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https://issues.apache.org/jira/browse/WW-5006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16752129#comment-16752129
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Lukasz Lenart commented on WW-5006:
-----------------------------------
Yes, we have already been informed about that issue and PR is wairing
https://github.com/apache/struts/pull/316
> NullPointerException in ProxyUtil class when accessing static member
> --------------------------------------------------------------------
>
> Key: WW-5006
> URL: https://issues.apache.org/jira/browse/WW-5006
> Project: Struts 2
> Issue Type: Bug
> Components: Value Stack
> Affects Versions: 2.5.20
> Reporter: Sebastian Götz
> Priority: Major
> Fix For: 2.5.21, 2.6
>
>
> In some JSP we access static field (constants) of an interface. The interface
> has scope public and and the fields are public static final.
> When accessing the value of such a field the ValueStack throws a
> NullPointerException here (com.opensymphony.xwork2.util.ProxyUtil), because
> there is actually not object (parameter holds null) when accessing a static
> member:
> {code:java}
> /**
> * Check whether the given object is a proxy.
> * @param object the object to check
> */
> public static boolean isProxy(Object object) {
> Class<?> clazz = object.getClass();
> Boolean flag = isProxyCache.get(clazz);
> if (flag != null) {
> return flag;
> }
> boolean isProxy = isSpringAopProxy(object);
> isProxyCache.put(clazz, isProxy);
> return isProxy;
> }
> {code}
>
> Support to access static members is switched on via struts constant
> {{<constant name="struts.ognl.allowStaticMethodAccess" value="true" />}}
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