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https://issues.apache.org/jira/browse/JEXL-268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16601887#comment-16601887
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Dmitri Blinov commented on JEXL-268:
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About next major release, are you interested in starting a development branch
for something newer that Java6? Java8 is four years old now. We could have some
experimental language stuff to go there without disrupting the current branch,
which could be eventually released as 3.2 for those who need backward
compatibility
> Jexl lambdas as parameters to new Java8 methods
> -----------------------------------------------
>
> Key: JEXL-268
> URL: https://issues.apache.org/jira/browse/JEXL-268
> Project: Commons JEXL
> Issue Type: New Feature
> Affects Versions: 3.1
> Reporter: Dmitri Blinov
> Priority: Minor
>
> Java8 introduced functional interfaces, among them {{Function}} and
> {{BiFunction}} interfaces which are used as parameters to method calls, for
> example, {{Map.computeIfAbsent()}} or {{Map.computeIfPresent()}}. In Jexl we
> have lambdas which in theory are good candidates to construct a {{Function}}
> for lambda with one parameter, and a {{BiFunction}} for lambda with two
> parameters.
> The problem is Jexl can not currently support Java8 features and all
> instances of lambda are of single {{internal.Closure}} class, which should
> not try to implement both interfaces at once. One of the solutions, IMO, is
> to have a feature to overload lamda creations to construct custom lambda
> classes without shaking Jexl code tree.
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