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https://issues.apache.org/activemq/browse/CAMEL-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61391#action_61391
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John Ellis commented on CAMEL-3077:
-----------------------------------
If it helps, steps to reproduce:
1) Set timeToLiveSeconds to something like 30 seconds
2) Add an entry in a route
3) Wait 30-ish seconds
4) Attempt to make several GETs around the expiry time. One will likely result
in an NPE as the entry is being removed by the EhCache monitor
> Cache Component needs to check for null values during GET operations
> --------------------------------------------------------------------
>
> Key: CAMEL-3077
> URL: https://issues.apache.org/activemq/browse/CAMEL-3077
> Project: Apache Camel
> Issue Type: Bug
> Affects Versions: 2.4.0
> Environment: Received 2.4.0 release of Camel and Camel Cache
> component from Maven repo
> Reporter: John Ellis
> Attachments: CacheProducer.NPE.patch
>
>
> EhCache often has a bit of lag time when invalidating expired cache elements,
> first setting the Element value to null and then removing the key. If you are
> hitting a cache rapidly one often will run across a key that is present in
> the cache that still has a null element entry.
> The logic for successfully key retrieval just needs to be slightly tweaked to
> check for null values.
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