Using Struts 2.1.6 Portlet Plugin Causes NullPointerException When Executing A
Normal Struts 2 Action
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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
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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