如何初始化JRockit MBean树

Question

下面的代码只列出在platform MBean服务器中找到的所有MBean名称：

  public static void main(final String[] args) throws Exception {

    initJMX();

  }

  @SuppressWarnings("unchecked")
  private static void initJMX() throws IOException, MalformedURLException, AttributeNotFoundException,
      InstanceNotFoundException, MalformedObjectNameException, MBeanException, ReflectionException,
      NullPointerException {
    JMXConnector jmxc = null;
    final Map<String, String> map = new HashMap<String, String>();
    jmxc = JMXConnectorFactory.newJMXConnector(createConnectionURL("localhost", 7788), map);
    jmxc.connect();
    final MBeanServerConnection connection = jmxc.getMBeanServerConnection();
    final String[] domains = connection.getDomains();
    for (final String domain : domains) {
      final Set<ObjectName> mBeans = connection.queryNames(new ObjectName(domain + ":*"), null);
      for (final ObjectName name : mBeans) {
        System.out.println(name);
      }
    }
    jmxc.close();
  }

当我尝试使用具有以下参数的JRockit 1.5.0_4.0.1运行此代码时：

-Xmanagement:ssl=false,authenticate=false,autodiscovery=false,port=7788

它打印出以下列表：

[INFO ][mgmnt  ] Remote JMX connector started at address localhost:7788 
[INFO ][mgmnt  ] Local JMX connector started
com.oracle.jrockit:type=FlightRecorder
java.util.logging:type=Logging
JMImplementation:type=MBeanServerDelegate
java.lang:type=Compilation
java.lang:type=GarbageCollector,name=Garbage collection optimized for throughput Young Collector
java.lang:type=MemoryManager,name=Class Manager
java.lang:type=MemoryPool,name=ClassBlock Memory
java.lang:type=GarbageCollector,name=Garbage collection optimized for throughput Old Collector
java.lang:type=Runtime
java.lang:type=MemoryPool,name=Nursery
java.lang:type=ClassLoading
java.lang:type=Threading
java.lang:type=MemoryPool,name=Class Memory
java.lang:type=OperatingSystem
java.lang:type=Memory
java.lang:type=MemoryPool,name=Old Space

但是，如果我在调用initJMX方法之前放置了一个断点，并且在这个点上用JRMC连接到那个JVM，那么JRMC会显示更多的MBeans，而且在继续执行程序之后，它还会打印一个包含更多与JRockit相关的MBeans的不同列表：

[INFO ][mgmnt  ] Remote JMX connector started at address T500W7AAD:7788 
[INFO ][mgmnt  ] Local JMX connector started
com.oracle.jrockit:type=FlightRecorder
oracle.jrockit.management:type=PerfCounters
oracle.jrockit.management:type=Compilation
oracle.jrockit.management:type=Log
oracle.jrockit.management:type=Profiler
oracle.jrockit.management:type=MemLeak
oracle.jrockit.management:type=JRockitConsole
oracle.jrockit.management:type=GarbageCollector
oracle.jrockit.management:type=Runtime
oracle.jrockit.management:type=Threading
oracle.jrockit.management:type=DiagnosticCommand
oracle.jrockit.management:type=Memory
java.util.logging:type=Logging
JMImplementation:type=MBeanServerDelegate
java.lang:type=Compilation
java.lang:type=GarbageCollector,name=Garbage collection optimized for throughput Young Collector
java.lang:type=MemoryManager,name=Class Manager
java.lang:type=MemoryPool,name=ClassBlock Memory
java.lang:type=GarbageCollector,name=Garbage collection optimized for throughput Old Collector
java.lang:type=Runtime
java.lang:type=MemoryPool,name=Nursery
java.lang:type=ClassLoading
java.lang:type=Threading
java.lang:type=MemoryPool,name=Class Memory
java.lang:type=OperatingSystem
java.lang:type=Memory
java.lang:type=MemoryPool,name=Old Space

有没有一种方法可以说JRockit可以在JVM启动时自动初始化这些bean，而不需要显式的JRMC连接？问题是，我试图编写一些重用其中一些MBeans的代码，但在与JRMC连接之前，它们是不可用的。

更新：这似乎是JRockit jdk1.5.0_4.0.1问题。同样的代码在JRockit jdk6.0_4.1.0上也能正常工作。

Answer 1

这似乎是我使用的Windows版本的JRockit的一个问题：

java version "1.5.0_24"
Java(TM) Platform, Standard Edition for Business (build 1.5.0_24-b02)
Oracle JRockit(R) (build R28.0.1-21-133393-1.5.0_24-20100512-2131-windows-x86_64, compiled mode)

相同的代码在WindowsJDK1.6.0的最新JRockit上的工作方式与预期相同：

java version "1.6.0_29"
Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
Oracle JRockit(R) (build R28.2.2-7-148152-1.6.0_29-20111221-2104-windows-x86_64, compiled mode)

在相同的JRockit版本上，但是对于Linux：

java version "1.5.0_24"
Java(TM) Platform, Standard Edition for Business (build 1.5.0_24-b02)
Oracle JRockit(R) (build R28.1.0-123-138454-1.5.0_24-20101014-1350-linux-x86_64, compiled mode)

Answer 2

尝试使用*:*的对象名称进行查询

final Set<ObjectName> mBeans = connection.queryNames(new ObjectName("*:*"),

可能JRMC在MBeanServer中找到的JRockit中有多个MBeanServers。