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Struts portlet on liferay giving Null pointer exception

Ram Charan

Joined: Jun 07, 2008
Posts: 16
Hi All,
I have developed a struts portlet on liferay.

In Web.xml I am including




In portlet.xml i am including

<display-name>Change Password</display-name>

when tried to run I am getting the below exception

Uncaught exception thrown in one of the service methods of the servlet: ChangePassword. Exception thrown : java.lang.NullPointerException
at com.liferay.portlet.StrutsPortlet.include(StrutsPortlet.java:224)
at com.liferay.portlet.StrutsPortlet.doView(StrutsPortlet.java:195)
at com.liferay.portal.kernel.portlet.LiferayPortlet.doDispatch(LiferayPortlet.java:51)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:163)
at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:102)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:989)

My action class is extending com.liferay.portal.struts.PortletAction.

Let me know if I have to make any configuration changes. Thanks in Advance.

Yongming Duan

Joined: May 08, 2006
Posts: 2
hi Ram,

There are two ways to impliment a struts portlet in liferay.

By the way, could you specify which version are you using?

You can see sample-struts-portlet or sample-struts-liferay-portlet.

try get more help and information on liferay forum

and liferay wiki http://wiki.liferay.com
mp mp

Joined: Nov 27, 2008
Posts: 1
Hi Ram,

Even I was facing the same problem while developing a struts-portlet in Liferay until I could surprisingly find mPire-an Autogeneration tool for Liferay. I found this tool quite cool.

You have to just type in the commands to generate a full fledge struts-portlet in Liferay. No single line of code is required in order to generate a full fledge struts-portlet with all this features :

* CRUD operations on entities
* Filter / Search / Sorting on entities
* Pagination with configurable page size
* Lists: Drop-downs, Radio / Check boxes
* Relationship between various entities
* File Uploading & Data encryption options
* Completely AJAX based

You can save your time by using mPire-an Autogeneration tool for Liferay and get into action. You can download mPire from http://www.mpowerglobal.com/web/guest/mpiredownload

I am using this tool and its very helpful in generating portlets in Liferay, it can be used with almost all servers and database
[ November 27, 2008: Message edited by: mp mp ]
Ben Souther

Joined: Dec 11, 2004
Posts: 13410

"mp mp",
Please check your private messages.

Java API J2EE API Servlet Spec JSP Spec How to ask a question... Simple Servlet Examples jsonf
I agree. Here's the link: http://aspose.com/file-tools
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