cannot catch JPA exception??

peiguo · **Joined:** Mon Jun 16, 2008 1:15 pm **Posts:** 15

We use JBoss 4.2.2, and I am wondering why my code cannot catch JPA exception. The code is straight forward:

Code:

   public Vrnt getVrnt(int item) throws Throwable {
      Vrnt v = null;
      try
      {
         v = manager.find(Vrnt.class, new Integer(item));

      }
      catch (Throwable e)
      {
         System.out.println("before throw e");
         throw e;
      }
      return v;
   }

The print statement was never reached, and the exception is (I know how to fix this and make the exception go away, but that's not the concern. My concern is that I want to catch the exception in my code, it just doesn't make sense to me that I cannot catch...):

Code:

2008-06-19 12:58:53,316 ERROR [org.hibernate.LazyInitializationException] failed to lazily initialize a collection of role: org.jboss.tutorial.entity.bean.Vrnt.upcs, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jboss.tutorial.entity.bean.Vrnt.upcs, no session or session was closed
 at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
 at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
 at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
 at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
 at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
 at com.sun.xml.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:274)
 at com.sun.xml.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:261)
 at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:129)
 at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:152)
 at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:322)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:679)
 at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:150)
 at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:322)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:679)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:151)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:185)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:305)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:312)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:71)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:488)
 at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:317)
 at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:246)
 at org.jboss.ws.core.jaxws.JAXBSerializer.serialize(JAXBSerializer.java:80)
 at org.jboss.ws.core.binding.SerializerSupport.serialize(SerializerSupport.java:57)
 at org.jboss.ws.core.soap.ObjectContent.marshallObjectContents(ObjectContent.java:159)
 at org.jboss.ws.core.soap.ObjectContent.transitionTo(ObjectContent.java:72)
 at org.jboss.ws.core.soap.SOAPContentElement.transitionTo(SOAPContentElement.java:140)
 at org.jboss.ws.core.soap.SOAPContentElement.writeElement(SOAPContentElement.java:531)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:840)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:825)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:840)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:825)
 at org.jboss.ws.core.soap.SOAPElementWriter.writeElementInternal(SOAPElementWriter.java:149)
 at org.jboss.ws.core.soap.SOAPElementWriter.writeElement(SOAPElementWriter.java:130)
 at org.jboss.ws.core.soap.SOAPMessageImpl.writeTo(SOAPMessageImpl.java:291)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.sendResponse(RequestHandlerImpl.java:343)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:306)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:189)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:122)
 at org.jboss.wsf.stack.jbws.EndpointServlet.service(EndpointServlet.java:84)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
 at java.lang.Thread.run(Thread.java:595)
2008-06-19 12:59:34,737 DEBUG [org.jboss.ws.core.soap.MessageContextAssociation] popMessageContext: org.jboss.ws.core.jaxws.handler.SOAPMessageContextJAXWS@179a727 (Thread http-127.0.0.1-8080-1)
2008-06-19 12:59:34,737 ERROR [org.jboss.wsf.stack.jbws.RequestHandlerImpl] Error processing web service request
org.jboss.ws.WSException: javax.xml.ws.WebServiceException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jboss.tutorial.entity.bean.Vrnt.upcs, no session or session was closed
 at org.jboss.ws.WSException.rethrow(WSException.java:68)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:310)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:189)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:122)
 at org.jboss.wsf.stack.jbws.EndpointServlet.service(EndpointServlet.java:84)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
 at java.lang.Thread.run(Thread.java:595)
Caused by: javax.xml.ws.WebServiceException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jboss.tutorial.entity.bean.Vrnt.upcs, no session or session was closed
 at org.jboss.ws.core.jaxws.JAXBSerializer.handleMarshallException(JAXBSerializer.java:122)
 at org.jboss.ws.core.jaxws.JAXBSerializer.serialize(JAXBSerializer.java:86)
 at org.jboss.ws.core.binding.SerializerSupport.serialize(SerializerSupport.java:57)
 at org.jboss.ws.core.soap.ObjectContent.marshallObjectContents(ObjectContent.java:159)
 at org.jboss.ws.core.soap.ObjectContent.transitionTo(ObjectContent.java:72)
 at org.jboss.ws.core.soap.SOAPContentElement.transitionTo(SOAPContentElement.java:140)
 at org.jboss.ws.core.soap.SOAPContentElement.writeElement(SOAPContentElement.java:531)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:840)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:825)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:840)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:825)
 at org.jboss.ws.core.soap.SOAPElementWriter.writeElementInternal(SOAPElementWriter.java:149)
 at org.jboss.ws.core.soap.SOAPElementWriter.writeElement(SOAPElementWriter.java:130)
 at org.jboss.ws.core.soap.SOAPMessageImpl.writeTo(SOAPMessageImpl.java:291)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.sendResponse(RequestHandlerImpl.java:343)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:306)
 ... 22 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jboss.tutorial.entity.bean.Vrnt.upcs, no session or session was closed
 at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
 at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
 at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
 at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
 at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
 at com.sun.xml.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:274)
 at com.sun.xml.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:261)
 at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:129)
 at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:152)
 at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:322)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:679)
 at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:150)
 at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:322)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:679)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:151)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:185)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:305)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:312)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:71)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:488)
 at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:317)
 at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:246)
 at org.jboss.ws.core.jaxws.JAXBSerializer.serialize(JAXBSerializer.java:80)
 ... 36 more
2008-06-19 12:59:35,284 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/order].[CalculatorBean]] Servlet.service() for servlet CalculatorBean threw exception
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.jboss.tutorial.entity.bean.Vrnt.upcs, no session or session was closed
 at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
 at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
 at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
 at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
 at org.hibernate.collection.PersistentBag.iterator(PersistentBag.java:249)
 at com.sun.xml.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:274)
 at com.sun.xml.bind.v2.runtime.reflect.Lister$CollectionLister.iterator(Lister.java:261)
 at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:129)
 at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:152)
 at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:322)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:679)
 at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:150)
 at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:322)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:679)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:151)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:185)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:305)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:312)
 at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:71)
 at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:488)
 at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:317)
 at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:246)
 at org.jboss.ws.core.jaxws.JAXBSerializer.serialize(JAXBSerializer.java:80)
 at org.jboss.ws.core.binding.SerializerSupport.serialize(SerializerSupport.java:57)
 at org.jboss.ws.core.soap.ObjectContent.marshallObjectContents(ObjectContent.java:159)
 at org.jboss.ws.core.soap.ObjectContent.transitionTo(ObjectContent.java:72)
 at org.jboss.ws.core.soap.SOAPContentElement.transitionTo(SOAPContentElement.java:140)
 at org.jboss.ws.core.soap.SOAPContentElement.writeElement(SOAPContentElement.java:531)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:840)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:825)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:840)
 at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:825)
 at org.jboss.ws.core.soap.SOAPElementWriter.writeElementInternal(SOAPElementWriter.java:149)
 at org.jboss.ws.core.soap.SOAPElementWriter.writeElement(SOAPElementWriter.java:130)
 at org.jboss.ws.core.soap.SOAPMessageImpl.writeTo(SOAPMessageImpl.java:291)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.sendResponse(RequestHandlerImpl.java:343)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:306)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:189)
 at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:122)
 at org.jboss.wsf.stack.jbws.EndpointServlet.service(EndpointServlet.java:84)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
 at java.lang.Thread.run(Thread.java:595)
2008-06-19 13:00:04,925 DEBUG [com.arjuna.ats.arjuna.logging.arjLogger] Periodic recovery - first pass <Thu, 19 Jun 2008 13:00:04>
2008-06-19 13:00:04,925 DEBUG [com.arjuna.ats.arjuna.logging.arjLogger] StatusModule: first pass 

cbredesen · **Posted:** Fri Jun 20, 2008 4:47 pm

Looks like that exception is thrown after your method completes, and probably after the Session is closed. You're getting a LazyInitializationException when the WS stack tries to marshal something that's lazy but uninitialized.

Cameron McKenzie · **Posted:** Mon Jun 23, 2008 10:18 am

The exception isn't being called during your hibernate load. What is happening, is you are loading a JavaBean that has properties that are mapped with a Lazy fetch type. You get the bean with none of it's LazilyLoaded associations initialized, and then you close the session. Then you go to those unloaded associations and ask for them. Hibernate then says to you "look, you closed the session, and now I can't go back to the database and get the real data for these objects. Keep the session open longer, load the full object, or else, I'll throw this exception at you."

You probably need longer lasting sessions. Explore the open session in view pattern to get around these types of issues.

http://www.hibernate.org/43.html

I would also suggest that you take a read of this free tutorial on Hibernate and How Hibernate Works. It will explain why you are getting the Lazy Loading Exception, and how to avoid these LazyLoading tpe of runtime exceptions in the future:

http://jpa.ezhibernate.com/Javacode/learn.jsp?tutorial=07howhibernateworks

unrealdummy · **Joined:** Sat Feb 07, 2009 12:31 am **Posts:** 21

I really don't see extended persistence as an elegant solution especially if you're dealing with exposing your EJBs as web services. Extended persistence is only for isolated software (which are usually worthless in today's networked software)

I don't also see that FetchType=EAGER to be an elegant solution either.

A real solution is to automatically set to null all the properties of an object that are proxies. It would be very helpful to have something like this:

Hibernate.setToNullAllProxies(Object yourEntity);

Of course this should be called when the persistent context is closed.

This should make all your proxies found in the object graph (having yourEntity as the root of your object graph) to be set to null before marshalling happens during web method invocation. Thus solving the problem of the infamous LazyInitializationException.

Some say "oh, looks like you have a special use case, extended persistence is the solution" I say "oh, haven't you been in Web Services before? How about using Remote EJBs? What about desktop client-server applications? Seriously?".

I'm tired letting hibernate experts shove extended persistence to our throats knowing it doesn't fit to the given circumstance.

clemenb · **Joined:** Wed Jul 29, 2009 11:01 pm **Posts:** 7

I agree, it would be very useful to have Hibernate transparently kill any lazily loaded proxies when a session terminates.

In the meantime, what would be the most pragmatic way to get Hibernate JPA to work in an environment of EJB3 stateless session bean web services manipulating persistent entities?

Is there any solution that does not involve eagerly loading (potentially) loads of unnecessary data or heavily relying on Hibernate specific code?

Constructive suggestions are much appreciated.

Cameron McKenzie · **Posted:** Mon Aug 10, 2009 7:37 am

You might want to check out Gilead, formerly known as Hibernate4GWT or somethign like that.

http://noon.gilead.free.fr/gilead/index ... e=tutorial

It gets rid of the prospect of that lazy initialization problem by returning just the pure POJO. It's managed to get me out of a few binds.