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cannot cast org apache struts action.Action?

 
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Hi everyone:
I have wrote two javabean for struts.One is LogonForm and another is LogonAction.But I really don't know whether Jdk1.3 support struts1.0.Compiler report error When I compile the LogonAction and it says:"LogonAction.java: Error #: 364 : cannot cast org.apache.struts.action.ActionForm to app.LogonForm at line 13, column 34
".It point to "String username=((LogonForm)form).getUsername();".Why this? I have already added the struts.jar to classpath and my compiler.Struts examples run successfully under Tomcat4.Can anyone help me?
 
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Moving to Java Frameworks forum...
 
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Did you check if LogonForm extends ActionForm?
 
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