When connecting jconsole from a jdk image built with the jdk/ workspace, we see
this stack trace:

Exception in thread "VMPanel.connect" java.lang.NoClassDefFoundError: javax/rmi/GetORBPropertiesFileAction
    at javax.rmi.PortableRemoteObject.getORBPropertiesFile(PortableRemoteObject.java:217)
    at javax.rmi.PortableRemoteObject.createDelegateIfSpecified(PortableRemoteObject.java:172)
    at javax.rmi.PortableRemoteObject.<clinit>(PortableRemoteObject.java:61)
    at javax.management.remote.rmi.RMIConnector.findRMIServerJRMP(RMIConnector.java:1960)
    at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1873)
    at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:276)
    at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:267)
    at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:226)
    at sun.tools.jconsole.ProxyClient.tryConnect(ProxyClient.java:366)
    at sun.tools.jconsole.ProxyClient.connect(ProxyClient.java:316)
    at sun.tools.jconsole.VMPanel$2.run(VMPanel.java:298)

neither the generated rt.jar nor the build/.../classes dir have the javax/rmi/GetORBPropertiesFileAction class.

As it appears, the jdk/make/common/internal/Defs-corba.gmk files only lists
     javax/rmi/PortableRemoteObject.class
while the javax/rmi/PortableRemoteObject.java file actually generates 3 classes:
     javax/rmi/PortableRemoteObject.class
     javax/rmi/GetORBPropertiesFileAction$1.class
     javax/rmi/GetORBPropertiesFileAction.class

Note: In openjdk 7, the Defs-corba.gmk file lists the whole javax/rmi package instead
      of listing individual class files. Should openjdk 6 do the same?