我准备了一个带有嵌入式Artemis代理的java应用程序。它是包含所有依赖项的单个jar。我使用org.apache.activemq:artemis-server:2.10.1并以以下方式启动broker:
new EmbeddedActiveMQ().setConfigResourcePath( config ).start();
其中config是配置文件的URL。我使用一个配置文件作为主配置文件，一个配置文件作为从配置文件。
主:
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<configuration xmlns="urn:activemq" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:activemq /schema/artemis-server.xsd">
<core xmlns="urn:activemq:core">
<persistence-enabled>true</persistence-enabled>
<security-enabled>false</security-enabled>
<acceptors>
<acceptor name="netty-acceptor">tcp://127.0.0.1:61617</acceptor>
</acceptors>
<bindings-directory>artemis/bindings</bindings-directory>
<journal-directory>artemis/journal</journal-directory>
<address-settings>
<address-setting match="#">
<dead-letter-address>DLQ</dead-letter-address>
</address-setting>
</address-settings>
<addresses>
<address name="DLQ">
<anycast>
<queue name="DLQ"/>
</anycast>
</address>
</addresses>
<connectors>
<!-- Connector used to be announced through cluster connections and notifications -->
<connector name="artemis">tcp://127.0.0.1:61617</connector>
</connectors>
<cluster-user>artemis-cluster</cluster-user>
<cluster-password>artemis-cluster</cluster-password>
<broadcast-groups>
<broadcast-group name="bg-group1">
<group-address>231.7.7.7</group-address>
<group-port>9876</group-port>
<broadcast-period>5000</broadcast-period>
<connector-ref>artemis</connector-ref>
</broadcast-group>
</broadcast-groups>
<discovery-groups>
<discovery-group name="dg-group1">
<group-address>231.7.7.7</group-address>
<group-port>9876</group-port>
<refresh-timeout>10000</refresh-timeout>
</discovery-group>
</discovery-groups>
<cluster-connections>
<cluster-connection name="my-cluster">
<address></address>
<connector-ref>artemis</connector-ref>
<message-load-balancing>ON_DEMAND</message-load-balancing>
<max-hops>1</max-hops>
<discovery-group-ref discovery-group-name="dg-group1"/>
</cluster-connection>
</cluster-connections>
<ha-policy>
<replication>
<master/>
</replication>
</ha-policy>
</core>
</configuration>
奴隶:
<core xmlns="urn:activemq:core">
<persistence-enabled>true</persistence-enabled>
<security-enabled>false</security-enabled>
<acceptors>
<acceptor name="netty-acceptor">tcp://127.0.0.1:61618</acceptor>
</acceptors>
<bindings-directory>artemis/bindings</bindings-directory>
<journal-directory>artemis/journal</journal-directory>
<address-settings>
<address-setting match="#">
<dead-letter-address>DLQ</dead-letter-address>
</address-setting>
</address-settings>
<addresses>
<address name="DLQ">
<anycast>
<queue name="DLQ"/>
</anycast>
</address>
</addresses>
<connectors>
<!-- Connector used to be announced through cluster connections and notifications -->
<connector name="artemis">tcp://127.0.0.1:61618</connector>
</connectors>
<cluster-user>artemis-cluster</cluster-user>
<cluster-password>artemis-cluster</cluster-password>
<broadcast-groups>
<broadcast-group name="bg-group1">
<group-address>231.7.7.7</group-address>
<group-port>9876</group-port>
<broadcast-period>5000</broadcast-period>
<connector-ref>artemis</connector-ref>
</broadcast-group>
</broadcast-groups>
<discovery-groups>
<discovery-group name="dg-group1">
<group-address>231.7.7.7</group-address>
<group-port>9876</group-port>
<refresh-timeout>10000</refresh-timeout>
</discovery-group>
</discovery-groups>
<cluster-connections>
<cluster-connection name="my-cluster">
<address></address>
<connector-ref>artemis</connector-ref>
<message-load-balancing>ON_DEMAND</message-load-balancing>
<max-hops>1</max-hops>
<discovery-group-ref discovery-group-name="dg-group1"/>
</cluster-connection>
</cluster-connections>
<ha-policy>
<replication>
<slave/>
</replication>
</ha-policy>
</core>
它在Windows 10和Centos 7上正常工作。它不能在Oracle Linux 7上工作。所有机器使用相同的Java版本。
java -version
openjdk version "11.0.9" 2020-10-20
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.9+11)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.9+11, mixed mode)
在Windows和Centos上没有任何异常，我看到以下日志:
11:14:30.867 [Thread-0] INFO org.apache.activemq.artemis.core.server - AMQ221025: Replication: sending NIOSequentialFile...
和
11:14:33.911 [Thread-1 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@2a3c96e3)] INFO org.apache.activemq.artemis.core.server - AMQ221031: backup announced
完全相同的jar和配置文件在Oracle Linux上抛出异常:
11:31:56.074 [Thread-0 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@63b1d4fa)] WARN org.apache.activemq.artemis.core.client - AMQ212025: did not connect the cluster connection to other nodes
java.lang.IllegalStateException: java.lang.ClassNotFoundException: org.hornetq.core.remoting.impl.netty.NettyConnectorFactory
at org.apache.activemq.artemis.utils.ClassloadingUtil.newInstanceFromClassLoader(ClassloadingUtil.java:59) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl$2.run(ClientSessionFactoryImpl.java:996) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl$2.run(ClientSessionFactoryImpl.java:993) ~[broker.jar:?]
at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.instantiateConnectorFactory(ClientSessionFactoryImpl.java:993) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.<init>(ClientSessionFactoryImpl.java:181) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:798) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:655) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:637) ~[broker.jar:?]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl$4.run(ServerLocatorImpl.java:595) ~[broker.jar:?]
at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:42) ~[broker.jar:?]
at org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:31) ~[broker.jar:?]
at org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:66) ~[broker.jar:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) [broker.jar:?]
Caused by: java.lang.ClassNotFoundException: org.hornetq.core.remoting.impl.netty.NettyConnectorFactory
at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) ~[?:?]
at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
at org.apache.activemq.artemis.utils.ClassloadingUtil.newInstanceFromClassLoader(ClassloadingUtil.java:55) ~[broker.jar:?]
... 15 more
主从都抛出相同的异常。为什么Artemis要在Oracle Linux上使用org.hornetq.core.remoting.impl.netty.NettyConnectorFactory?我在Windows上调试了我的应用程序，并在那里使用了org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnectorFactory。在哪里可以配置它?也许在用户目录中有一些配置文件?也许我可以通过将hornetq添加到依赖项来解决这个问题，但我更喜欢使用Artemis的NettyConnectorFactory。我不明白为什么一台机器使用不同的netttyconnectorfactory比其他两台机器。
这几乎肯定是由网络上的HornetQ代理引起的，该代理使用相同的group-address和group-port(即231.7.7.7:9876)来广播其连接器信息。您使用的是默认值，所以这并不奇怪。您应该找到这个HornetQ代理并停止它，或者更改Artemis的集群配置以使用不同的group-address和/或group-port。