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javajconsole

JConsole - Constant Disconnects with localhost/Kafka Sandbox

I am trying to use JConsole to monitor/view metrics for Kafka Sandbox with Docker containers. As soon as I connect to locahost:35000, I receive the error: "Secure Connection Failed: Retry Insecurely?"

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If I click Insecure connection, the connection works for a split second and then disconnects again with a different error: "Connection Lost: Reconnect?".

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I've researched and tried many different combinations of JMX arguments, including the arguments below and none have worked so far.

The actual exception returned in the debug log is:

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

Has anyone been able to fix this issue with JConsole?

Current arguments used:

jconsole -debug -J"-Dcom.sun.management.jmxremote=true, -Dcom.sun.management.jmxremote.authenticate=false, -Dcom.sun.management.jmxremote.ssl=false, -Djava.rmi.server.hostname=localhost,  -Dcom.sun.management.jmxremote.local.only=false, -Dcom.sun.management.jmxremote.rmi.port=35000, -Dcom.sun.management.jmxremote.port=35000, -Dcom.sun.management.jmxremote.port=35000"

Java Info:

java 14.0.1 2020-04-14
Java(TM) SE Runtime Environment (build 14.0.1+7)
Java HotSpot(TM) 64-Bit Server VM (build 14.0.1+7, mixed mode, sharing)

Docker Info:

CONTAINER ID   IMAGE                                      COMMAND                  CREATED      STATUS                  PORTS                                          NAMES
b21d9589e737   mongodb-kafka-base-setup-mongod:1.0        "bash -c 'sleep 10 &…"   4 days ago   Exited (0) 4 days ago                                                  mongo1-setup
c0a23e041e23   mongodb-kafka-base-mongod:1.0              "docker-entrypoint.s…"   4 days ago   Up 4 days               0.0.0.0:35001->27017/tcp                       mongo1
7c56b4ccc89a   confluentinc/cp-kafka-rest:7.2.2           "/etc/confluent/dock…"   4 days ago   Up 4 days               8082/tcp                                       rest-proxy
3b6fd1821270   confluentinc/cp-schema-registry:7.2.2      "/etc/confluent/dock…"   4 days ago   Exited (1) 4 days ago                                                  schema-registry
c303de030d9f   confluentinc/cp-kafka-connect-base:7.2.2   "/etc/confluent/dock…"   4 days ago   Up 4 days (healthy)     8083/tcp, 9092/tcp, 0.0.0.0:35000->35000/tcp   connect
4c1665f78d4c   confluentinc/cp-kafka:7.2.2                "/etc/confluent/dock…"   4 days ago   Up 4 days               9092/tcp                                       broker
b707c2d6b8be   confluentinc/cp-zookeeper:7.2.2            "/etc/confluent/dock…"   4 days ago   Up 4 days               2181/tcp, 2888/tcp, 3888/tcp                   zookeeper

Netstat Info:

  TCP    0.0.0.0:35000          0.0.0.0:0              LISTENING
  TCP    [::]:35000             [::]:0                 LISTENING
  TCP    [::1]:35000            [::]:0                 LISTENING
Solution

  • The fix for this issue was to update JDK to the latest version (in my case, JDK 19). After downloading/installing JDK 19 and running the updated JConsole, I no longer had the constant disconnects.

    https://www.oracle.com/java/technologies/downloads/#jdk19-windows