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AXIS - Xerces Classloading Problems with WebSphere

Rr Kumaran
Ranch Hand

Joined: Sep 17, 2001
Posts: 548
Hi All,

I am trying to deploy Apache AXIS 1.2 RC2 as Web Module inside a EAR deployed using WSAD 5.1.2's WebSphere 5.0 Test Environment.


Websphere 5.0 server has built with its own logging component internally for its own logging purposes and has been kept in Webphere java runtime extension folder. So whenever that logging component has been called by default the logger and manager has been loaded from the extension class loader. We need to avoid this scenario for our own applications deployed on WAS 5.0 that use the same logging component inside our EAR. Otherwise we could not possible to load application specific loggers� properties files. So in order to achieve this, the ear file
class loading policy should be kept as PARENT_LAST. So the application will able to locate and load our logging component files from Shared libraries then will try to load other classes from extension class loader. Otherwise jlog framework
will not work.

So the settings that work for our logging component and do not work for AXIS Web Module integration into the same EAR are below:

a.ear Classloader mode: PARENT_LAST (must)
b.ear WAR classloader policy: APPLICATION
c.war Classloader mode : PARENT_LAST or PARENT_FIRST (can be anything)


WebSphere 5.0 exception stack trace
---------------------------------------------------------------------------------------------------
[3/14/05 17:58:53:199 IST] 4f58b287 WebGroup I SRVE0180I: [Apache-Axis] [/Axis12Rc2IrscWeb] [Servlet.LOG]: AdminServlet: init
[3/14/05 17:58:53:418 IST] 4f58b287 SystemOut O - Exception:
java.lang.ClassCastException: org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
at javax.xml.parsers.DocumentBuilderFactory.newInstance(Unknown Source)
at org.apache.axis.utils.XMLUtils.getDOMFactory(XMLUtils.java:200)
at org.apache.axis.utils.XMLUtils.<clinit>(XMLUtils.java:83)
at org.apache.axis.configuration.FileProvider.configureEngine(FileProvider.java:176)
at org.apache.axis.AxisEngine.init(AxisEngine.java:162)
at org.apache.axis.AxisEngine.<init>(AxisEngine.java:146)
at org.apache.axis.server.AxisServer.<init>(AxisServer.java:87)
at org.apache.axis.server.DefaultAxisServerFactory.createServer(DefaultAxisServerFactory.java:109)
at org.apache.axis.server.DefaultAxisServerFactory.getServer(DefaultAxisServerFactory.java:73)
at org.apache.axis.server.AxisServer.getServer(AxisServer.java:72)
at org.apache.axis.transport.http.AxisServletBase.getEngine(AxisServletBase.java:183)
at org.apache.axis.transport.http.AxisServletBase.getOption(AxisServletBase.java:370)
at org.apache.axis.transport.http.AxisServletBase.init(AxisServletBase.java:110)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doInit(StrictServletInstance.java:82)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._init(StrictLifecycleServlet.java:147)
at com.ibm.ws.webcontainer.servlet.PreInitializedServletState.init(StrictLifecycleServlet.java:270)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.init(StrictLifecycleServlet.java:113)
at com.ibm.ws.webcontainer.servlet.ServletInstance.init(ServletInstance.java:189)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.addServlet(WebAppServletManager.java:870)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadServlet(WebAppServletManager.java:224)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadAutoLoadServlets(WebAppServletManager.java:542)
at com.ibm.ws.webcontainer.webapp.WebApp.loadServletManager(WebApp.java:1270)
at com.ibm.ws.webcontainer.webapp.WebApp.init(WebApp.java:277)
at com.ibm.ws.webcontainer.srt.WebGroup.loadWebApp(WebGroup.java:396)
at com.ibm.ws.webcontainer.srt.WebGroup.init(WebGroup.java:216)
at com.ibm.ws.webcontainer.WebContainer.addWebApplication(WebContainer.java:984)
at com.ibm.ws.runtime.component.WebContainerImpl.install(WebContainerImpl.java:136)
at com.ibm.ws.runtime.component.WebContainerImpl.start(WebContainerImpl.java:356)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:415)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:787)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:351)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:575)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:268)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:246)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ApplicationServerImpl.start(ApplicationServerImpl.java:117)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ServerImpl.start(ServerImpl.java:183)
at com.ibm.ws.runtime.WsServer.start(WsServer.java:128)
at com.ibm.ws.runtime.WsServer.main(WsServer.java:225)
at java.lang.reflect.Method.invoke(Native Method)
at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:94)
at com.ibm.etools.websphere.tools.runner.api.ServerRunnerV5$1.run(ServerRunnerV5.java:97)

[3/14/05 17:58:53:434 IST] 4f58b287 ServletInstan E SRVE0100E: Did not realize init() exception thrown by servlet AdminServlet: javax.servlet.ServletException
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doInit(StrictServletInstance.java:99)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._init(StrictLifecycleServlet.java:147)
at com.ibm.ws.webcontainer.servlet.PreInitializedServletState.init(StrictLifecycleServlet.java:270)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.init(StrictLifecycleServlet.java:113)
at com.ibm.ws.webcontainer.servlet.ServletInstance.init(ServletInstance.java:189)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.addServlet(WebAppServletManager.java:870)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadServlet(WebAppServletManager.java:224)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadAutoLoadServlets(WebAppServletManager.java:542)
at com.ibm.ws.webcontainer.webapp.WebApp.loadServletManager(WebApp.java:1270)
at com.ibm.ws.webcontainer.webapp.WebApp.init(WebApp.java:277)
at com.ibm.ws.webcontainer.srt.WebGroup.loadWebApp(WebGroup.java:396)
at com.ibm.ws.webcontainer.srt.WebGroup.init(WebGroup.java:216)
at com.ibm.ws.webcontainer.WebContainer.addWebApplication(WebContainer.java:984)
at com.ibm.ws.runtime.component.WebContainerImpl.install(WebContainerImpl.java:136)
at com.ibm.ws.runtime.component.WebContainerImpl.start(WebContainerImpl.java:356)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:415)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:787)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:351)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:575)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:268)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:246)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ApplicationServerImpl.start(ApplicationServerImpl.java:117)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ServerImpl.start(ServerImpl.java:183)
at com.ibm.ws.runtime.WsServer.start(WsServer.java:128)
at com.ibm.ws.runtime.WsServer.main(WsServer.java:225)
at java.lang.reflect.Method.invoke(Native Method)
at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:94)
at com.ibm.etools.websphere.tools.runner.api.ServerRunnerV5$1.run(ServerRunnerV5.java:97)
---- Begin backtrace for Nested Throwables
java.lang.ExceptionInInitializerError: java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.apache.axis.utils.XMLUtils.initSAXFactory(XMLUtils.java:188)
at org.apache.axis.utils.XMLUtils.<clinit>(XMLUtils.java:96)
at org.apache.axis.configuration.FileProvider.configureEngine(FileProvider.java:176)
at org.apache.axis.AxisEngine.init(AxisEngine.java:162)
at org.apache.axis.AxisEngine.<init>(AxisEngine.java:146)
at org.apache.axis.server.AxisServer.<init>(AxisServer.java:87)
at org.apache.axis.server.DefaultAxisServerFactory.createServer(DefaultAxisServerFactory.java:109)
at org.apache.axis.server.DefaultAxisServerFactory.getServer(DefaultAxisServerFactory.java:73)
at org.apache.axis.server.AxisServer.getServer(AxisServer.java:72)
at org.apache.axis.transport.http.AxisServletBase.getEngine(AxisServletBase.java:183)
at org.apache.axis.transport.http.AxisServletBase.getOption(AxisServletBase.java:370)
at org.apache.axis.transport.http.AxisServletBase.init(AxisServletBase.java:110)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doInit(StrictServletInstance.java:82)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._init(StrictLifecycleServlet.java:147)
at com.ibm.ws.webcontainer.servlet.PreInitializedServletState.init(StrictLifecycleServlet.java:270)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.init(StrictLifecycleServlet.java:113)
at com.ibm.ws.webcontainer.servlet.ServletInstance.init(ServletInstance.java:189)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.addServlet(WebAppServletManager.java:870)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadServlet(WebAppServletManager.java:224)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadAutoLoadServlets(WebAppServletManager.java:542)
at com.ibm.ws.webcontainer.webapp.WebApp.loadServletManager(WebApp.java:1270)
at com.ibm.ws.webcontainer.webapp.WebApp.init(WebApp.java:277)
at com.ibm.ws.webcontainer.srt.WebGroup.loadWebApp(WebGroup.java:396)
at com.ibm.ws.webcontainer.srt.WebGroup.init(WebGroup.java:216)
at com.ibm.ws.webcontainer.WebContainer.addWebApplication(WebContainer.java:984)
at com.ibm.ws.runtime.component.WebContainerImpl.install(WebContainerImpl.java:136)
at com.ibm.ws.runtime.component.WebContainerImpl.start(WebContainerImpl.java:356)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:415)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:787)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:351)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:575)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:268)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:246)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ApplicationServerImpl.start(ApplicationServerImpl.java:117)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ServerImpl.start(ServerImpl.java:183)
at com.ibm.ws.runtime.WsServer.start(WsServer.java:128)
at com.ibm.ws.runtime.WsServer.main(WsServer.java:225)
at java.lang.reflect.Method.invoke(Native Method)
at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:94)
at com.ibm.etools.websphere.tools.runner.api.ServerRunnerV5$1.run(ServerRunnerV5.java:97)


[3/14/05 17:58:53:606 IST] 4f58b287 WebGroup E SRVE0020E: [Servlet Error]-[AdminServlet]: Failed to load servlet: java.lang.ExceptionInInitializerError: java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.apache.axis.utils.XMLUtils.initSAXFactory(XMLUtils.java:188)
at org.apache.axis.utils.XMLUtils.<clinit>(XMLUtils.java:96)
at org.apache.axis.configuration.FileProvider.configureEngine(FileProvider.java:176)
at org.apache.axis.AxisEngine.init(AxisEngine.java:162)
at org.apache.axis.AxisEngine.<init>(AxisEngine.java:146)
at org.apache.axis.server.AxisServer.<init>(AxisServer.java:87)
at org.apache.axis.server.DefaultAxisServerFactory.createServer(DefaultAxisServerFactory.java:109)
at org.apache.axis.server.DefaultAxisServerFactory.getServer(DefaultAxisServerFactory.java:73)
at org.apache.axis.server.AxisServer.getServer(AxisServer.java:72)
at org.apache.axis.transport.http.AxisServletBase.getEngine(AxisServletBase.java:183)
at org.apache.axis.transport.http.AxisServletBase.getOption(AxisServletBase.java:370)
at org.apache.axis.transport.http.AxisServletBase.init(AxisServletBase.java:110)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doInit(StrictServletInstance.java:82)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._init(StrictLifecycleServlet.java:147)
at com.ibm.ws.webcontainer.servlet.PreInitializedServletState.init(StrictLifecycleServlet.java:270)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.init(StrictLifecycleServlet.java:113)
at com.ibm.ws.webcontainer.servlet.ServletInstance.init(ServletInstance.java:189)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.addServlet(WebAppServletManager.java:870)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadServlet(WebAppServletManager.java:224)
at com.ibm.ws.webcontainer.webapp.WebAppServletManager.loadAutoLoadServlets(WebAppServletManager.java:542)
at com.ibm.ws.webcontainer.webapp.WebApp.loadServletManager(WebApp.java:1270)
at com.ibm.ws.webcontainer.webapp.WebApp.init(WebApp.java:277)
at com.ibm.ws.webcontainer.srt.WebGroup.loadWebApp(WebGroup.java:396)
at com.ibm.ws.webcontainer.srt.WebGroup.init(WebGroup.java:216)
at com.ibm.ws.webcontainer.WebContainer.addWebApplication(WebContainer.java:984)
at com.ibm.ws.runtime.component.WebContainerImpl.install(WebContainerImpl.java:136)
at com.ibm.ws.runtime.component.WebContainerImpl.start(WebContainerImpl.java:356)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:415)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:787)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:351)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:575)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:268)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:246)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ApplicationServerImpl.start(ApplicationServerImpl.java:117)
at com.ibm.ws.runtime.component.ContainerImpl.startComponents(ContainerImpl.java:543)
at com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.java:418)
at com.ibm.ws.runtime.component.ServerImpl.start(ServerImpl.java:183)
at com.ibm.ws.runtime.WsServer.start(WsServer.java:128)
at com.ibm.ws.runtime.WsServer.main(WsServer.java:225)
at java.lang.reflect.Method.invoke(Native Method)
at com.ibm.ws.bootstrap.WSLauncher.main(WSLauncher.java:94)
at com.ibm.etools.websphere.tools.runner.api.ServerRunnerV5$1.run(ServerRunnerV5.java:97)
---------------------------------------------------------------------------------------------------


One point to note is that the settings that do not work for our logging component and work for AXIS Web Module integration into the same EAR are below and I am not sure why these settings work:

a.ear Classloader mode: PARENT_FIRST (must)
b.ear WAR classloader policy: APPLICATION
c.war Classloader mode : PARENT_LAST or PARENT_FIRST (can be anything)


Now can anyone please tell me how do I avoid above errors.



Thanks & Regards,


RR Kumaran
SCJP 1.4
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: AXIS - Xerces Classloading Problems with WebSphere