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https://issues.apache.org/jira/browse/JEXL-221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902603#comment-15902603
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Dmitri Blinov commented on JEXL-221:
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Do you think we could also cross-check other Get|SetExecutors for similar bugs?
> Sporadic undefined property error caused by NPE at MapGetExecutor.tryInvoke()
> -----------------------------------------------------------------------------
>
> Key: JEXL-221
> URL: https://issues.apache.org/jira/browse/JEXL-221
> Project: Commons JEXL
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Dmitri Blinov
> Assignee: Henri Biestro
>
> I'm getting sporadic undefined property error when accessing hashmap by a
> key. The stack trace tells the cause is NPE in MapGetExecutor.tryInvoke() at
> the following line:
> {code}
> if (obj != null && method != null
> && objectClass.equals(obj.getClass())
> && (key == null ||
> property.getClass().equals(key.getClass()))) {
> {code}
> I have managed to overcome this issue by adding the following null check:
> {code}
> if (obj != null && method != null
> && objectClass.equals(obj.getClass())
> && (key == null || property != null &&
> property.getClass().equals(key.getClass()))) {
> {code}
> I have only vague understanding of how things work inside jexl with
> tryInvoke() and unfortunately can not provide any test case for this, but it
> has worked in my case, so if nobody have any objections please include the
> fix in source tree.
> Thanks!
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