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From "Yasser Zamani (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (WW-5006) NullPointerException in ProxyUtil class when accessing static member
Date Wed, 20 Feb 2019 09:22:00 GMT

     [ https://issues.apache.org/jira/browse/WW-5006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yasser Zamani resolved WW-5006.
-------------------------------
    Resolution: Fixed

PR got merged. Thanks!

> 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 fields (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 no 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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