Sample: Show/Hide Error Detail
Demonstration:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 118 in the jsp file: /main_header.jsp
Generated servlet error:
[javac] Compiling 1 source file
/work/Catalina/localhost/ashkelon/org/apache/jsp/main_005fheader_jsp.java:210: ')' expected
if ("/search.jsp".equals(request.getServletPath()) {
^
1 error
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:553)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
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.doInclude(ApplicationDispatcher.java:636)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:546)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:1002)
at org.apache.jsp.search_jsp._jspService(search_jsp.java:84)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
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.ashkelon.pages.FlowController.doPost(FlowController.java:240)
at org.ashkelon.pages.FlowController.doGet(FlowController.java:140)
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 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:552)
Description:
A simple and elegant way to display a JSP (or other) Error Page. The details of an error message are hidden from the end user and can be made visibile by clicking on a "Show Details" button. In this case the hidden details is a stack trace (which is useful only to the program's developer, not its end user). I find this form of error display a little more palatable and not so much "in one's face," so to speak. This has often been used/seen in desktop applications.