Hello.

I'm trying to make OpenJPA and Xerces play along.

When I use my code as is without Xerces, everything works until I use new
DocumentImpl(); - no surprise there.

When I add my xercesImpl.jar, sometimes it works (I suppose when the
ClassLoader hasn't got poisoned) and then it stops when I redeploy:

 org.apache.openjpa.persistence.PersistenceException:
org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be
cast to org.apache.xerces.xni.parser.XMLParserConfiguration
        at 
org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:196)
        at 
org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:192)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:145)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:56)
        at org.cmd.web.fileserver.Browser.doGet(Browser.java:51)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at 
org.apache.geronimo.jetty6.InternalJettyServletHolder.handle(InternalJettyServletHolder.java:65)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at 
org.apache.geronimo.jetty6.handler.TwistyWebAppContext.access$101(TwistyWebAppContext.java:40)
        at 
org.apache.geronimo.jetty6.handler.TwistyWebAppContext$TwistyHandler.handle(TwistyWebAppContext.java:65)
        at 
org.apache.geronimo.jetty6.handler.ThreadClassloaderHandler.handle(ThreadClassloaderHandler.java:46)
        at 
org.apache.geronimo.jetty6.handler.InstanceContextHandler.handle(InstanceContextHandler.java:58)
        at 
org.apache.geronimo.jetty6.handler.UserTransactionHandler.handle(UserTransactionHandler.java:48)
        at 
org.apache.geronimo.jetty6.handler.ComponentContextHandler.handle(ComponentContextHandler.java:47)
        at 
org.apache.geronimo.jetty6.handler.TwistyWebAppContext.handle(TwistyWebAppContext.java:59)
        at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
        at 
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
        at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
        at org.apache.geronimo.pool.ThreadPool$1.run(ThreadPool.java:214)
        at 
org.apache.geronimo.pool.ThreadPool$ContextClassLoaderRunnable.run(ThreadPool.java:344)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException:
org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be
cast to org.apache.xerces.xni.parser.XMLParserConfiguration
        at org.apache.xerces.parsers.DOMParser.(Unknown Source)
        at org.apache.xerces.parsers.DOMParser.(Unknown Source)
        at org.apache.xerces.jaxp.DocumentBuilderImpl.(Unknown Source)
        at 
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown
Source)
        at 
org.apache.openjpa.lib.xml.XMLFactory.getDOMParser(XMLFactory.java:107)
        at 
org.apache.openjpa.jdbc.sql.SQLErrorCodeReader.parse(SQLErrorCodeReader.java:107)
        at 
org.apache.openjpa.jdbc.sql.DBDictionary.endConfiguration(DBDictionary.java:4128)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:505)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:430)
        at 
org.apache.openjpa.jdbc.sql.DBDictionaryFactory.newDBDictionary(DBDictionaryFactory.java:155)
        at 
org.apache.openjpa.jdbc.sql.DBDictionaryFactory.newDBDictionary(DBDictionaryFactory.java:99)
        at 
org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:562)
        at 
org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1265)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:505)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:430)
        at 
org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:103)
        at 
org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
        at 
org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
        at 
org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:863)
        at 
org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:854)
        at 
org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:638)
        at 
org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:183)
        ... 36 more

Caused by:

java.lang.ClassCastException:
org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be
cast to org.apache.xerces.xni.parser.XMLParserConfiguration
        at org.apache.xerces.parsers.DOMParser.(Unknown Source)
        at org.apache.xerces.parsers.DOMParser.(Unknown Source)
        at org.apache.xerces.jaxp.DocumentBuilderImpl.(Unknown Source)
        at 
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown
Source)
        at 
org.apache.openjpa.lib.xml.XMLFactory.getDOMParser(XMLFactory.java:107)
        at 
org.apache.openjpa.jdbc.sql.SQLErrorCodeReader.parse(SQLErrorCodeReader.java:107)
        at 
org.apache.openjpa.jdbc.sql.DBDictionary.endConfiguration(DBDictionary.java:4128)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:505)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:430)
        at 
org.apache.openjpa.jdbc.sql.DBDictionaryFactory.newDBDictionary(DBDictionaryFactory.java:155)
        at 
org.apache.openjpa.jdbc.sql.DBDictionaryFactory.newDBDictionary(DBDictionaryFactory.java:99)
        at 
org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:562)
        at 
org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1265)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:505)
        at 
org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:430)
        at 
org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:103)
        at 
org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
        at 
org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
        at 
org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:863)
        at 
org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:854)
        at 
org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:638)
        at 
org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:183)
        at 
org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:192)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:145)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:56)
        at org.cmd.web.fileserver.Browser.doGet(Browser.java:51)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at 
org.apache.geronimo.jetty6.InternalJettyServletHolder.handle(InternalJettyServletHolder.java:65)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at 
org.apache.geronimo.jetty6.handler.TwistyWebAppContext.access$101(TwistyWebAppContext.java:40)
        at 
org.apache.geronimo.jetty6.handler.TwistyWebAppContext$TwistyHandler.handle(TwistyWebAppContext.java:65)
        at 
org.apache.geronimo.jetty6.handler.ThreadClassloaderHandler.handle(ThreadClassloaderHandler.java:46)
        at 
org.apache.geronimo.jetty6.handler.InstanceContextHandler.handle(InstanceContextHandler.java:58)
        at 
org.apache.geronimo.jetty6.handler.UserTransactionHandler.handle(UserTransactionHandler.java:48)
        at 
org.apache.geronimo.jetty6.handler.ComponentContextHandler.handle(ComponentContextHandler.java:47)
        at 
org.apache.geronimo.jetty6.handler.TwistyWebAppContext.handle(TwistyWebAppContext.java:59)
        at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
        at 
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
        at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
        at org.apache.geronimo.pool.ThreadPool$1.run(ThreadPool.java:214)
        at 
org.apache.geronimo.pool.ThreadPool$ContextClassLoaderRunnable.run(ThreadPool.java:344)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)


As a novice I see two options:

a) Use the same xerces as OpenJPA - I've been unsuccessful in locating it
though.
b) Shield the application somehow. I know that EARs have hidden-classes, but
reading mailing lists it would see that it does not work with Xerces - why
I'm not sure.

How do I get around this issue?

Greetings,
-- 
Christian Svensson
Command Systems

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