Question

我有一个执行jmx get任务的ant脚本：

<jmx:get
                name="java.lang:type=GarbageCollector,name=Copy" 
                attribute="LastGcInfo"
                resultproperty="CopyLastGcInfo"
                />

现在，LastGcInfo属性有一个名为memoryUsageBeforeGC的地图Map。在这张地图中，有一对称为“值”的键。 Althoug我无法引出它并将其打印出来。我试图像那样完成它：

    <echo>${CopyLastGcInfo.memoryUsageBeforeGc.value.used}</echo>
    <echo>${CopyLastGcInfo.memoryUsageBeforeGc.0.used}</echo>
    <echo>${CopyLastGcInfo.memoryUsageBeforeGc.used}</echo>

那不起作用。您对如何解决这个问题有什么建议吗？

感谢。

Answer 1

以下示例适用于我：

<project name="Catalina Ant JMX" xmlns:jmx="antlib:org.apache.catalina.ant.jmx" default="jmx">

    <target name="jmx" description="Show JMX stats">
        <jmx:open host="localhost" port="9012" username="controlRole" password="tomcat"/>

        <jmx:get name="java.lang:type=GarbageCollector,name=Copy" 
                 attribute="LastGcInfo"
                 resultproperty="CopyLastGcInfo"
                 echo="false"
                 />

        <echo>
        memoryUsageBeforeGc
        ===================
        Perm Gen.used=${CopyLastGcInfo.memoryUsageBeforeGc.Perm Gen.used}
        Tenured Gen.used=${CopyLastGcInfo.memoryUsageBeforeGc.Tenured Gen.used}
        Eden Space.used=${CopyLastGcInfo.memoryUsageBeforeGc.Eden Space.used}
        Code Cache.used=${CopyLastGcInfo.memoryUsageBeforeGc.Code Cache.used}
        Survivor Space.used=${CopyLastGcInfo.memoryUsageBeforeGc.Survivor Space.used}
        </echo>
    </target>

</project>

示例输出

jmx:
     [echo] 
     [echo]         memoryUsageBeforeGc
     [echo]         ===================
     [echo]         Perm Gen.used=9660888
     [echo]         Tenured Gen.used=8393792
     [echo]         Eden Space.used=4456448
     [echo]         Code Cache.used=2038016
     [echo]         Survivor Space.used=172784
     [echo]

注意

“jmx：query”任务的“echo”属性可用于查看任务创建的ANT属性和值。用于故障排除。

Ant - 打印集合 - 地图

1 个答案: