How to use JCR from other WAR? (hibernate lazy init)

skoptelov — Sun, 27 Nov 2005 12:51:20 GMT

My use case is that I have JBoss installation with Alfresco WAR (from JBoss bundle) and my EAR (EJB3 beans + WAR). I need to access Alfresco's JCR repository from my web application. Alfresco's bundled Hibernate is incompatible with JBoss EJB3 deployer one's so I have to isolate Alfresco WAR classl

Re: How to use JCR from other WAR? (hibernate lazy init)

rdanner — Mon, 28 Nov 2005 06:14:43 GMT

My use case is that I have JBoss installation with Alfresco WAR (from JBoss bundle) and my EAR (EJB3 beans + WAR). I need to access Alfresco's JCR repository from my web application.

Alfresco's bundled Hibernate is incompatible with JBoss EJB3 deployer one's so I have to isolate Alfresco WAR classloader from UCL. The main problem is that repository impementation is hibernate-backed and hibernate uses lazy loading - tries to load objects (nodes and their properties) on client (my webapp) side.

Question is - how should I get reference to javax.jcr.Repository instance so that all real work will be done in Alfresco WAR classes without trying to use my webapp classes?

I tried the following:
1. Simply put repository to JNDI and access it. Doesn't work because of ClassCastExceptions - uses hibernate classes from my webapp classloader which are different from Alfresco's ones.
2. Put ejb3 deployer libs as shared (myserver/lib) and remove hibernate-related jars from alfresco so we'll both use same jars. Doesn't work because now I have to put ALL alfresco jars as shared for jboss server and I really don't want it.
3. Export Spring JCR.Repository bean through RMI. Doesn't work because of
Caused by: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: org.alfresco.jcr.util.JCRProxyFactory$SessionContextInvocationHandler
‍‍‍

The UCL is one of the oddities of jboss… what is your reason for turning it on? It is in contradiction to the J2EE spec.

I think there may be valid reasons for it (all good rules have exceptions.) but … because (a number of people state this one) jboss ships with it turned on, is not in my oppinion a good reason. What is your reasons for using the UCL?

Re: How to use JCR from other WAR? (hibernate lazy init)

skoptelov — Mon, 28 Nov 2005 07:53:05 GMT

The whole WTF is that I don't use it (I think) and get this exception. Now I'm trying the following configuration (excerpts):

deploy/jbossweb-tomcat55.sar/META-INF/jboss-service.xml:


      <attribute name="Java2ClassLoadingCompliance">false</attribute>
      <attribute name="UseJBossWebLoader">false</attribute>
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deploy/alfresco.war/WEB-INF/jboss-web.xml:


<?xml version="1.0"?>
<jboss-web>
 <class-loading java2ClassLoadingCompliance="false">
 <loader-repository>
     alfresco.org:loader=alfresco.war
     <loader-repository-config>java2ParentDelegation=false</loader-repository-config>
 </loader-repository>
 </class-loading>
</jboss-web>
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deploy/naming-service.xml:


      <!– The call by value mode. true if all lookups are unmarshalled using
      the caller's TCL, false if in VM lookups return the value by reference.
      –>
      <attribute name="CallByValue">true</attribute>
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Also I use JCR-RMI to wrap non-serializable Alfresco implementation.
And I still get this:


13:27:31,602 WARN  [RequestExceptionReporter] Exception during post-request cleanup: org.hibernate.hql.ast.HqlToken
java.lang.ClassCastException: org.hibernate.hql.ast.HqlToken
        at antlr.CharScanner.makeToken(CharScanner.java:175)
        at org.hibernate.hql.ast.HqlLexer.makeToken(HqlLexer.java:39)
        at org.hibernate.hql.antlr.HqlBaseLexer.mIDENT(HqlBaseLexer.java:580)
        at org.hibernate.hql.antlr.HqlBaseLexer.nextToken(HqlBaseLexer.java:264)
        at antlr.TokenBuffer.fill(TokenBuffer.java:69)
        at antlr.TokenBuffer.LA(TokenBuffer.java:80)
        at antlr.LLkParser.LA(LLkParser.java:52)
        at org.hibernate.hql.antlr.HqlBaseParser.statement(HqlBaseParser.java:139)
        at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:231)
        at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:150)
        at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:100)
        at org.hibernate.impl.SessionFactoryImpl.getQuery(SessionFactoryImpl.java:459)
        at org.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:904)
        at org.hibernate.impl.SessionImpl.list(SessionImpl.java:854)
        at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)
        at org.alfresco.repo.node.db.hibernate.HibernateNodeDaoServiceImpl$2.doInHibernate(HibernateNodeDaoServiceImpl.java:130)
        at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:311)
        at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:288)
        at org.alfresco.repo.node.db.hibernate.HibernateNodeDaoServiceImpl.getStores(HibernateNodeDaoServiceImpl.java:133)
        at jrockit.reflect.VirtualNativeMethodInvoker.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)
        at org.alfresco.repo.transaction.NodeDaoServiceTransactionInterceptor.invoke(NodeDaoServiceTransactionInterceptor.java:61)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
        at $Proxy46.getStores(Unknown Source)
        at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
        at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
        at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:179)
        at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
        at $Proxy183.login(Ljavax.jcr.Credentials;)Lorg.apache.jackrabbit.rmi.remote.RemoteSession;(Unknown Source)
        at org.apache.jackrabbit.rmi.client.ClientRepository.login(ClientRepository.java:97)
        at com.fis.web.alfresco.AlfrescoJcrSessionFactory.createSession(AlfrescoJcrSessionFactory.java:47)
        at $SessionFactory_107d5c41552.createSession()Ljavax.jcr.Session;($SessionFactory_107d5c41552.java:???)
        at com.fis.web.jcr.impl.SessionProviderImpl.getSession(SessionProviderImpl.java:37)
        at $SessionProvider_107d5c41514.getSession()Ljavax.jcr.Session;($SessionProvider_107d5c41514.java:???)
        at com.fis.web.jcr.JcrBinding.getObject(JcrBinding.java:26)
        at org.apache.tapestry.binding.AbstractBinding.getObject(AbstractBinding.java:87)
        at $Info_0.pageDetached(Lorg.apache.tapestry.event.PageEvent;)V($Info_0.java:???)
        at org.apache.tapestry.AbstractPage.firePageDetached(AbstractPage.java:452)
        at org.apache.tapestry.AbstractPage.detach(AbstractPage.java:140)
        at org.apache.tapestry.pageload.PageSource.releasePage(PageSource.java:138)
        at $IPageSource_107d5c4142a.releasePage(Lorg.apache.tapestry.IPage;)V($IPageSource_107d5c4142a.java:???)
        at org.apache.tapestry.engine.RequestCycle.cleanup(RequestCycle.java:190)
        at org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:289)
        at org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:60)
        at $WebRequestServicer_107d5c41480.service(Lorg.apache.tapestry.web.WebRequest;Lorg.apache.tapestry.web.WebResponse;)V($WebRequestServicer_107d5c41480.java:???)
        at com.fis.web.jcr.impl.SessionFilter.service(SessionFilter.java:14)
        at $WebRequestServicerFilter_107d5c4147e.service(Lorg.apache.tapestry.web.WebRequest;Lorg.apache.tapestry.web.WebResponse;Lorg.apache.tapestry.services.WebRequestServicer;)V($WebRequestServicerFilter_107d5c4147e.java:???)
        at $WebRequestServicer_107d5c41482.service(Lorg.apache.tapestry.web.WebRequest;Lorg.apache.tapestry.web.WebResponse;)V($WebRequestServicer_107d5c41482.java:???)
        at $WebRequestServicer_107d5c4147a.service(Lorg.apache.tapestry.web.WebRequest;Lorg.apache.tapestry.web.WebResponse;)V($WebRequestServicer_107d5c4147a.java:???)
        at org.apache.tapestry.services.impl.WebRequestServicerPipelineBridge.service(WebRequestServicerPipelineBridge.java:56)
        at $ServletRequestServicer_107d5c4146a.service(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V($ServletRequestServicer_107d5c4146a.java:???)
        at org.apache.tapestry.request.DecodedRequestInjector.service(DecodedRequestInjector.java:55)
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I really don't understand why can this happen - alfresco WAR is isolated and all calls to Alfresco do pass through serialization/deserialization when using Repository in JNDI.

Re: How to use JCR from other WAR? (hibernate lazy init)

skoptelov — Mon, 28 Nov 2005 07:56:06 GMT

And one interesting detail about this fault - it only occurs after I upload some content to Alfresco (any content in any space)

Re: How to use JCR from other WAR? (hibernate lazy init)

skoptelov — Mon, 28 Nov 2005 12:23:27 GMT

Solved problem by running Alfresco in separate JBoss server and exporting it in JNDI context through JCR-RMI. On client side attached it as external JNDI context.
UCL is EVIL!

Re: How to use JCR from other WAR? (hibernate lazy init)

jack — Tue, 06 Dec 2005 01:58:32 GMT

Hi,

Could you kindly share the JNDI configuration you used on the jboss side?

Thanks,

Jack

topic How to use JCR from other WAR? (hibernate lazy init) in Alfresco Archive

How to use JCR from other WAR? (hibernate lazy init)

Re: How to use JCR from other WAR? (hibernate lazy init)

Re: How to use JCR from other WAR? (hibernate lazy init)

Re: How to use JCR from other WAR? (hibernate lazy init)

Re: How to use JCR from other WAR? (hibernate lazy init)

Re: How to use JCR from other WAR? (hibernate lazy init)