Using Interceptor with Annotation in Struts2 with Spring and Convention Plugin

Question

I have been trying to use interceptor with annotation in struts2 to handle my request and responses so that I can perform some pre and post actions.

But, I have used struts 2 with convention plugin initially which I can't really change. My framework also include spring in it.

But, now problem is whenever I have been trying to use interceptor as annotation in action it gives me following exception at the start of application.

SEVERE: Exception starting filter struts2
Unable to load configuration. - [unknown location]
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:483)
....
Caused by: Unable to load configuration. - [unknown location]
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
.....
Caused by: Unable to find interceptor class referenced by ref-name mylogging - [unknown location]

My code structure is quite simple:

Action class seems like:

@InterceptorRefs({  
    @InterceptorRef("mylogging")  
}) 
    public class LoginAction implements ModelDriven{
.....
    @Action(value="/login",results={@Result(name="success",location="/jsp/successPage.jsp"),
                @Result(name="login",location="/jsp/userLogin.jsp")})
        public String execute() {
....

Struts.xml:

<struts>
    <constant name="struts.devMode" value="true" />
    <constant name="struts.ui.theme" value="simple" />
    <constant name="struts.enable.SlashesInActionNames" value="true" />
    <constant name="struts.mapper.alwaysSelectFullNamespace" value="false"/>
    <package  name="default"  namespace="" extends="struts-default">


     <interceptors>
            <interceptor name="mylogging" 
                class="com.lab.interceptor.LoggingInterceptor">
            </interceptor>
            <interceptor-stack name="loggingStack">
                <interceptor-ref name="mylogging" />
                <interceptor-ref name="defaultStack" />
            </interceptor-stack>
        </interceptors>
    </package>
</struts>

My deployment descriptor body (web.xml):

  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>
        org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
    </filter-class>
    <init-param>
            <param-name>actionPackages</param-name>
            <param-value>com.lab.actions</param-value>
        </init-param>
  </filter>


  <filter-mapping>

    <filter-name>struts2</filter-name>
    <url-pattern>*.action</url-pattern>
  </filter-mapping>
  <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/resources/config/SpringBeans.xml</param-value>
</context-param>

   <listener>
    <listener-class>
      org.springframework.web.context.ContextLoaderListener
    </listener-class>

  </listener>

Now hopefully it will help to figure out why it's throwing that exception, because i don't think I need to remove implementation of ModelDriven from my action.

Thanks in Advance

Answer 1

By default the Convention plugin uses its own package convention-default which doesn't contain your package defined in struts.xml. To change that you have two options, both described in the docs [1]:

• use @ParentPackage annotation
• or define <constant name="struts.convention.default.parent.package" value="default"/> in struts.xml

[1] http://struts.apache.org/development/2.x/docs/convention-plugin.html#ConventionPlugin-ParentPackageannotation