java - EhCache + JGroups 给出 "Exception on flushing of replication queue: null"

Question

我正在尝试使用基于 JGroups 的复制来配置 EhCache，但是当第一个元素被添加到缓存中时，我的日志中出现了以下异常:

12061 [Replication Thread] ERROR net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator - Exception on flushing of replication queue: null. Continuing...
java.lang.NullPointerException
    at net.sf.ehcache.distribution.RMISynchronousCacheReplicator.listRemoteCachePeers(RMISynchronousCacheReplicator.java:335)
    at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.flushReplicationQueue(RMIAsynchronousCacheReplicator.java:299)
    at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.replicationThreadMain(RMIAsynchronousCacheReplicator.java:119)
    at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.access$100(RMIAsynchronousCacheReplicator.java:57)
    at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator$ReplicationThread.run(RMIAsynchronousCacheReplicator.java:371)

ehcache.xml 是这样的:

<?xml version="1.0" encoding="UTF-8"?>       
<ehcache 
  updateCheck="true" 
  monitoring="autodetect"
  defaultTransactionTimeoutInSeconds="30" 
  dynamicConfig="true">

  <cacheManagerPeerProviderFactory
    class="net.sf.ehcache.distribution.jgroups.JGroupsCacheManagerPeerProviderFactory"
    properties="jgroups.xml"
  />

  <defaultCache 
    maxElementsInMemory="200"
    eternal="false"
    statistics="true"
    timeToIdleSeconds="86400"
    timeToLiveSeconds="86400"    
    overflowToDisk="false">    
    <cacheEventListenerFactory
      class="net.sf.ehcache.distribution.RMICacheReplicatorFactory"
      properties="replicateAsynchronously=true, replicatePuts=true, replicateUpdates=true, replicateUpdatesViaCopy=true, replicateRemovals=true"
    />
    <bootstrapCacheLoaderFactory class="net.sf.ehcache.distribution.RMIBootstrapCacheLoaderFactory" />    
  </defaultCache>

</ehcache>

jgroups.xml 是这样的:

<?xml version='1.0'?>
<config>
    <TCP start_port="7800" />
    <TCPPING 
       timeout="3000" 
       initial_hosts="localhost[7800],localhost[7800]"
       port_range="10" 
       num_initial_members="2" />
    <VERIFY_SUSPECT timeout="1500" />
    <pbcast.NAKACK 
       use_mcast_xmit="false"
       gc_lag="100"
       retransmit_timeout="300,600,1200,2400,4800"
       discard_delivered_msgs="true" />
    <pbcast.STABLE
       stability_delay="1000"
       desired_avg_gossip="50000"
       max_bytes="400000" />
    <pbcast.GMS
       print_local_addr="true"
       join_timeout="5000"
       shun="false"
       view_bundling="true" />
</config>

使用 jgroups 版本 2.8.1.GA，ehcache-core 版本 2.5.1，ehcache-jgroupsreplication 版本 1.5。

我做错了什么？

更新:当我更改为 replicateAsynchronously=false 时，出现以下异常:

Exception in thread "main" java.lang.NullPointerException
    at net.sf.ehcache.distribution.RMISynchronousCacheReplicator.listRemoteCachePeers(RMISynchronousCacheReplicator.java:335)
    at net.sf.ehcache.distribution.RMISynchronousCacheReplicator.replicatePutNotification(RMISynchronousCacheReplicator.java:145)
    at net.sf.ehcache.distribution.RMISynchronousCacheReplicator.notifyElementPut(RMISynchronousCacheReplicator.java:132)
    at net.sf.ehcache.event.RegisteredEventListeners.notifyListener(RegisteredEventListeners.java:294)
    at net.sf.ehcache.event.RegisteredEventListeners.invokeListener(RegisteredEventListeners.java:284)
    at net.sf.ehcache.event.RegisteredEventListeners.internalNotifyElementPut(RegisteredEventListeners.java:144)
    at net.sf.ehcache.event.RegisteredEventListeners.notifyElementPut(RegisteredEventListeners.java:122)
    at net.sf.ehcache.Cache.notifyPutInternalListeners(Cache.java:1515)
    at net.sf.ehcache.Cache.putInternal(Cache.java:1490)
    at net.sf.ehcache.Cache.put(Cache.java:1417)
    at net.sf.ehcache.Cache.put(Cache.java:1382)

更新 2:问题是在 Terracota 的 JIRA 中创建的:https://jira.terracotta.org/jira/browse/EHC-927

Answer 1

正如 Chris 在 EHC927 中指出的那样我使用了错误的 cacheEventListenerFactory 类。它应该是 net.sf.ehcache.distribution.jgroups.JGroupsCacheReplicatorFactory 而不是 net.sf.ehcache.distribution.RMICacheReplicatorFactory。