当不是从 $JMETER_HOME/bin 运行时，Jmeter 无法使用 Prometheus JMX 代理启动

Question

Trying configure Prometheus JMX agent for Jmeter but faced following issue - when I start Jmeter outside of $JMETER_HOME/bin folder - it fails with an error:

java.lang.Throwable: Could not access null/lib
        at org.apache.jmeter.NewDriver.<clinit>(NewDriver.java:105)
java.lang.Throwable: Could not access null/lib/ext
        at org.apache.jmeter.NewDriver.<clinit>(NewDriver.java:105)
java.lang.Throwable: Could not access null/lib/junit
        at org.apache.jmeter.NewDriver.<clinit>(NewDriver.java:105)
java.lang.ClassNotFoundException: org.apache.jmeter.JMeter
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        at org.apache.jmeter.NewDriver.main(NewDriver.java:250)
JMeter home directory was detected as: null

Launch command:

java -Dcom.sun.management.jmxremote.port=12021 -Dcom.sun.management.jmxremote.rmi.port=12021 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dgroovy.use.classvalue=true -javaagent:/apps/injector/apache-jmeter/bin/jmx_prometheus_javaagent-0.13.0.jar=8778:/apps/injector/apache-jmeter/bin/prometheus_config.yaml -jar /apps/injector/apache-jmeter/bin/ApacheJMeter.jar -n -t /apps/injector/apache-jmeter/extras/Test.jmx

Same command works fine in case I run it from $JMETER_HOME/bin folder. It's not seems to be a Jmeter issue itself, as I can run same command from any place, and it will not cause an error in case I remove -javaagent option.

Can somebody help me configure Prometheus JMX agent for properly work with Jmeter.

Answer 1

Add to java options of JMeter:

-Djmeter.home=$JMETER_HOME

As per your bugzilla ticket:

• https://bz.apache.org/bugzilla/show_bug.cgi?id=64680

Credit to Felix S. member of JMeter team