How to feed EclEmma (w Jacoco) with externally collected data

[Aslak Knutsen]

Heya

In Arquillian we collect coverage data from remote jvm's using Jacoco. When used in combination with the Maven Jacoco plugin we simply append the remote data to the target/jacoco.exec file and the Report plugin is happy to report on it. 

How can we get the same integration with the Eclipse IDE plugin?

Is there a alternative file location to use?

[Aslak Knutsen]

... one hacky options ...

Lookup the UUID ExecutionDataAccess field added by the MemoryExecutionDataSource from the javaagent and append the remote data:

Field f = UUID.class.getDeclaredField("$jacocoAccess");

Object executor = f.get(null);

Method m = executor.getClass().getDeclaredMethod("getExecutionData", new Class[]{Object[].class});

for(ExecutionData data : dataStore.getContents()) {

   m.setAccessible(true);

   Object[] probeData = new Object[] {data.getId(), data.getName(), data.getData().length};

   m.invoke(executor, new Object[] {probeData});

   boolean[] resultData = (boolean[])probeData[0];

   for(int i = 0; i < data.getData().length; i++) {

  if(!resultData[i]) {

  resultData[i] = data.getData()[i];

  }

   }

}

Any cleaner way? :)

-aslak-

[Aslak Knutsen]

oops.. I mean ModifiedSystemClassRuntime, not MemoryExecutionDataSource.

[Marc R. Hoffmann]

Hi,

by design the JaCoCo agent should not be visible to the application
under test. That's why there are only hacky options. Another one would
be to look for a private static field $jacocoData in the application
classes (added by instrumentation).

Best regards,
-marc

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[Marc R. Hoffmann]

Hi,

via "File -> Import" you can import external *.exec files which results
in a separate sessions. Multiple sessions can merged into a single one
in the coverage view.

All this is based on public APIs of the eclemma.core plug-in.

Best regards,
-marc

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>
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[Aslak Knutsen]

yea, but for that I need access to the Eclipse JVM. I'm only running in the JUnit JVM.

I'm using the UUID ExecutionDataAccess hack at the moment. While it's a hack it seems to work quite nicely with both Maven and Eclipse. 

-aslak-

[Marc R. Hoffmann]

Ok, I see. So JVM A (under control of EclEmma) spawns JVM B (also under
code coverage) and collects execution data from B. Correct?

I don't think this is currently possible.

BTW, EclEmma does not work with *.exec files. It uses opens a socket
server for every launch and configured the agent in tcpclient mode.

Best regards,
-marc