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https://issues.apache.org/struts/browse/WW-3164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46439#action_46439
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Bruce Phillips commented on WW-3164:
------------------------------------
I added to the Jira bug report another example application that demonstrates
the problem. The StrutsExample application is a simple Struts 2 (using 2.1.6)
application that has both normal actions and Portlet actions.
You can also download this example application (an archive of an Eclipse
Dynamic Web Project that uses Maven) at
http://www.brucephillips.name/struts/StrutsExample.zip.
Unzip the example application and the open a command window. Navigate to where
you unzipped the application.
Run "mvn clean" at the command prompt
Run "mvn jetty:run" at the command prompt
When you see the message [INFO] Started Jetty Server open your web browser and
navigate to
http://localhost:8080/StrutsExample/index.jsp
Click on link for normal Struts 2 action and you should see "Hello from Struts
2"
Click on link for Hello from portlet action and you should see "Hello from
Struts 2"
Click on link for Run Run a normal Struts 2 action that loads a JSP with a
search form built using s:form tag and you'll get the exception discussed
earlier.
Type control C in the command prompt window to stop Jetty server
Edit the pom.xml file:
Change the Struts 2 to version 2.0.11
Comment out the dependency on struts2-portlet-plugin
Save the pom.xml file
In command window run "mvn clean" and then "mvn jetty:run"
When you see the message [INFO] Started Jetty Server open your web browser and
navigate to
http://localhost:8080/StrutsExample/index.jsp
Click on link for normal Struts 2 action and you should see "Hello from Struts
2"
Click on link for Hello from portlet action and you should see "Hello from
Struts 2"
Click on link for Run Run a normal Struts 2 action that loads a JSP with a
search form built using s:form tag and you'll see the simple search form built
using the s:form tag
Click on the link Click here to start the search form example as a portlet and
you'll also see the simple search form
It seems that the s:form tag is causing a problem when using the
struts2-portlet-plugin version 2.1.6 with struts 2 core version 2.1.6.
We hope this is fixed in the upcoming release of version 2.1.7 as we would like
to use the current release of Struts 2 to build web applications that can be
used as standalone applications and as portlet within a portlet container.
> Using Struts 2.1.6 Portlet Plugin Causes NullPointerException When Executing
> A Normal Struts 2 Action
> -----------------------------------------------------------------------------------------------------
>
> Key: WW-3164
> URL: https://issues.apache.org/struts/browse/WW-3164
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Portlet
> Affects Versions: 2.1.6
> Environment: Windows XP, JDK 6
> Reporter: Bruce Phillips
> Attachments: Struts2PortletExample.zip
>
>
> Created a Struts 2 web/portlet application with a pom.xml having a dependency
> on struts2-core-2.0.11.2.jar. Works both as a normal web application and as
> a portlet application.
> Changed the dependencies to be struts2-core-2.1.6.jar and
> struts2-portlet-plugin-2.1.6.jar. Running the application as a web
> application in Tomcat 6 or Jetty results in a
> org.apache.jasper.JasperException: java.lang.NullPointerException whenever a
> Struts 2 action is called.
> Removed the dependency on struts2-portlet-plugin-2.1.6.jar and the
> application runs fine as a normal Struts 2 web application.
> You can download an archived Eclipse dynamic web project that uses maven here:
> http://www.brucephillips.name/struts/struts2portletexample.zip
> 1. Unzip the project
> 2. In a command window navigate to where you unzipped the project
> 3. In the root folder for the project run mvn clean
> 4. Then run mvn jetty:run
> 5. Open your browser and go to
> http://localhost:8080/StrutsPortletExample/index.html
> 6. click on the link for add new employee
> 7. You'll get a NullPointerException
> 8. Close Jetty by using Control C
> 9. In the pom.xml file for the project comment out the dependency on Struts
> 2.1.6 Porlet Plugin
> 10. In command window redo mvn clean and then mvn jetty:run
> 11. Open your browser and go to
> http://localhost:8080/StrutsPortletExample/index.html
> 12. click on the link for add new employee and the Struts 2 action will
> execute successfully and you'll get the add employee page
> In Struts 2.0.11 we were able to use both Struts 2 actions and a Struts 2
> portlet in the same web application. Trying to use the new Struts 2.1.6
> Portlet Plugin causes an exception when user clicks on a normal struts 2
> action link.
> Here is the first part of the Exception stack trace as reported by Struts 2:
> Struts Problem Report
> Struts has detected an unhandled exception:
> # Messages: java.lang.NullPointerException
> File: org/apache/struts2/components/UIBean.java
> Line number: 792
> Stacktraces
> org.apache.jasper.JasperException: java.lang.NullPointerException
>
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:418)
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:486)
> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:380)
> javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:389)
>
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
> org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:334)
> org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
>
> org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:154)
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