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https://issues.apache.org/jira/browse/WW-3848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438109#comment-13438109
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Lukasz Lenart commented on WW-3848:
-----------------------------------
And this happened when I disabled {code:xml}<default-action-ref name="index"
/>{code}, before I was redirected to /index action
> NPE forwarding to tile without an action class
> ----------------------------------------------
>
> Key: WW-3848
> URL: https://issues.apache.org/jira/browse/WW-3848
> Project: Struts 2
> Issue Type: Bug
> Components: Core Actions
> Affects Versions: 2.3.1, 2.3.4
> Reporter: Paul Benedict
> Assignee: Lukasz Lenart
> Fix For: 2.3.5
>
>
> Struts config:
> {noformat}
> <package name="default" namespace="/" extends="struts-default">
> <action name="test">
> <result type="tiles">test.tile</result>
> </action>
> </package>
> {noformat}
> Stack trace:
> {noformat}
> java.lang.NullPointerException
> org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
>
> com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
>
> org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
>
> org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
>
> com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
> {noformat}
> Specifying the Action class makes the exception go away.
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