ClassCastException in JSP?!!

[Nicolas Flammel]

java.lang.ClassCastException
at org.apache.struts.util.RequestUtils.retrieveMessageResources(RequestUtils.java:1089)
at org.apache.struts.util.RequestUtils.message(RequestUtils.java:1043)
at org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:294)
at _jsp._ttsendmessage__jsp._jspService(C:\resin-2.1.10\webapps\xoraapps\jsp\TTSendMessage.jsp:9)
at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
at com.caucho.jsp.Page.subservice(Page.java:506)
at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:222)
at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:103)
at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:80)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:246)
at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:164)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:534)

Can anybody give a reason for this exception although other jsps with bean tags work fine...???

[Amit Shanker]

Hi Nicolas,

ClassCastException is thrown when your java code cannot find the specified class. That may be because you may not have imported the class or qualified it with the package name.

Hope this helps!

Regards,

Amit.

[forum guest]

I've seen this before. You probably are using the <html:errors> tag, but in you code, you have something like:

errors.add("***", new ActionMessage("***"));

Change ActionMessage to ActionError

[Bear Bibeault]

ClassCastException is thrown when your java code cannot find the specified class.

That is incorrect. In such a case a ClassNotFound exception will be thrown.

A ClassCastException occurs when a cast is performed upon an object to a type which is not in the class hierarchy of an object, or to an unimplemented interface. For example, if an object is of class String, you can cast it to a String, or to an Object (since String extends Object), or to a Comparable (since String implements that interface). But you cannot cast it to a Double or to any other class that it is not one of, not an extension of, or to an interface that it does not implement.
[ June 03, 2004: Message edited by: Bear Bibeault ]

[Dirk Schreckmann]

What code creates this Exception?

Note that if it's JSP-specific code, and not specific to a web application framework, then the JSP forum would be the appropriate place to have this conversation.

[Bear Bibeault]

It looks like it's being thrown from within one of the Struts tags so probably appropriate here.

To the original poster: don't you think that including some context with your stack trace might have been just a tad more useful? Like the tag syntax originating the error, no?