Class Not Found on Occasion but Class Exists and is Usually Found

[Michael McGrady]

I have a taglib and the resultant relevant code in _blah_blah_jsp.java 
is given below.  For some reason I frequently get an 
ClassNotFoundException on com.crackwillow.tag.ImgTag from this code.  
After the code, I give the error message.  Any idea why this is happening?


 private boolean 
_jspx_meth_crackwillow_img_0(javax.servlet.jsp.PageContext pageContext)
         throws Throwable {
   JspWriter out = pageContext.getOut();
   /* ----  crackwillow:img ---- */
   com.crackwillow.tag.ImgTag _jspx_th_crackwillow_img_0 = 
(com.crackwillow.tag.ImgTag) 
_jspx_tagPool_crackwillow_img_txtClrCode_size_mapBean_italic_font_button_bold_bgClrCode.get(com.crackwillow.tag.ImgTag.class);
   _jspx_th_crackwillow_img_0.setPageContext(pageContext);
   _jspx_th_crackwillow_img_0.setParent(null);
   _jspx_th_crackwillow_img_0.setButton("browse.gif");
   _jspx_th_crackwillow_img_0.setMapBean("hkc");
   _jspx_th_crackwillow_img_0.setBgClrCode("banRtBgClr");
   _jspx_th_crackwillow_img_0.setTxtClrCode("banRtTxtClr");
   _jspx_th_crackwillow_img_0.setFont("Bookman Old Style");
   _jspx_th_crackwillow_img_0.setItalic("false");
   _jspx_th_crackwillow_img_0.setBold("true");
   _jspx_th_crackwillow_img_0.setSize("15");
   int _jspx_eval_crackwillow_img_0 = 
_jspx_th_crackwillow_img_0.doStartTag();
   if (_jspx_th_crackwillow_img_0.doEndTag() == 
javax.servlet.jsp.tagext.Tag.SKIP_PAGE)
     return true;
   
_jspx_tagPool_crackwillow_img_txtClrCode_size_mapBean_italic_font_button_bold_bgClrCode.reuse(_jspx_th_crackwillow_img_0);
   return false;
 }

ApplicationDispatcher[] Servlet.service() for servlet jsp threw exception
java.lang.NoClassDefFoundError: com.crackwillow.tag.ImgTag
   at 
org.apache.jsp.eclipse_uploader_content_jsp.class$(eclipse_uploader_content_jsp.java:194)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspx_meth_crackwillow_img_0(eclipse_uploader_content_jsp.java:313)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspService(eclipse_uploader_content_jsp.java:127)
   at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
   at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:750)
   at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:510)
   at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:445)
   at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:359)
   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:743)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at com.crackwillow.filter.GZIPFilter.doFilter(GZIPFilter.java:19)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
   at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
   at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
   at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
   at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
   at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
   at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
   at java.lang.Thread.run(Thread.java:534)

StandardWrapperValve[action]: Servlet.service() for servlet action threw 
exception
java.lang.NoClassDefFoundError: com.crackwillow.tag.ImgTag
   at 
org.apache.jsp.eclipse_uploader_content_jsp.class$(eclipse_uploader_content_jsp.java:194)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspx_meth_crackwillow_img_0(eclipse_uploader_content_jsp.java:313)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspService(eclipse_uploader_content_jsp.java:127)
   at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
   at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:750)
   at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:510)
   at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:445)
   at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:359)
   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:743)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at com.crackwillow.filter.GZIPFilter.doFilter(GZIPFilter.java:19)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
   at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
   at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
   at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
   at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
   at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
   at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
   at java.lang.Thread.run(Thread.java:534)

StandardContext[/manager]Manager: stop: Stopping web application at '/'
StandardContext[/manager]Manager: start: Starting web application at '/'
ApplicationDispatcher[] Servlet.service() for servlet jsp threw exception
java.lang.NoClassDefFoundError: com.crackwillow.tag.ImgTag
   at 
org.apache.jsp.eclipse_uploader_content_jsp.class$(eclipse_uploader_content_jsp.java:194)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspx_meth_crackwillow_img_0(eclipse_uploader_content_jsp.java:313)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspService(eclipse_uploader_content_jsp.java:127)
   at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
   at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:750)
   at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:510)
   at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:445)
   at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:359)
   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:743)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at com.crackwillow.filter.GZIPFilter.doFilter(GZIPFilter.java:19)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
   at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
   at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
   at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
   at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
   at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
   at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
   at java.lang.Thread.run(Thread.java:534)

StandardWrapperValve[action]: Servlet.service() for servlet action threw 
exception
java.lang.NoClassDefFoundError: com.crackwillow.tag.ImgTag
   at 
org.apache.jsp.eclipse_uploader_content_jsp.class$(eclipse_uploader_content_jsp.java:194)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspx_meth_crackwillow_img_0(eclipse_uploader_content_jsp.java:313)
   at 
org.apache.jsp.eclipse_uploader_content_jsp._jspService(eclipse_uploader_content_jsp.java:127)
   at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
   at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:750)
   at 
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:510)
   at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:445)
   at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:359)
   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:743)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at com.crackwillow.filter.GZIPFilter.doFilter(GZIPFilter.java:19)
   at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233)
   at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
   at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
   at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
   at 
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
   at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
   at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
   at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
   at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
   at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
   at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
   at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
   at java.lang.Thread.run(Thread.java:534)

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