问题描述
我需要编写一个程序，在重新启动任务，ActiveMQ和ActiveMQ Web服务后，应检查使用方的数量。服务的重新启动在特定时间使用脚本进行。重新启动后，将在调度程序中配置为任务的程序必须检查使用者的数量。我尝试编写以下程序，但是会抛出：
java.lang.reflect.UndeclaredThrowableException Caused by: javax.management.InstanceNotFoundException: org.apache.activemq:type=broker,brokerName=localhost,destinationType=Queue at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1095)
这有什么问题？
public void getStatistics() throws Exception {
JMXServiceURL jmxServiceURL = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi");
JMXConnector jmxConnector = JMXConnectorFactory.connect(jmxServiceURL,null);
jmxConnector.connect();
MBeanServerConnection serverConnection = jmxConnector.getMBeanServerConnection();
ObjectName objectName = new ObjectName("org.apache.activemq:type=broker," +
"destinationType=Queue");
brokerViewMBean viewMBean = MBeanServerInvocationHandler.newProxyInstance(serverConnection,objectName,brokerViewMBean.class,true);
System.out.println("Statistics for broker " + viewMBean.getbrokerId() + " - " +
viewMBean.getbrokerName());
System.out.println("\n---------------\n");
System.out.println("Total messages count: " + viewMBean.getTotalMessageCount());
System.out.println("Total number of consumers: " + viewMBean.getTotalConsumerCount());
System.out.println("Total number of queues: " + viewMBean.getQueues().length);
for (ObjectName queueName: viewMBean.getQueues()) {
QueueViewMBean queueViewMBean = MBeanServerInvocationHandler.newProxyInstance(serverConnection,queueName,QueueViewMBean.class,true);
System.out.println("\n---------------\n");
System.out.println("Statistics for queue: " + queueViewMBean.getName());
System.out.println("Size: " + queueViewMBean.getQueueSize());
System.out.println("Number of consumers: " + queueViewMBean.getConsumerCount());
}
}
添加了activemq.xml
<!--
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contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License,Version 2.0
(the "License"); you may not use this file except in compliance with
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Unless required by applicable law or agreed to in writing,software
distributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- START SNIPPET: example -->
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">
<!-- Allows us to use system properties as variables in this configuration file -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>file:${activemq.conf}/credentials.properties</value>
</property>
</bean>
<!-- Allows accessing the server log -->
<bean id="logQuery" class="io.fabric8.insight.log.log4j.Log4jLogQuery"
lazy-init="false" scope="singleton"
init-method="start" destroy-method="stop">
</bean>
<!--
The <broker> element is used to configure the ActiveMQ broker.
-->
<broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}">
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry topic=">" >
<!-- The constantPendingMessageLimitStrategy is used to prevent
slow topic consumers to block producers and affect other consumers
by limiting the number of messages that are retained
For more information,see:
http://activemq.apache.org/slow-consumer-handling.html
-->
<pendingMessageLimitStrategy>
<constantPendingMessageLimitStrategy limit="1000"/>
</pendingMessageLimitStrategy>
</policyEntry>
</policyEntries>
</policyMap>
</destinationPolicy>
<!--
The managementContext is used to configure how ActiveMQ is exposed in
JMX. By default,ActiveMQ uses the MBean server that is started by
the JVM. For more information,see:
http://activemq.apache.org/jmx.html
-->
<managementContext>
<managementContext createConnector="false"/>
</managementContext>
<!--
Configure message persistence for the broker. The default persistence
mechanism is the KahaDB store (identified by the kahaDB tag).
For more information,see:
http://activemq.apache.org/persistence.html
-->
<persistenceAdapter>
<kahaDB directory="${activemq.data}/kahadb"/>
</persistenceAdapter>
<!--
The systemUsage controls the maximum amount of space the broker will
use before disabling caching and/or slowing down producers. For more information,see:
http://activemq.apache.org/producer-flow-control.html
-->
<systemUsage>
<systemUsage>
<memoryUsage>
<memoryUsage percentOfJvmHeap="70" />
</memoryUsage>
<storeUsage>
<storeUsage limit="100 gb"/>
</storeUsage>
<tempusage>
<tempusage limit="50 gb"/>
</tempusage>
</systemUsage>
</systemUsage>
<!--
The transport connectors expose ActiveMQ over a given protocol to
clients and other brokers. For more information,see:
http://activemq.apache.org/configuring-transports.html
-->
<transportConnectors>
<!-- DOS protection,limit concurrent connections to 1000 and frame size to 100MB -->
<transportConnector name="openwire" uri="tcp://0.0.0.0:61616?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="stomp" uri="stomp://0.0.0.0:61613?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="mqtt" uri="mqtt://0.0.0.0:1883?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
<transportConnector name="ws" uri="ws://0.0.0.0:61614?maximumConnections=1000&wireFormat.maxFrameSize=104857600"/>
</transportConnectors>
<!-- destroy the spring context on shutdown to stop jetty -->
<shutdownHooks>
<bean xmlns="http://www.springframework.org/schema/beans" class="org.apache.activemq.hooks.SpringContextHook" />
</shutdownHooks>
</broker>
<!--
Enable web consoles,REST and Ajax APIs and demos
The web consoles requires by default login,you can disable this in the jetty.xml file
Take a look at ${ACTIVEMQ_HOME}/conf/jetty.xml for more details
-->
<import resource="jetty.xml"/>
</beans>
<!-- END SNIPPET: example -->
解决方法
根据例外情况，您使用的ObjectName不正确。尝试以下方法：
ObjectName objectName = new ObjectName("org.apache.activemq:type=Broker,brokerName=localhost");