Error creating form bean of class Problem

[Harry Tiu]

Im encountering this problem in struts for several days

18:47:21,954 ERROR [RequestUtils] Error creating form bean of class com.xcare.meta.web.DatabaseForm
java.lang.NoClassDefFoundError: org/apache/struts/action/ActionForm

My struts-config.xml contains:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.0//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_0.dtd">
 
<struts-config>
  <form-beans>
    <form-bean
      name="emptyForm"
      type="com.xcare.servlet.EmptyForm"/>
 
    <form-bean
      name="databaseForm"
      type="com.xcare.meta.web.DatabaseForm"/>
 
    <form-bean
      name="applicationForm"
      type="com.xcare.meta.web.ApplicationForm"/>
  </form-beans>
  <global-forwards>
    <forward name="login" path="/login.jsp" />
    <forward name="error" path="/error.jsp" />
  </global-forwards>
  <action-mappings>
    <action path="/meta/search"
        className="org.apache.struts.action.ActionMapping"
        name="databaseForm"
        type="com.xcare.meta.web.DatabaseAction"
        parameter="java:/@pool@"
        scope="session"
        input="/blank.jsp" >
        <forward name="success" path="/blank.jsp" />
    </action>
    </action-mappings>
</struts-config>

My DatabaseForm.java contains:

package com.xcare.meta.web;
 
import org.apache.struts.action.ActionForm;
 
public class DatabaseForm extends ActionForm{
    private DatabaseStructure[] database;
 
    public DatabaseStructure[] getDatabase() {
        return database;
    }
 
    public void setDatabase(DatabaseStructure[] database) {
        this.database = database;
    }
}
 

My DatabaseAction.java contains:

package com.xcare.meta.web;
 
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
 

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class DatabaseAction extends Action{
 
    public ActionForward load(ActionMapping mapping,
                              ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response){
        return mapping.findForward("success");
    }
}
 

What should I do to fix this?

[Merrill Higginson]

The important part of this error message is:

java.lang.NoClassDefFoundError: org/apache/struts/action/ActionForm

Here are some possible causes of this error:

1- Check to make sure struts.jar is in your WEB-INF/lib directory
2- Check to make sure that the commons-xxx.jar files and the struts.jar file are for the same version of struts, meaning that they all came from the same struts download package.
3- Make sure that there is not another struts.jar or one of the commons-xxx.jar files being loaded by another Class Loader. This could happen if there's a copy of one of these jar files in some common area used by your App Server.

[Harry Tiu]

Here are some possible causes of this error:

1- Check to make sure struts.jar is in your WEB-INF/lib directory [check!]

2- Check to make sure that the commons-xxx.jar files and the struts.jar
file are for the same version of struts, meaning that they all came
from the same struts download package. [check!]

3- Make sure that there is not another struts.jar or one of the commons-xxx.jar
files being loaded by another Class Loader. This could happen if there's a copy
of one of these jar files in some common area used by your App Server. [check!]

>> But Im still encountering the same error. Actually I removed struts.jar in WEB-INF/lib
then I encountered java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
that means my app is only looking at one struts.jar and it is in WEB-INF/lib.

Before I only encountered this:
ERROR [RequestUtils] Error creating form bean of class com.xcare.meta.web.DatabaseAction
java.lang.NoClassDefFoundError: org/apache/struts/action/Action

DatabaseAction extends Action. I found out that my DatabaseAction and other relevant classes were not copied in its package jar file.
After fixing it, I now have two errors:

[RequestUtils] Error creating form bean of class com.xcare.meta.web.DatabaseForm
java.lang.NoClassDefFoundError: org/apache/struts/action/ActionForm

and

ERROR [RequestProcessor] No action instance for path /meta/search could be created
java.lang.NoClassDefFoundError: org/apache/struts/action/Action


Please help

[ June 21, 2006: Message edited by: Harry Tiu ]
[ June 21, 2006: Message edited by: Harry Tiu ]

[Harry Tiu]

I've found the problem and was able to fix it.

The cause of the problem was that I was duplicatedly deploying my classes (DatabaseAction, DatabaseForm) to different jar files that is causing the NoClassDefFound Exception. This is actually fixed in my build.xml.

Thanks Merrill Higginson!