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https://issues.apache.org/jira/browse/CAMEL-11266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012553#comment-16012553
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Luca Burgazzoli commented on CAMEL-11266:
-----------------------------------------
I digged a little into the code and if we configure the cache manager on
component level we'll lose the option to have different endpoint targeting
different ehcache instances so the way to go in camel 2.19.x is to tell the
endpoints to use a pre-configured cache manager using the cacheManager (I've
updated the doc so it should appears soon on the website).
Example:
{code:java}
from("direct:cache")
.to("ehcache:my-cache?cacheManager=#myCacheManager&keyType=java.lang.String&valueType=java.lang.String");
{code}
>From camel 2.20 the camel component will expose some methods to set defaults
>like:
{code:java}
EhcacheComponent ehcache = new EhcacheComponent();
ehcache.getConfiguration().setCacheManager(myCacheManager);
{code}
So if you put an object like that in the camel context/registry, you'll be able
to write your route as:
{code:java}
from("direct:cache")
.to("ehcache:my-cache?keyType=java.lang.String&valueType=java.lang.String");
{code}
> The ehcache component creates a separate CacheManager per producer route
> ------------------------------------------------------------------------
>
> Key: CAMEL-11266
> URL: https://issues.apache.org/jira/browse/CAMEL-11266
> Project: Camel
> Issue Type: Bug
> Components: camel-ehcache
> Affects Versions: 2.19.0
> Reporter: Marco Santarelli
> Assignee: Luca Burgazzoli
> Fix For: 2.20.0
>
>
> The issue becomes clear if the developers declares more than one producer
> route with the attached ehcache config: multiple cache managers start
> contention of file lock and the startup fails.
> {code:xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <ehcache:config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xmlns:ehcache="http://www.ehcache.org/v3";
> xsi:schemaLocation="http://www.ehcache.org/v3
> http://www.ehcache.org/schema/ehcache-core-3.3.xsd";>
> <ehcache:persistence
> directory="${java.io.tmpdir}/ehcache"></ehcache:persistence>
> <ehcache:cache alias="cache1" uses-template="default-template">
> </ehcache:cache>
> <ehcache:cache alias="cache2" uses-template="default-template">
> <ehcache:expiry>
> <ehcache:ttl unit="minutes">60</ehcache:ttl>
> </ehcache:expiry>
> </ehcache:cache>
> <ehcache:cache alias="cache3" uses-template="default-template">
> <ehcache:expiry>
> <ehcache:ttl unit="minutes">1</ehcache:ttl>
> </ehcache:expiry>
> </ehcache:cache>
> <ehcache:cache-template name="default-template">
> <ehcache:key-type>java.lang.String</ehcache:key-type>
> <ehcache:value-type>java.io.Serializable</ehcache:value-type>
> <ehcache:expiry>
> <ehcache:none/>
> </ehcache:expiry>
> <ehcache:resources>
> <ehcache:heap unit="entries">1000</ehcache:heap>
> <ehcache:disk persistent="true" unit="MB">10</ehcache:disk>
> </ehcache:resources>
> </ehcache:cache-template>
> </ehcache:config>
> {code}
> resulting in:
> {code}
> Caused by: org.ehcache.StateTransitionException: Couldn't lock rootDir:
> /var/folders/gf/6psxkr_n7vl_qbhw8mktqqww0000gn/T/ehcache
> at
> org.ehcache.core.StatusTransitioner$Transition.failed(StatusTransitioner.java:235)
> ~[ehcache-3.2.2.jar:3.2.2 892e5c56c2a7100866de90dc7c2099a62fb6198b]
> at org.ehcache.core.EhcacheManager.init(EhcacheManager.java:588)
> ~[ehcache-3.2.2.jar:3.2.2 892e5c56c2a7100866de90dc7c2099a62fb6198b]
> at
> org.apache.camel.component.ehcache.EhcacheManager.start(EhcacheManager.java:66)
> ~[camel-ehcache-2.19.0.jar:2.19.0]
> at
> org.apache.camel.component.ehcache.EhcacheEndpoint.doStart(EhcacheEndpoint.java:65)
> ~[camel-ehcache-2.19.0.jar:2.19.0]
> at
> org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:75)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.processor.SendProcessor.doStart(SendProcessor.java:236)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:75)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:60)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startServices(ServiceHelper.java:104)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startServices(ServiceHelper.java:90)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.processor.RedeliveryErrorHandler.doStart(RedeliveryErrorHandler.java:1447)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.support.ChildServiceSupport.start(ChildServiceSupport.java:44)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.support.ChildServiceSupport.start(ChildServiceSupport.java:31)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:75)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:60)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startServices(ServiceHelper.java:104)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startServices(ServiceHelper.java:90)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.processor.interceptor.DefaultChannel.doStart(DefaultChannel.java:156)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:75)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:60)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startServices(ServiceHelper.java:104)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startServices(ServiceHelper.java:90)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.processor.DelegateAsyncProcessor.doStart(DelegateAsyncProcessor.java:80)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:75)
> ~[camel-core-2.19.0.jar:2.19.0]
> at
> org.apache.camel.impl.RouteService.startChildService(RouteService.java:364)
> ~[camel-core-2.19.0.jar:2.19.0]
> at org.apache.camel.impl.RouteService.doWarmUp(RouteService.java:196)
> ~[camel-core-2.19.0.jar:2.19.0]
> at org.apache.camel.impl.RouteService.warmUp(RouteService.java:145)
> ~[camel-core-2.19.0.jar:2.19.0]
> ... 28 common frames omitted
> {code}
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