Illegal Field Name Error

[Asad Habib]

I am receiving the following error when trying to run a Struts application. I 
checked and it seems that I do have all of the appropriate jar files installed. 
But for some reason, the Action class is not being recognized. Any help would 
be greatly appreciated. Thank you.

- Asad


HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from 
fulfilling this request.

exception

javax.servlet.ServletException: Illegal field name "has inconsistent hierarchy" 
in class
registration/RegistrationTypeAction

org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:293)

org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
root cause

java.lang.ClassFormatError: Illegal field name "has inconsistent hierarchy" in 
class
registration/RegistrationTypeAction
        java.lang.ClassLoader.defineClass1(Native Method)
        java.lang.ClassLoader.defineClass(ClassLoader.java:620)

java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)

org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1629)

org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:850)

org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1299)

org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)

org.apache.struts.util.RequestUtils.applicationClass(RequestUtils.java:117)

org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:143)

org.apache.struts.action.RequestProcessor.processActionCreate(RequestProcessor.java:280)

org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:218)

org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)

org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        java.lang.reflect.Method.invoke(Method.java:585)

org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
        java.security.AccessController.doPrivileged(Native Method)
        javax.security.auth.Subject.doAsPrivileged(Subject.java:517)

org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)

org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
note The full stack trace of the root cause is available in the Apache 
Tomcat/5.5.9 logs.

Apache Tomcat/5.5.9


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