Exception with openjdk

[devnewton]

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/management/OperatingSystemMXBean
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
	at java.base/java.lang.Class.privateGetDeclaredMethods(Unknown Source)
	at java.base/java.lang.Class.getDeclaredMethod(Unknown Source)
	at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(Unknown Source)
	at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(Unknown Source)

[theobisproject]

Is it possible to get more information about the JDK you observed this exception on? The following would help greatly:

• Distribution (Oracle, Temurin, Amazon Corretto)
• Version (11, 17, 21, ...)
• Used OS

Please not that the not found class is platform specific and might not be available in the OS JDK combination.

[devnewton]

I use a Docker image with openjdk and maven ( maven:3.9.9-eclipse-temurin-17 https://github.com/carlossg/docker-maven/blob/8cfe24baffa5b250f7bb2d31ce233fc28f3c4f20/eclipse-temurin-17/Dockerfile ) on Ubuntu.

The full java distribution information : OpenJDK 64-Bit Server VM Temurin-17.0.13+11 (17.0.13+11, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64).

[adelnoureddine]

Hi, it may be possible that OperatingSystemMXBean class isn't available in your Java distribution in Docker.

[theobisproject]

I failed to reproduce your issue with the JDK base image used in the Dockerfile you linked.

Running the JDK on a bare metal Ubuntu 24.04 worked as expected

$ sudo /opt/jdk-17.0.13+11/bin/java -javaagent:target/joularjx-3.0.0.jar -version
17/11/2024 09:18:51.546 - [INFO] - +---------------------------------+
17/11/2024 09:18:51.546 - [INFO] - | JoularJX Agent Version 3.0.0    |
17/11/2024 09:18:51.546 - [INFO] - +---------------------------------+
17/11/2024 09:18:51.560 - [INFO] - Results will be stored in joularjx-result/56857-1731831531558/
17/11/2024 09:18:51.567 - [INFO] - Initializing for platform: 'linux' running on architecture: 'amd64'
17/11/2024 09:18:51.574 - [INFO] - Please wait while initializing JoularJX...
17/11/2024 09:18:52.581 - [INFO] - Initialization finished
17/11/2024 09:18:52.581 - [INFO] - Started monitoring application with ID 56857
openjdk version "17.0.13" 2024-10-15
OpenJDK Runtime Environment Temurin-17.0.13+11 (build 17.0.13+11)
OpenJDK 64-Bit Server VM Temurin-17.0.13+11 (build 17.0.13+11, mixed mode, sharing)
17/11/2024 09:18:53.632 - [INFO] - JoularJX finished monitoring application with ID 56857
17/11/2024 09:18:53.632 - [INFO] - Program consumed 5.54 joules
17/11/2024 09:18:53.635 - [INFO] - Energy consumption of methods and filtered methods written to files

This means the JDK should not throw the NoClassDefFoundError.

Running in a Docker container exits early for me since the RAPL interface is not available in the container

17/11/2024 08:30:37.340 - [INFO] - Could not locate config.properties, will use default values
17/11/2024 08:30:37.341 - [INFO] - +---------------------------------+
17/11/2024 08:30:37.341 - [INFO] - | JoularJX Agent Version 3.0.0    |
17/11/2024 08:30:37.341 - [INFO] - +---------------------------------+
17/11/2024 08:30:37.353 - [INFO] - Results will be stored in joularjx-result/1-1731832237351/
17/11/2024 08:30:37.361 - [INFO] - Initializing for platform: 'linux' running on architecture: 'amd64'
17/11/2024 08:30:37.361 - [SEVERE] - Platform not supported. Exiting...

The Dockerfile I used

FROM eclipse-temurin:17-jdk

RUN apt-get update \
  && apt-get install -y ca-certificates curl git openssh-client --no-install-recommends \
  && rm -rf /var/lib/apt/lists/*

COPY target/joularjx-3.0.0.jar /root/

CMD ["java", "-javaagent:/root/joularjx-3.0.0.jar", "-version"]

Have you done any specific mounts for your Docker container to be able to use the RAPL interface? Anything changed in the properties file to get the agent to try and initialize the OperatingSystemMXBean?