[CAMEL-11266] The ehcache component creates a separate CacheManager per producer route

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.19.0
• Fix Version/s: 2.20.0
• Component/s: camel-ehcache
• Estimated Complexity: Unknown
• Assignee: Luca Burgazzoli
• Reporter: Marco Santarelli
• Created: 12/May/17 00:01
• Updated: 24/May/17 10:14
• Resolved: 24/May/17 10:14

Description

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.

 <?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>

resulting in:

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