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Null pointer exception at _jspx_th_html_form_0.doStartTag()

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I am pretty new to Struts. I am using WSAD and RAD as IDE. While running the application locally, I got null pointer exception in JSP.

I traced to the servlet generated code where it gives Null pointer exception and it points to the below line marked in RED color.

int _jspx_eval_html_form_0 = _jspx_th_html_form_0.doStartTag();
and the corresponding JSP code maps to the below lines.

<html:form action="">
<html:hidden property="reqParam"/>
<html:submit styleClass="buttonText" style="background-color: #6b78a9; color: white;font-weight: bold; font-size:11;font-family: Verdana;">Show All</html:submit>

The same code is working good in QA environment.

I am not sure, whether am i missing any libraries.

Any help appreciated!

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