Hello,

When calling sessionFactory.close(), i get a NullPointerException. From the error, it seems that the cache could not be destroyed because of the NullPointerException.

Exception:



There is a post with a similar problem, but with no reply:

http://forum.hibernate.org/viewtopic.php?t=928696

Any ideas? Thanks

I am using:

Hibernate 2.1.3
OSCache 2.0.2

Um, since the NPE originates inside OSCache, I guess it is better to direct your question to OSCache guys. Try putting the src for OSCache in your sourcepath and using your debugger.

Level WARN
Logger net.sf.hibernate.cache.ReadWriteCache
Message could not destroy cache
Class net.sf.hibernate.cache.ReadWriteCache
Method destroy
Line 218
File ReadWriteCache.java
Properties {{log4j.remoteSourceInfo,localhost:55403}{log4jid,5}}

Throwable
java.lang.NullPointerException at com.opensymphony.oscache.base.AbstractCacheAdministrator.finalizeListeners(AbstractCacheAdministrator.java:326) at
com.opensymphony.oscache.general.GeneralCacheAdministrator.destroy(GeneralCacheAdministrator.java:187) at
net.sf.hibernate.cache.OSCache.destroy(OSCache.java:51) at
net.sf.hibernate.cache.ReadWriteCache.destroy(ReadWriteCache.java:215) at
net.sf.hibernate.impl.SessionFactoryImpl.close(SessionFactoryImpl.java:536) at
org.springframework.orm.hibernate.LocalSessionFactoryBean.destroy(LocalSessionFactoryBean.java:565) at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.destroyBean(AbstractAutowireCapableBeanFactory.java:740) at
org.springframework.beans.factory.support.AbstractBeanFactory.destroySingleton(AbstractBeanFactory.java:363) at
org.springframework.beans.factory.support.AbstractBeanFactory.destroySingletons(AbstractBeanFactory.java:349) at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.destroySingletons(AbstractAutowireCapableBeanFactory.java:718) at
org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:382) at
org.springframework.web.context.ContextLoader.closeWebApplicationContext(ContextLoader.java:178) at
org.springframework.web.context.ContextLoaderListener.contextDestroyed(ContextLoaderListener.java:63) at
org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3816) at
org.apache.catalina.core.StandardContext.stop(StandardContext.java:4429) at
org.apache.catalina.core.StandardContext.reload(StandardContext.java:2986) at
org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:1019) at
org.apache.catalina.manager.HTMLManagerServlet.reload(HTMLManagerServlet.java:524) at
org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:147) at javax.servlet.http.HttpServlet.service(HttpServlet.java:743) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284) at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204) at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257) at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245) at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199) at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:587) at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149) at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:195) at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164) at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149) at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156) at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151) at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:564) at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972) at
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206) at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828) at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700) at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584) at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) at java.lang.Thread.run(Thread.java:534)

I could be wrong, but I think the above errors are leading to an OutOfMemory exception. When i start/stop my WebModule in Tomcat, a few times, I eventually get an OutOfMemory exception.

If the Cache is not destroyed, could it be lingering around the in the Tomcat JVM?

...this NPE was causing a memory leak. :(

However, I recently upgraded to hibernate v2.1.4, and problem solved.

elendal: Can you upgrade, and let me know if this fixes your NPE?

Thanks