使用Nashorn javascript jjs查找JMX MBean

Question

我正在嘗試在Catalina / Connector / 8009 / *連接器中更改proxyName的值。 問題是嘗試查找MBean名稱時出現以下異常。

Exception in thread "main" java.lang.ClassCastException: Cannot cast java.lang.String to javax.management.QueryExp
        at java.lang.invoke.MethodHandleImpl.newClassCastException(MethodHandleImpl.java:361)
        at java.lang.invoke.MethodHandleImpl.castReference(MethodHandleImpl.java:356)
        at jdk.nashorn.internal.scripts.Script$jmx_test_jjs.:program(jmx-test.jjs:32)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:636)
        at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:229)
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:387)
        at jdk.nashorn.tools.Shell.apply(Shell.java:394)
        at jdk.nashorn.tools.Shell.runScripts(Shell.java:323)
        at jdk.nashorn.tools.Shell.run(Shell.java:169)
        at jdk.nashorn.tools.Shell.main(Shell.java:133)
        at jdk.nashorn.tools.Shell.main(Shell.java:112)

腳本是：

#! /usr/java/jdk1.8.0_25/bin/jjs
var host="jmxremotehost"
var port=7091
var serviceURL = "service:jmx:rmi:///jndi/rmi://" + host + ":" + port + "/jmxrmi"
var url = new javax.management.remote.JMXServiceURL(serviceURL);

var stringArrayType = Java.type("java.lang.String[]")
var credentials = new stringArrayType(2)
credentials[0]="jmxuser"
credentials[1]="jmxpassword"

var HashMapType = Java.type("java.util.HashMap")
var environment = new HashMapType()
environment.put("jmx.remote.credentials",credentials)
var connector = javax.management.remote.JMXConnectorFactory.connect(url,environment)
var mbeanServerConnection=connector.getMBeanServerConnection()

var ObjectNameType = Java.type("javax.management.ObjectName")

objectName = new ObjectNameType('Catalina:type=Connector,port=8009,*')
print(mbeanServerConnection.queryNames(objectName, "proxyName"), null)

問題是我不知道如何在MBeanServerConnection接口的queryNames（）方法中發送Java null或對第二個參數有效的其他任何內容。 請參閱： http : //docs.oracle.com/javase/7/docs/api/javax/management/MBeanServerConnection.html#queryMBeans%28javax.management.ObjectName,%20javax.management.QueryExp%29

Answer 1

僅使用null對我有效：

print(mbeanServerConnection.queryNames(objectName, null), null)

我整理了一下腳本，並使用平台MBeanServer節省了一些時間：

#! /usr/lib/jvm/jdk1.8.0_45/bin/jjs
var mbeanServerConnection=java.lang.management.ManagementFactory.getPlatformMBeanServer();
var ObjectNameType = Java.type("javax.management.ObjectName")
objectName = new ObjectNameType('*:*')
print(mbeanServerConnection.queryNames(objectName, null), null)

輸出為：

[java.lang：type = MemoryPool，name = Metaspace，java.lang：type = MemoryPool，name = PS Old Gen，java.lang：type = GarbageCollector，name = PS Scavenge，java.lang：type = MemoryPool，name = PS Eden Space，JMImplementation：type = MBeanServerDelegate，java.lang：type = Runtime，java.lang：type = Threading，java.lang：type = OperatingSystem，java.lang：type = MemoryPool，名稱=代碼緩存，java.nio ：type = BufferPool，name = direct，java.lang：type = Compilation，java.lang：type = MemoryManager，name = CodeCacheManager，java.lang：type = MemoryPool，name =壓縮類空間，java.lang：type = Memory ，java.nio：type = BufferPool，名稱=映射，java.util.logging：type = Logging，java.lang：type = MemoryPool，name = PS生存空間，java.lang：type = ClassLoading，java.lang：type = MemoryManager，名稱= Metaspace Manager，com.sun.management:type=DiagnosticCommand，java.lang：type = GarbageCollector，name = PS MarkSweep，com.sun.management:type=HotSpotDiagnostic]

Java版本略新，但我認為這不是問題。

更新資料

嘗試與HBase服務器建立遠程連接，並進行模式搜索以進行更類似的測試：

#! /usr/lib/jvm/jdk1.8.0_45/bin/jjs
var host="njwmintx"
var port=10101
var serviceURL = "service:jmx:rmi:///jndi/rmi://" + host + ":" + port + "/jmxrmi"
var url = new javax.management.remote.JMXServiceURL(serviceURL);
var connector = javax.management.remote.JMXConnectorFactory.connect(url)
var mbeanServerConnection=connector.getMBeanServerConnection()
var ObjectNameType = Java.type("javax.management.ObjectName")
objectName = new ObjectNameType('Hadoop:service=HBase,name=RegionServer,*')
print(mbeanServerConnection.queryNames(objectName, null), null)

輸出為：

[Hadoop：service = HBase，名稱= RegionServer，子=服務器，Hadoop：service = HBase，名稱= RegionServer，子=區域，Hadoop：service = HBase，名稱= RegionServer，子=復制，Hadoop：service = HBase，名稱= RegionServer，sub = WAL]