME);
| if (sessionFactoryJndiName != null) {
| cfg.buildSessionFactory();
| sFactory = (SessionFactory) (new
InitialContext()).lookup(sessionFactoryJndiName);
| } else {
| sFactory = cfg.buildSessionFactory();
| }
| } catch (Exception e) {
| throw new HibernateException("Could not initialize the
Hibernate configuration");
| }
| Session s = sFactory.getCurrentSession();
| s.close();
| sFactory.close();
| }
|
| }
|
|
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