[jboss-jira] [JBoss JIRA] (WFLY-4405) NPE in AstValue.setValue()

[Christer Bernérus (JIRA)]

     [ https://issues.jboss.org/browse/WFLY-4405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christer Bernérus updated WFLY-4405:
------------------------------------

That will be hard. The app causing this needs a lot of infrastucture to be able to run off-site. 
I can try to put together something simple, however not this week, I'll be too busy and as 
for myself I'm in no hurry. Please let me know if someone else have similar problems though.

-- Chris






> NPE in AstValue.setValue()
> --------------------------
>
>                 Key: WFLY-4405
>                 URL: https://issues.jboss.org/browse/WFLY-4405
>             Project: WildFly
>          Issue Type: Bug
>          Components: JSF
>    Affects Versions: 8.2.0.Final
>         Environment: MacOS X, RHEL6
>            Reporter: Christer Bernérus
>            Assignee: Farah Juma
>
> When submitting a page made up using a custom tag, or a composite component, WildFly reports NPE in AstValue.setValue().
> The code where this happens is in javax.el-3.0.1-b05.jar and looks like this:
> {code:title=AstValue.java|borderStyle=solid}
>  /* Note by kchung 10/2013
>          * The spec does not say if the value should be cocerced to the target
>          * type before setting the value to the target. The conversion is kept
>          * here to be backward compatible.
>          */
>         ctx.setPropertyResolved(false);
>         Class<?> targetType = elResolver.getType(ctx, t.base, property);
>         if (ctx.isPropertyResolved()) {
>             ctx.setPropertyResolved(false);
>             Object targetValue = elResolver.convertToType(ctx, value, targetType);
>             if (ctx.isPropertyResolved()) {
>                 value = targetValue;
>             } else {
>                 if (value != null || targetType.isPrimitive()) {
>                     value = ELSupport.coerceToType(value, targetType);
>                 }
>             }
>         }
> {code}
> From my debugging session, I have seen that the code in
> {{elResolver.getType()}} may return null, which happens to me, 
> but the subsequent code in {{AstValue.setValue()}} happily uses that null valued variable {{targetType}} for calling the method {{isPrimitive()}} which of course causes an NPE.
> Strangely enough, this behaviour seems intermittent in that restarting WildFly might make the bug go away or come back, but redeployment does not.



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