[jira] Commented: (CAMEL-3077) Cache Component needs to check for null values during GET operations

["John Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/activemq/browse/CAMEL-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61391#action_61391 ] 

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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