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https://issues.apache.org/jira/browse/WW-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719339#comment-13719339
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Maurizio Cucchiara commented on WW-4146:
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{quote}
can you determine foo if it is a hash,a hash should not be cached,it is no
sense.
{quote}
[~quaff], please notice that Struts does not cache the content of the map or
the map itself, but only the OGNL expression that point to the property
> cache attack at OgnlUtil.expressions
> -------------------------------------
>
> Key: WW-4146
> URL: https://issues.apache.org/jira/browse/WW-4146
> Project: Struts 2
> Issue Type: Bug
> Components: Expression Language
> Affects Versions: 2.3.15.1
> Reporter: bruce liu
> Fix For: 2.3.17
>
> Attachments: WW-4146.patch
>
>
> in class com.opensymphony.xwork2.ognl.OgnlUtil, code :
> {code:java}
> tree = expressions.get(expression);
> if (tree == null) {
> tree = Ognl.parseExpression(expression);
> expressions.putIfAbsent(expression, tree);
> }
> {code}
> every parameter in the request cached in field expressions which is an
> instances of ConcurrentMap<String, Object>, use parameterName as key. so i
> construct huge different parameters that has different name (like "abc[123],
> abc[124]" ), they all cached in expressions, this cause outofmemory error,
> and let map acted like a list .
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