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https://issues.apache.org/jira/browse/OFBIZ-6747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16506881#comment-16506881
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Mathieu Lirzin commented on OFBIZ-6747:
---------------------------------------

I am not aware about the whole story and the rationale behind it, but I think 
OFBiz shouldn't depend on non-standard libs like {{ConcurrentLinkedHashMap}} or 
{{Caffeine}}.  The reason is that the framework should depend only the standard 
{{ConcurrentMap}} interface and should let users choose the implementation of 
their choice.

To reduce the number of dependencies OFBiz should use one of the 
implementations from JavaSE by default and  provide a way to plug those more 
performance focused implementations.  A factory or any another configuration 
mechanism would make the job.

> Replace ConcurrentLinkedHashMap by Caffeine
> -------------------------------------------
>
>                 Key: OFBIZ-6747
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-6747
>             Project: OFBiz
>          Issue Type: Task
>            Reporter: Ben Manes
>            Assignee: Jacques Le Roux
>            Priority: Minor
>
> Similar to OFBIZ-3779, please consider upgrading the library used by 
> [UtilCache|https://github.com/apache/ofbiz/blob/trunk/framework/base/src/org/ofbiz/base/util/cache/UtilCache.java]
>  (v1.2). The current version is 1.4.2 and is the last major release planned.
> The preferable alternative would be to upgrade to 
> [Caffeine|https://github.com/ben-manes/caffeine]. This is a Java 8 rewrite 
> based on what I've learned since developing CLHM and Guava's cache. As 
> expected it provides [superior 
> performance|https://github.com/ben-manes/caffeine/wiki/Benchmarks]. It also 
> provides a [near 
> optimal|https://github.com/ben-manes/caffeine/wiki/Efficiency] eviction 
> policy.



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