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From: bugzilla@apache.org
To: tomcat-dev@jakarta.apache.org
Subject: DO NOT REPLY [Bug 39966]  New:  - Class Cast Exception
 inTagHandlerPool
Message-ID: <bug-39966-78@http.issues.apache.org/bugzilla/>
Date: Wed,  5 Jul 2006 12:13:37 +0000 (GMT)

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http://issues.apache.org/bugzilla/show_bug.cgi?id=39966

           Summary: Class Cast Exception inTagHandlerPool
           Product: Tomcat 5
           Version: 5.5.17
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: nikolaymetchev@gmail.com


I have written a Custom tag which extends SimpleTagSupport. I am getting a very
spurious error occuring very rarely.

If I have a JSP page which is very simple and just uses the custom tag itself
then everything works as expected. However in a more complicated application I
get the exception below. I am curious under what circumstances does the
TagHandlerPool get used instead of just instantiating the tag class directly?
Should it be checking to see if it is a SimpleTag and converting it using a
TagAdapter on line 116?


java.lang.ClassCastException: com.teamphone.common.jsp.image.ImageTag
	at org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:116)
	at
org.apache.jsp.WEB_002dINF.views.default_.authentication.LogonRenderer_jspx._jspx_meth_image_image_0(LogonRenderer_jspx.java:373)
	at
org.apache.jsp.WEB_002dINF.views.default_.authentication.LogonRenderer_jspx._jspService(LogonRenderer_jspx.java:140)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
	at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
	at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
	at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
	at
com.teamphone.common.servlet.http.HttpDocumentFactory$ForwardDocument.writeBody(HttpDocumentFactory.java:329)
	at
com.teamphone.common.servlet.http.HttpDocumentFactory$AbstractDocument.write(HttpDocumentFactory.java:200)
	at com.teamphone.common.servlet.http.HttpServlet.doRequest(HttpServlet.java:173)
	at com.teamphone.common.servlet.http.HttpServlet.doGet(HttpServlet.java:100)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:595)

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