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https://issues.apache.org/struts/browse/WW-3161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46616#action_46616
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Musachy Barroso commented on WW-3161:
-------------------------------------
I18n is tightly coupled with the ValueStack, and as Gustavo said, the
ActionContext (and other things as well) are held in threadlocals, so anything
that uses the ValueStack, ActionContext or Dispacther cannot be used from
another thread.
This is a problem but it can't be fixed without some major refactoring in xwork.
> When using execAndWait interceptor, getText() fails with npe
> (ActionContext.getContext() is null)
> -------------------------------------------------------------------------------------------------
>
> Key: WW-3161
> URL: https://issues.apache.org/struts/browse/WW-3161
> Project: Struts 2
> Issue Type: Bug
> Components: Core Interceptors
> Affects Versions: 2.1.6
> Reporter: Gustavo De Sanctis
> Fix For: 2.1.8
>
>
> I have a simple action that extends ActionSupport and uses the execAndWait
> interceptor.
> In the "execute" method there is a getText("samekey") that fails with:
> java.lang.NullPointerException
>
> com.opensymphony.xwork2.util.LocalizedTextUtil.findText(LocalizedTextUtil.java:318)
>
> com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:191)
>
> com.opensymphony.xwork2.TextProviderSupport.getText(TextProviderSupport.java:106)
> com.opensymphony.xwork2.ActionSupport.getText(ActionSupport.java:80)
> it.test.SimpleAction.execute(SimpleAction.java:10)
> When using the default interceptor stack, it works fine.
> My guess is that as the action context is threadlocal and as the execAndWait
> interceptor creates a new thread to handle the request... this new thread has
> no reference to the action context (infact ActionContext.getContext() returns
> null when using execAndWait)
> Below the data to reproduce the problem:
> *****************************
> ACTION CLASS: it.test.SimpleAction
> *****************************
> package it.test;
> import com.opensymphony.xwork2.ActionContext;
> import com.opensymphony.xwork2.ActionSupport;
> public class SimpleAction extends ActionSupport {
> public String execute(){
> System.out.println(ActionContext.getContext());
> addActionMessage(getText("message.sample","ciao"));
> return SUCCESS;
> }
> }
> ***********************
> Struts config
> ************************
> <action name="simple" class="it.test.SimpleAction">
> <interceptor-ref name="execAndWait" />
> <result name="success">/simple.jsp</result>
> </action>
> ***********************
> simple.jsp
> **********************
> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
> "http://www.w3.org/TR/html4/loose.dtd";>
> <%...@taglib prefix="s" uri="/struts-tags"%>
> <html>
> <head>
> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
> <title>Simple </title>
> </head>
> <body>
> <s:actionmessage/>
> </body>
> </html>
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