<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:${activemq.conf}/credentials.properties</value>        </property>    </bean>   <!-- Allows accessing the server log -->    <bean id="logQuery" class="org.fusesource.insight.log.log4j.Log4jLogQuery"          lazy-init="false" scope="singleton"          init-method="start" destroy-method="stop">    </bean>    <!--        The <broker> element is used to configure the ActiveMQ broker.    -->    <broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${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            <kahaDB directory="${activemq.data}/kahadb"/>        -->        <persistenceAdapter>            <jdbcPersistenceAdapter dataDirectory="${activemq.base}/data" dataSource="#derby-ds"/>        </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&amp;wireFormat.maxFrameSize=104857600"/>            <transportConnector name="amqp" uri="amqp://0.0.0.0:5672?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>            <transportConnector name="stomp" uri="stomp://0.0.0.0:61613?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>            <transportConnector name="mqtt" uri="mqtt://0.0.0.0:1883?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>            <transportConnector name="ws" uri="ws://0.0.0.0:61614?maximumConnections=1000&amp;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>  <bean id="derby-ds" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>    <property name="url" value="jdbc:mysql://localhost/activemq?relaxAutoCommit=true"/>    <property name="username" value="root"/>    <property name="password" value=""/>    <property name="maxActive" value="200"/>    <property name="poolPreparedStatements" value="true"/>  </bean>    <!--        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 -->