Query regarding Offline instrumentation while running application through jar

[aksa...@gmail.com]

Hello Jacoco Team,

I was trying out several configurations for code coverage using Jacoco. I ran into one query. Please help to resolve it.

I have a Java Application which is executed using "java -jar service-app.jar" command. I tried to use offline instrumentation on this. I took the class file and used below command to do offline instrumentation
"java -jar jacococli.jar instrument service/target/classes --dest /instrumented"

Then I am starting the application using below command :
java -Djacoco-agent.output=tcpserver -Djacoco-agent.address=localhost -Djacoco-agent.port=6300 -Djacoco-agent.append=false -Djacoco-agent.jmx=true -cp .:instrumented:jacocoagent.jar -jar service-app.jar

but when I am trying to dump the coverage it show error :

[INFO] Connecting to localhost/127.0.0.1:6300.

This does not happen with java application that I start using Class Name(java Hellomain) instead of "java -jar" command.

Can you help regarding this.
Is there any configuration I am missing ?

Thanks
Amit

[Marc Hoffmann]

From JDK documentation (https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html): 

"When you use the -jar option, the specified JAR file is the source of all user classes, and other class path settings are ignored."

So if you really want to use offline instrumentation (why?) you need to instrument the jar file.

As always we recommend using the JaCoCo agent as a Java agent without the hassles of offline instrumentation.

Regards,

-marc

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