在JBOSS AS 5.1.0 GA中找不到PersistenceProvider异常

Question

I am trying to deploy the product in JBOSS AS 5.1.0 GA using eclipse in Linux.

Previously it was executed successfully on tomcat 6. While deploying I got many errors. I had solved one by one.

But now ClassNotFoundException raised due to the PersistenceProvider.

My product environment is JPA 1.0. and I am using toplink-essentials.jar, toplink-essentials-agent.jar. (my toplink version is 2.0)

Please see the bug decription...

11:46:08,276 ERROR [AbstractKernelController] Error installing to Start: name=persistence.unit:unitName=#Entity state=Create java.lang.ClassNotFoundException: oracle.toplink.essentials.PersistenceProvider from BaseClassLoader@12bb617{VFSClassLoaderPolicy@bfa9d6{name=vfsfile:/opt/jboss-5.1.0.GA/server/default/deploy/iportman_gpl.war/ domain=ClassLoaderDomain@16877f8{name=DefaultDomain parentPolicy=BEFORE parent=org.jboss.bootstrap.NoAnnotationURLClassLoader@1837697} roots=[MemoryContextHandler@19344978[path= context=vfsmemory://3j011-idx41v-hfxjen4j-1-hfxjf9qd-2a real=vfsmemory://3j011-idx41v-hfxjen4j-1-hfxjf9qd-2a], FileHandler@22157425[path=iportman_gpl.war/WEB-INF/classes context=file:/opt/jboss-5.1.0.GA/server/default/deploy/ real=file:/opt/jboss-5.1.0.GA/server/default/deploy/iportman_gpl.war/WEB-INF/classes/]

This is the only bug showing while I am trying to deploy my project which is a WAR file.

While in execution time jboss is loading the both jars. (toplink-essentials.jar, toplink-essentials-agent.jar). (This is also showing on error console)

DelegatingHandler@13596360[path=iportman_gpl.war/WEB-INF/lib/toplink-essentials.jar context=file:/opt/jboss-5.1.0.GA/server/default/deploy/ real=file:/opt/jboss-5.1.0.GA/server/default/deploy/iportman_gpl.war/WEB-INF/lib/toplink-essentials.jar] DelegatingHandler@32401617[path=iportman_gpl.war/WEB-INF/lib/toplink-essentials-agent.jar context=file:/opt/jboss-5.1.0.GA/server/default/deploy/ real=file:/opt/jboss-5.1.0.GA/server/default/deploy/iportman_gpl.war/WEB-INF/lib/toplink-essentials-agent.jar]

but still it is showing the error.

When I had Google about this issue then i had seen some explanations like.. "may be it is loading two PersistenceProvider classes or jboss also loading their JPA classes".

But i had set the parent-first="false" in my jboss-classloading.xml

below code is in my /WEB-INF/jboss-classloading.xml

<?xml version="1.0" encoding="UTF-8"?>
<classloading xmlns="urn:jboss:classloading:1.0"
export-all="NON_EMPTY"
import-all="true"
parent-first="false">
</classloading>

I also declared the below code in my /WEB-INF/classes/META-INF/ persistence.xml

 <persistence-unit name="Entity" transaction-type="RESOURCE_LOCAL">
 <provider>oracle.toplink.essentials.PersistenceProvider</provider>

Please help me to solve the problem. I posted the same issue in JBOSS community for their help, but i did not get any response.

(For detail decription for persistence.xml and list of all jars, please see the Jboss community link )

So, Anyone help me to find out problem. Any suggestions will be a greatly helpful to me... Thanks in Advance..

(Sorry for my bad English)

Answer 1

当我如下删除persistence.xml中 <provider>标记之间的空白时，上述问题就解决了。

<provider>oracle.toplink.essentials.PersistenceProvider</provider>