Ok, I see two issues here:

1) "already instrumened"

By any chance do you use the jacoco:instrument task in your build? jacoco:coverage does pure in-memory instrumentation and will not persist any instrumented classes on disk.

2) Exclude  3rd party Jars

Instead of excluding 3rd party Jars I would recomment to limit the scope to your code onlye with includes=com.mycompany.*

Regards,
-marc

On 22.01.15 10:48, [email protected] wrote:
I am using Jacoco with Ant for codecoverage. In my build script file, I am 
running 'Jacoco:coverage' with Junit on two projects.(I have 2 projects in my 
workspace with single build script.). 'Jacoco:coverage' task is running 
successfuly for 1st project but it is giving errors for second project. one of 
of those is as bellow-
Caused by: java.lang.IllegalStateException: Class 
org/junit/runner/notification/RunNotifier$SafeNotifier is already instrumented.

Build file tags (snap) are as bellows-
<jacoco:coverage destfile="${log.jacoco.dir}/${project.name}/jacoco.exec">
                        <junit printsummary="yes" errorProperty="test.failed" 
failureProperty="test.failed" haltonfailure="yes" fork="true">
..
...
..
</junit>
<jacoco:coverage>

also, classpath variable is being shared between two projects (above 
jacoco:coverage task is being called in loop).

So from my understanding, due to all classes from classpath variable are 
already been instrumented in first iteration, it is giving 'class is already 
instrumented' error in next iteration.

Is there any way where we can exclude third party jars from instrumentation. I tried 
with excludes option of <jacoco:coverage> tag where we can exclude classes, but 
in my case I have multiple jars in classpath so its not feasible to mentioned every 
class names (even regex with package)


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