ActiveMQ 出现FixedBackOff 异常一直出现无限制的连接导致资源占用异常

2017-10-16 09:45:33,809 ERROR [org.springframework.jms.listener.DefaultMessageListenerContainer] - Could not refresh JMS Connection for destination 'topic://SOMC_OKH_TOPIC' - retrying using FixedBackOff{interval=5000, currentAttempts=3, maxAttempts=unlimited}. Cause: Could not connect to broker URL: tcp://192.168.170.84:61616. Reason: java.net.ConnectException: Connection refused: connect

     在做消息队列时出现连接服务器一直拒绝的情况，程序在后台出现了无限制的请求连接，导致资源不停的在访问，占用资源出现异常情况，从异常情况看 - retrying using FixedBackOff{interval=5000, currentAttempts=3, maxAttempts=unlimited}. 看出maxAttempts这个参数出现无限制的情况。根据FixedBackOff类去查看

package org.springframework.util.backoff;/** * A simple {@link BackOff} implementation that provides a fixed interval * between two attempts and a maximum number of retries. * * @author Stephane Nicoll * @since 4.1 */public class FixedBackOff implements BackOff {/** * The default recovery interval: 5000 ms = 5 seconds. */public static final long DEFAULT_INTERVAL = 5000;/** * Constant value indicating an unlimited number of attempts. */public static final long UNLIMITED_ATTEMPTS = Long.MAX_VALUE;private long interval = DEFAULT_INTERVAL;private long maxAttempts = UNLIMITED_ATTEMPTS;/** * Create an instance with an interval of {@value #DEFAULT_INTERVAL} * ms and an unlimited number of attempts. */public FixedBackOff() {}/** * Create an instance. * @param interval the interval between two attempts * @param maxAttempts the maximum number of attempts */public FixedBackOff(long interval, long maxAttempts) {this.interval = interval;this.maxAttempts = maxAttempts;}/** * Set the interval between two attempts in milliseconds. */public void setInterval(long interval) {this.interval = interval;}/** * Return the interval between two attempts in milliseconds. */public long getInterval() {return interval;}/** * Set the maximum number of attempts in milliseconds. */public void setMaxAttempts(long maxAttempts) {this.maxAttempts = maxAttempts;}/** * Return the maximum number of attempts in milliseconds. */public long getMaxAttempts() {return maxAttempts;}@Overridepublic BackOffExecution start() {return new FixedBackOffExecution();}private class FixedBackOffExecution implements BackOffExecution {private long currentAttempts = 0;@Overridepublic long nextBackOff() {this.currentAttempts++;if (this.currentAttempts <= getMaxAttempts()) {return getInterval();}else {return STOP;}}@Overridepublic String toString() {final StringBuilder sb = new StringBuilder("FixedBackOff{");sb.append("interval=").append(FixedBackOff.this.interval);String attemptValue = (FixedBackOff.this.maxAttempts == Long.MAX_VALUE ?"unlimited" : String.valueOf(FixedBackOff.this.maxAttempts));sb.append(", currentAttempts=").append(this.currentAttempts);sb.append(", maxAttempts=").append(attemptValue);sb.append('}');return sb.toString();}}}

需要设置maxAttempts的值，在spring 集成中配置

   <bean  id="backOff" class="org.springframework.util.backoff.FixedBackOff">        <property name="maxAttempts" value="3"/>    </bean>

在监听器中配置该属性backOff 即可

   <bean id="queueListenerContainer"          class="org.springframework.jms.listener.DefaultMessageListenerContainer">        <property name="connectionFactory" ref="connectionFactory" />        <property name="destination" ref="demoTopicDestination" />        <property name="messageListener" ref="topicMessageListen" />        <property name="backOff" ref="backOff"/>        <property name="sessionAcknowledgeMode" value="4"/>    </bean>

结果出现连接不上的只有尝试连接3次

2017-10-16 09:45:33,809 ERROR [org.springframework.jms.listener.DefaultMessageListenerContainer] - Could not refresh JMS Connection for destination 'topic://SOMC_OKH_TOPIC' - retrying using FixedBackOff{interval=5000, currentAttempts=3, maxAttempts=3}. Cause: Could not connect to broker URL: tcp://192.168.170.84:61616. Reason: java.net.ConnectException: Connection refused: connect