WebSphere class loading issue

[joseph xavier]

I am migrating from WAS 4 to WAS6. I am using RSA 7.0.2 to do the migration of my code. JDK version used earlier was 1.3.18 and the current version set in my RSA is 1.4.2. I use older versions of xalan and xerces in my application. I am getting this error message.

 
[3/20/08 9:26:21:118 EDT] 0000001f ServletWrappe E   SRVE0100E: Did not realize  init() exception thrown by servlet com.amsinc.ecsg.frame.AmsServlet: java.lang.VerifyError: (class: org/apache/xalan/xpath/xdom/XercesLiaison, method: parse signature: (Lorg/xml/sax/InputSource;)V) Incompatible object argument for method call
at java.lang.Class.forName1(Native Method)
at java.lang.Class.forName(Class.java(Compiled Code))
at org.apache.xalan.xslt.XSLTEngineImpl.<init>(XSLTEngineImpl.java:360)
at com.lotus.xsl.XSLProcessor.<init>(XSLProcessor.java:102)
at com.amsinc.ecsg.frame.AmsServlet.init(AmsServlet.java:307)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.init(ServletWrapper.java:310)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.initialize(ServletWrapper.java:1696)
at com.ibm.wsspi.webcontainer.extension.WebExtensionProcessor.createServletWrapper(WebExtensionProcessor.java:140)
at com.ibm.ws.webcontainer.extension.InvokerExtensionProcessor.handleRequest(InvokerExtensionProcessor.java:358)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:334)
at com.ibm._jsp._AmsServlet._jspService(_AmsServlet.java:94)
at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:91)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1572)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:762)
at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:121)
at com.ibm.ws.jsp.webcontainerext.JSPExtensionServletWrapper.handleRequest(JSPExtensionServletWrapper.java:204)
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3071)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:236)
at com.ibm.ws.webcontainer.VirtualHost.handleRequest(VirtualHost.java:210)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1958)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:89)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:472)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:411)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:101)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1471)

I modified the server class loading settings to load PARENT_LAST and SINGLE loader. However, this affects the admin console as it to seems to be using another versions of the parsers. I get the following error

[3/20/08 9:00:07:977 EDT] 0000001e ServletWrappe E   SRVE0068E: Could not invoke the service() method on servlet action. Exception thrown : java.lang.LinkageError: Class org/w3c/dom/Document violates loader constraints:  parent and child already loaded different classes
at com.ibm.ws.util.prefs.XmlHelper.importPreferences(XmlHelper.java:108)
at com.ibm.ws.util.prefs.BasePreferencesImpl.importPreferences(BasePreferencesImpl.java:448)
at com.ibm.ws.console.core.bean.UserPreferenceBean.init(UserPreferenceBean.java:88)
at com.ibm.ws.console.core.bean.UserPreferenceBean.setUserName(UserPreferenceBean.java:54)
at com.ibm.ws.console.core.User.valueBound(User.java:102)
at com.ibm.ws.webcontainer.httpsession.SessionData.putValueGuts(SessionData.java:790)
at com.ibm.ws.webcontainer.httpsession.SessionData.putValue(SessionData.java:1229)
at com.ibm.ws.webcontainer.httpsession.SessionData.setAttribute(SessionData.java:1154)
at com.ibm.ws.webcontainer.httpsession.HttpSessionFacade.setAttribute(HttpSessionFacade.java:134)
at com.ibm.ws.console.core.action.LogonAction.createUser(LogonAction.java:322)
at com.ibm.ws.console.core.action.LogonAction.execute(LogonAction.java:190)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:275)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1486)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:510)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1572)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1521)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:136)
at com.ibm.ws.console.core.servlet.WSCUrlFilter.continueStoringTaskState(WSCUrlFilter.java:309)
at com.ibm.ws.console.core.servlet.WSCUrlFilter.doFilter(WSCUrlFilter.java:185)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:82)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:759)
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3071)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:236)
at com.ibm.ws.webcontainer.VirtualHost.handleRequest(VirtualHost.java:210)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1958)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:89)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:472)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:411)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:288)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminaters(NewConnectionInitialReadCallback.java:207)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:109)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)
at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1471)

Has anybody faced this issue? Any help will be highly appreciated.