Here is an open issue in struts2 tiles plugin:
https://issues.apache.org/struts/browse/WW-2762
that is a critical issue for me. I would like to help resolve this
issue, but am not sure about the root cause.
Here is the issue in summary:
If you create a tile definition whose JSP page contains a struts2
<s:form>, and if that tile page inserts a subtile page that contains
form controls, then the page will not render and a NullPointerException
will be thrown from the org.apache.struts2.views.util.UrlHelper class.
Attached to the JIRA is a very small sample that illustrates this issue.
I have run this in the debugger and have found that this line of code
throwing the NPE:
UrlHelper.java:85
// FIXME: temporary hack until class is made a properly injected
bean
Container cont = ActionContext.getContext().getContainer();
The xwork2.ActionContext.getContext() is returning null.
I have also found that in the reproducible test case, that this function
is called twice, once per thread. The first time that it is called
ActionContext.getContext() returns a valid context object and
everything is fine. But in the second invocation, getContext() returns
null.
The actionContext is a ThreadLocal. So somehow the ActionContext's
internal actionContext is null for one of these two threads. I'm not
sure why or what exactly each of these two threads are responsible for.
Any suggestions for correcting this would be appreciated.
Thanks,
John
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