Can't get auto instrumentation done with Play framework java

[ericjee]

Hi,
I had an Application wrote by JAVA and Playframework, Now I want to settle auto instrumentation to send trace to our trace backend via Opentelemetry.
I've added opentelemetry-javaagent-all.jar agent and some envs list below:

        - name: JVM_OPTS
          value: -J-Xms512m -J-Xmx2048m -J-javaagent:/server/opentelemetry-javaagent-all.jar
            -J-server
        - name: OTEL_TRACES_EXPORTER
          value: zipkin
        - name: OTEL_LOG_LEVEL
          value: debug
        - name: OTEL_METRICS_EXPORTER
          value: none
        - name: OTEL_EXPORTER_ZIPKIN_ENDPOINT
          value: http://simplest-collector.opentelemetry-operator-system:9411/api/v2/spans

logback.xml:

<root level="DEBUG">

After app startup, I didn't get a trace from opentelemetry, So I tried to debug with logging exporter

        - name: OTEL_TRACES_EXPORTER
          value: logging

After restart the app, I didn't see any logs related to opentelemetry, Please tell me if some settings are missing by myself, Or how to debug the agent status, It has taken me a few days, Any comments will be appreciated.

My app's Dockerfile:

FROM openjdk:8u181-jdk

# Copy Code
ADD target/universal/app-1.0.0.tgz /server/
ADD conf/opentelemetry-javaagent-all.jar /server/

EXPOSE 9000
CMD bash bin/app ${JAVA_OPTS} -Dlogger.file=/server/config/logback.xml -Dconfig.file=/server/config/application.conf -Dhttp.port=9000 -Denv=${env}

agent version: 1.1.0
Play version: 2.6.20

[mateuszrzeszutek]

Are there no javaagent logs at all? Not even the VersionLogger startup log?

Your dockerfile seems to use JAVA_OPTS env var while the yaml fragment that you posted defines JVM_OPTS - is this correct? Does JVM_OPTS get translated to JAVA_OPTS somewhere? Also, there are those -J prefixes in the JVM_OPTS env var, are these stripped by some script?

Also, I don't think that OTEL_LOG_LEVEL is used by anything, if you want to enable the javaagent debug mode try OTEL_JAVAAGENT_DEBUG = true.

[ericjee]

Thx for the reply!

Are there no javaagent logs at all? Not even the VersionLogger startup log?
Yes, None related logs are showing, Just looks like classes aren't load.

Your dockerfile seems to use JAVA_OPTS env var while the yaml fragment that you posted defines JVM_OPTS - is this correct? Does JVM_OPTS get translated to JAVA_OPTS somewhere? Also, there are those -J prefixes in the JVM_OPTS env var, are these stripped by some script?

Thx for point this out, I think this is the root cause, After pass option I got this error:
Unrecognized option: -J-javaagent:/server/opentelemetry-javaagent-all.jar

I will try to add this option to my dockerfile and rebuild the image to see if it's working, List below To answer your question about -J prefix.

###  ------------------------------- ###
###  Start of customized settings    ###
###  ------------------------------- ###
usage() {
 cat <<EOM
Usage: $script_name [options]

  # jvm options and output control
  JAVA_OPTS          environment variable, if unset uses "$java_opts"
  -Dkey=val          pass -Dkey=val directly to the java runtime
  -J-X               pass option -X directly to the java runtime
                     (-J is stripped)

[ericjee]

Now it works, Thank you Mateusz! @mateuszrzeszutek