java.lang.SecurityException: Expecting a sun.rmi.server.UnicastRef2 remote reference in stub

Question

I am trying to connect to a remote Java process which is running on a different machine using JConsole tool on my Ubuntu machine.

This is how I am running the Java program in remote machine:

sudo java -Dcom.sun.management.jmxremote.port=51082 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -jar myfile.jar

I am running JConsole command on my machine like this:

jconsole -debug -J-Djava.util.logging.config.file=Logging.properties

This is my Logging.properties file:

handlers = java.util.logging.ConsoleHandler

sun.rmi.level=FINEST
.level = INFO

java.util.logging.ConsoleHandler.level = FINEST

java.util.logging.ConsoleHandler.formatter = \

java.util.logging.SimpleFormatter

// Use FINER or FINEST for javax.management.remote.level - FINEST is

// very verbose...

javax.management.level = FINEST

javax.management.remote.level = FINER

Now on my Jconsle UI I have given below properties:

When I click on Connect button I am getting exception saying:

    FINER: [javax.management.remote.rmi.RMIConnector: jmxServiceURL=service:jmx:rmi:///jndi/rmi://my-remote-host:51082/jmxrmi] failed to connect: java.lang.SecurityException: Expecting a sun.rmi.server.UnicastRef2 remote reference in stub!
    java.lang.SecurityException: Expecting a sun.rmi.server.UnicastRef2 remote reference in stub!

This is the complete stacktrace of the exception as per logs:

Jul 14, 2015 7:39:55 PM RMIConnector connect
FINER: [javax.management.remote.rmi.RMIConnector: jmxServiceURL=service:jmx:rmi:///jndi/rmi://my-remote-host:51082/jmxrmi] connecting...
Jul 14, 2015 7:39:55 PM RMIConnector connect
FINER: [javax.management.remote.rmi.RMIConnector: jmxServiceURL=service:jmx:rmi:///jndi/rmi://my-remote-host:51082/jmxrmi] finding stub...
Jul 14, 2015 7:39:55 PM sun.rmi.transport.tcp.TCPEndpoint <clinit>
FINE: VMPanel.connect: localHostKnown = true, localHost = 127.0.0.8
Jul 14, 2015 7:39:55 PM sun.rmi.server.UnicastRef newCall
FINE: VMPanel.connect: get connection
Jul 14, 2015 7:39:55 PM sun.rmi.transport.tcp.TCPTransport <init>
FINE: VMPanel.connect: Version = 2, ep = [127.0.0.8:0]
Jul 14, 2015 7:39:55 PM sun.rmi.transport.tcp.TCPEndpoint getLocalEndpoint
FINE: VMPanel.connect: created local endpoint for socket factory null on port 0
Jul 14, 2015 7:39:55 PM sun.rmi.transport.tcp.TCPChannel createConnection
FINE: VMPanel.connect: create connection
Jul 14, 2015 7:39:55 PM sun.rmi.transport.tcp.TCPEndpoint newSocket
FINER: VMPanel.connect: opening socket to [my-remote-host:51082]
Jul 14, 2015 7:39:55 PM sun.rmi.transport.proxy.RMIMasterSocketFactory createSocket
FINE: VMPanel.connect: host: my-remote-host, port: 51082
Jul 14, 2015 7:39:58 PM sun.rmi.transport.tcp.TCPChannel createConnection
FINER: VMPanel.connect: server suggested 10.56.36.2:36585
Jul 14, 2015 7:39:58 PM sun.rmi.transport.tcp.TCPChannel createConnection
FINER: VMPanel.connect: using 127.0.0.8:0
Jul 14, 2015 7:39:58 PM sun.rmi.server.UnicastRef newCall
FINER: VMPanel.connect: create call context
Jul 14, 2015 7:39:58 PM sun.rmi.server.UnicastRef logClientCall
FINER: VMPanel.connect: outbound call: [endpoint:[my-remote-host:51082](remote),objID:[0:0:0, 0]] : sun.rmi.registry.RegistryImpl_Stub[0:0:0, 0]: java.rmi.Remote lookup(java.lang.String)
Jul 14, 2015 7:39:58 PM sun.rmi.transport.StreamRemoteCall <init>
FINER: VMPanel.connect: write remote call header...
Jul 14, 2015 7:39:58 PM sun.rmi.transport.StreamRemoteCall getOutputStream
FINER: VMPanel.connect: getting output stream
Jul 14, 2015 7:39:58 PM sun.rmi.server.UnicastRef invoke
FINER: VMPanel.connect: execute call
Jul 14, 2015 7:39:59 PM sun.rmi.transport.StreamRemoteCall getInputStream
FINER: VMPanel.connect: getting input stream
Jul 14, 2015 7:39:59 PM sun.rmi.server.LoaderHandler loadClass
FINE: VMPanel.connect: name = "javax.management.remote.rmi.RMIServerImpl_Stub", codebase = "", defaultLoader = sun.misc.Launcher$AppClassLoader@530f243b
Jul 14, 2015 7:39:59 PM sun.rmi.server.LoaderHandler loadClass
FINER: VMPanel.connect: class "javax.management.remote.rmi.RMIServerImpl_Stub" found via defaultLoader, defined by null
Jul 14, 2015 7:39:59 PM sun.rmi.server.LoaderHandler loadClass
FINE: VMPanel.connect: name = "java.rmi.server.RemoteStub", codebase = "", defaultLoader = sun.misc.Launcher$AppClassLoader@530f243b
Jul 14, 2015 7:39:59 PM sun.rmi.server.LoaderHandler loadClass
FINER: VMPanel.connect: class "java.rmi.server.RemoteStub" found via defaultLoader, defined by null
Jul 14, 2015 7:39:59 PM sun.rmi.server.LoaderHandler loadClass
FINE: VMPanel.connect: name = "java.rmi.server.RemoteObject", codebase = "", defaultLoader = sun.misc.Launcher$AppClassLoader@530f243b
Jul 14, 2015 7:39:59 PM sun.rmi.server.LoaderHandler loadClass
FINER: VMPanel.connect: class "java.rmi.server.RemoteObject" found via defaultLoader, defined by null
Jul 14, 2015 7:39:59 PM sun.rmi.server.UnicastRef done
FINE: VMPanel.connect: free connection (reuse = true)
Jul 14, 2015 7:39:59 PM sun.rmi.transport.tcp.TCPChannel free
FINE: VMPanel.connect: reuse connection
Jul 14, 2015 7:39:59 PM sun.rmi.transport.tcp.TCPChannel free
FINE: VMPanel.connect: create reaper
Jul 14, 2015 7:39:59 PM sun.rmi.server.UnicastRef newCall
FINE: VMPanel.connect: get connection
Jul 14, 2015 7:39:59 PM sun.rmi.transport.tcp.TCPChannel createConnection
FINE: VMPanel.connect: create connection
Jul 14, 2015 7:39:59 PM sun.rmi.transport.tcp.TCPEndpoint newSocket
FINER: VMPanel.connect: opening socket to [127.0.1.1:57675]
Jul 14, 2015 7:39:59 PM sun.rmi.transport.proxy.RMIMasterSocketFactory createSocket
FINE: VMPanel.connect: host: 127.0.1.1, port: 57675
Jul 14, 2015 7:39:59 PM sun.rmi.server.UnicastRef newCall
FINE: RMI RenewClean-[127.0.1.1:57675]: get connection
Jul 14, 2015 7:39:59 PM sun.rmi.transport.tcp.TCPChannel createConnection
FINE: RMI RenewClean-[127.0.1.1:57675]: create connection
Jul 14, 2015 7:39:59 PM sun.rmi.transport.tcp.TCPEndpoint newSocket
FINER: RMI RenewClean-[127.0.1.1:57675]: opening socket to [127.0.1.1:57675]
Jul 14, 2015 7:39:59 PM sun.rmi.transport.WeakRef pin
FINER: VMPanel.connect: strongRef = sun.rmi.transport.DGCImpl@63a1b509
Jul 14, 2015 7:40:00 PM sun.rmi.transport.proxy.RMIMasterSocketFactory createSocket
FINE: RMI RenewClean-[127.0.1.1:57675]: host: 127.0.1.1, port: 57675
Jul 14, 2015 7:40:00 PM sun.rmi.transport.ObjectTable putTarget
FINER: VMPanel.connect: add object [0:0:0, 2]
Jul 14, 2015 7:40:00 PM sun.rmi.transport.ConnectionInputStream done
FINER: VMPanel.connect: send ack
Jul 14, 2015 7:40:00 PM sun.rmi.transport.tcp.TCPChannel newConnection
FINE: VMPanel.connect: reuse connection
Jul 14, 2015 7:40:00 PM sun.rmi.transport.tcp.TCPChannel free
FINE: VMPanel.connect: reuse connection
Jul 14, 2015 7:40:00 PM RMIConnector connect
FINER: [javax.management.remote.rmi.RMIConnector: jmxServiceURL=service:jmx:rmi:///jndi/rmi://my-remote-host:51082/jmxrmi] failed to connect: java.lang.SecurityException: Expecting a sun.rmi.server.UnicastRef2 remote reference in stub!
java.lang.SecurityException: Expecting a sun.rmi.server.UnicastRef2 remote reference in stub!
    at javax.management.remote.rmi.RMIConnector.checkStub(RMIConnector.java:1871)
    at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:295)
    at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:268)
    at sun.tools.jconsole.ProxyClient.tryConnect(ProxyClient.java:357)
    at sun.tools.jconsole.ProxyClient.connect(ProxyClient.java:313)
    at sun.tools.jconsole.VMPanel$2.run(VMPanel.java:292)
Jul 14, 2015 7:40:01 PM sun.rmi.server.UnicastRef newCall
FINE: RMI RenewClean-[127.0.1.1:57675]: get connection
Jul 14, 2015 7:40:01 PM sun.rmi.transport.tcp.TCPChannel createConnection

I am not able to figure out where is the issue.

update:

I am able to connect to my remote host for the given port:

telnet my_remote_host 51082

As per this link, I got the response from the host without any issues.

Answer 1

Please use below settings . I was also facing same issue but resolved after having below settings

-Dcom.sun.management.jmxremote 
-Dcom.sun.management.jmxremote.authenticate=false 
-Dcom.sun.management.jmxremote.ssl=false 
-Dcom.sun.management.jmxremote.port=9704 
-Djava.rmi.server.hostname=172.18.137.35 
-Dcom.sun.management.jmxremote.rmi.port=970

Please note of Djava.rmi.server.hostname and Dcom.sun.management.jmxremote.rmi.port.

Even after this settings it will ask for insecure connection please accept it and then you are able to connect (it will give you error and of failed to connect: java.lang.SecurityException: Expecting a sun.rmi.server.UnicastRef2 remote reference in stub!).