it seems to me like a beginners question but i never got this thing working 
even if i deploy to jboss already a few months.
i always have to restart my jboss server to correctly deploy my war file. 
otherwise i always get this annoying "org.apache.jasper.JasperException: Unable 
to compile class for JSP" message.

how do i correct this problem? 

i am using jboss 4.0.1
windows xp sp2
java version 1.0.4_05
eclipse + myeclipse
(i do my deployment with the myeclipse tools)

my application is a web project using hibernate, struts and tiles

i hope someone can help me, because that costs me everytime about  one minute 
to restart the server and thats really annoying when correcting small problems 
and deploying often

here is the full stack trace out of the jboss server.log:


anonymous wrote : 
  | 2005-04-08 14:00:54,446 ERROR [org.jboss.web.localhost.Engine] 
ApplicationDispatcher[/EventManagement] Servlet.service() for servlet jsp threw 
exception
  | java.lang.NullPointerException
  |     at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:153)
  |     at 
org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:464)
  |     at 
org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:374)
  |     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
  |     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
  |     at java.lang.Class.forName0(Native Method)
  |     at java.lang.Class.forName(Class.java:141)
  |     at 
org.apache.tools.ant.AntTypeDefinition.getTypeClass(AntTypeDefinition.java:161)
  |     at 
org.apache.tools.ant.AntTypeDefinition.getExposedClass(AntTypeDefinition.java:135)
  |     at 
org.apache.tools.ant.ComponentHelper$AntTypeTable.getExposedClass(ComponentHelper.java:837)
  |     at 
org.apache.tools.ant.ComponentHelper.getDataTypeDefinitions(ComponentHelper.java:365)
  |     at org.apache.tools.ant.Project.getDataTypeDefinitions(Project.java:942)
  |     at 
org.apache.tools.ant.types.AbstractFileSet.getDataTypeName(AbstractFileSet.java:309)
  |     at 
org.apache.tools.ant.types.AbstractFileSet.setupDirectoryScanner(AbstractFileSet.java:374)
  |     at 
org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:350)
  |     at 
org.apache.tools.ant.taskdefs.MatchingTask.getDirectoryScanner(MatchingTask.java:186)
  |     at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:752)
  |     at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:382)
  |     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
  |     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
  |     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
  |     at 
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
  |     at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
  |     at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
  |     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
  |     at 
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)
  |     at 
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:261)
  |     at 
org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:237)
  |     at 
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:300)
  |     at 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)
  |     at 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
  |     at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
  |     at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:66)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:54)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
  |     at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
  |     at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
  |     at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
  |     at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
  |     at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
  |     at java.lang.Thread.run(Thread.java:534)
  | 
  | 
  | 2005-04-08 14:00:54,446 ERROR [org.jboss.web.localhost.Engine] 
StandardWrapperValve[action]: Servlet.service() for servlet action threw 
exception
  | java.lang.NullPointerException
  |     at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:153)
  |     at 
org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:464)
  |     at 
org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:374)
  |     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
  |     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
  |     at java.lang.Class.forName0(Native Method)
  |     at java.lang.Class.forName(Class.java:141)
  |     at 
org.apache.tools.ant.AntTypeDefinition.getTypeClass(AntTypeDefinition.java:161)
  |     at 
org.apache.tools.ant.AntTypeDefinition.getExposedClass(AntTypeDefinition.java:135)
  |     at 
org.apache.tools.ant.ComponentHelper$AntTypeTable.getExposedClass(ComponentHelper.java:837)
  |     at 
org.apache.tools.ant.ComponentHelper.getDataTypeDefinitions(ComponentHelper.java:365)
  |     at org.apache.tools.ant.Project.getDataTypeDefinitions(Project.java:942)
  |     at 
org.apache.tools.ant.types.AbstractFileSet.getDataTypeName(AbstractFileSet.java:309)
  |     at 
org.apache.tools.ant.types.AbstractFileSet.setupDirectoryScanner(AbstractFileSet.java:374)
  |     at 
org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:350)
  |     at 
org.apache.tools.ant.taskdefs.MatchingTask.getDirectoryScanner(MatchingTask.java:186)
  |     at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:752)
  |     at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:382)
  |     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
  |     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
  |     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
  |     at 
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
  |     at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
  |     at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
  |     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
  |     at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
  |     at 
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)
  |     at 
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:261)
  |     at 
org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:237)
  |     at 
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:300)
  |     at 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)
  |     at 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
  |     at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
  |     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
  |     at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
  |     at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:66)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:54)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  |     at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
  |     at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
  |     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
  |     at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
  |     at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
  |     at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
  |     at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
  |     at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
  |     at java.lang.Thread.run(Thread.java:534)
  | 

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