我一直在网上寻找一种解决方案，但是找不到解决ehcache复制问题的方法。我在2台服务器（服务器1 = {A.A.A.A和服务器2 = B.B.B.B）之间使用手动rmi复制，但出现此错误：
2018-09-04 00:07:40,517 DEBUG [ehcache.distribution.RMICacheManagerPeerProvider] (req:) (Replication Thread:null) Lookup URL //B.B.B.B:40000/AddressDao
2018-09-04 00:07:40,522 WARN [ehcache.distribution.RMIAsynchronousCacheReplicator] (req:) (Replication Thread:null) Unable to send message to remote peer. Message was: no such object in table
java.rmi.NoSuchObjectException: no such object in table
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:283)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:260)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
at net.sf.ehcache.distribution.RMICachePeer_Stub.send(Unknown Source)
at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.writeReplicationQueue(RMIAsynchronousCacheReplicator.java:314)
at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.replicationThreadMain(RMIAsynchronousCacheReplicator.java:127)
at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator.access$000(RMIAsynchronousCacheReplicator.java:58)
at net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator$ReplicationThread.run(RMIAsynchronousCacheReplicator.java:389)
ehcache.xml文件如下所示：
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd">
<cacheManagerEventListenerFactory
class=""
properties=""/>
<cacheManagerPeerProviderFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
properties="peerDiscovery=manual"
propertySeparator="," />
<cacheManagerPeerListenerFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"
properties="port=40000,remoteObjectPort=40001,hostName=A.A.A.A" />
<defaultCache
maxElementsInMemory="10000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="false"
diskSpoolBufferSizeMB="30"
maxElementsOnDisk="10000000"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
memoryStoreEvictionPolicy="LRU"
/>
</ehcache>
RMI服务器已为ehcache 2.5及更高版本配置了Spring：
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation" value="classpath:ehcache.xml"/>
<property name="shared" value="false"/>
<property name="acceptExisting" value="true"/>
</bean>
<bean id="mbeanServer" class="org.springframework.jmx.support.MBeanServerFactoryBean">
<property name="locateExistingServerIfPossible" value="true"/>
</bean>
要创建缓存，请参见以下代码段：
final CacheManager cm = CacheManager.create();
_cache = cm.getCache(getName()); // If the cache is configured in the ehcache XML
if (_cache == null) {
final int maxElements = NumbersUtil.parseInt(value, 0);
final int live = NumbersUtil.parseInt((String)params.get("cache.time.to.live"), 300);
int idle = NumbersUtil.parseInt((String)params.get("cache.time.to.idle"), 300);
if (live > 0 && idle > live) {
idle = live;
}
_cache = new Cache(getName(), maxElements, false, live == 0, live, idle);
// Check if replication is enabled and add the replication if needed
final CacheManagerPeerListener cacheManagerPeerListener = cm.getCachePeerListener("RMI");
final CacheManagerPeerProvider cmPeerProvider = cm.getCacheManagerPeerProvider("RMI");
if (cacheManagerPeerListener != null && cmPeerProvider != null) {
_cache.getCacheEventNotificationService().registerListener(new RMIAsynchronousCacheReplicator(false, false, true, false, true, 1000, 1000));
}
cm.addCache(_cache);
s_logger.info("Cache created: " + _cache.toString());
}
服务器加入集群时的代码：
public void onServerJoined(List<? extends Server> nodeList, long selfNodeId) {
final CacheManager cm = CacheManager.create();
CacheManagerPeerProvider peerProvider = cm.getCacheManagerPeerProvider("RMI");
if (peerProvider != null) {
for (Server host : nodeList) {
if (selfNodeId == host.getId()) {
continue;
}
for (String cacheName : cm.getCacheNames()) {
final String peerUrl = "//" + host.getServiceIP() + ":40000/" + cacheName;
peerProvider.registerPeer(peerUrl);
}
}
}
}
使用此Java code，可以列出缓存：
$ java RmiPortNamesDisplay A.A.A.A 40000
Names bound to RMI registry at host A.A.A.A and port 40000:
AddressDao
$ java RmiPortNamesDisplay B.B.B.B 40000
Names bound to RMI registry at host B.B.B.B and port 40000:
AddressDao
在每个服务器的防火墙上打开了端口40000和400001。
在使用ehcache JMX管理器时，如果我从缓存中删除所有条目，则会引发异常（在顶部），并且不会在另一台服务器上清除缓存。
有人遇到了这个问题或有解决方案的提示吗？
答案 0 :(得分：0)
我终于找到了导致此问题的原因。 JVM是从-Djava.rmi.server.hostname=127.0.0.1开始的，它不允许RMI服务器正确绑定。您可以删除该参数，也可以将其设置为ehcache用于复制的IP。