Keep getting "Can't add different class with same name:" error. Please advise

[Yaroslav Chinskiy]

Hi,

I am switching my F/E application from emma to JaCoCo and need some guidance. With emma we produced instrumented build that would go to QA and later produce code coverage based on the manual/automated test.

I tried to run the same app with jacocoagent but now I can not generate a report.

i am using  report target that keeps failing with "Can't add different class with same name: com/comp/data/MyDataModel$1"

I tried to exclude it  <exclude name="**/*MyDataModel$1*"/> but no luck

For classfiles, I include all jar files from the class path.

What am I doing wrong?

[Marc R. Hoffmann]

Hi,

for coverage report generation all classes within a group must have
unique names. You get this error during report generation if JaCoCo is
supplied with multiple different class files with the same name. To fix
this remove those duplicate classes or create separate reports or report
groups for each version.

Best regards,
-marc

> --

[Yaroslav Chinskiy]

In this case, it fails with anonymous class which I have a lot (unfortunately)

I tried add these classes to exclude list but no luck...

Anything else i can try?

thank you.

[Marc Hoffmann]

JaCoCo works fine for anonymous classes. The problem is that the file

com/comp/data/MyDataModel$1.class

exists twice in your class path.

What you need to do is search your classpath, identify duplicates and
eliminate them.

Cheers,
-marc

> --

[abl...@gmail.com]

Do you have an example of how to accomplish this task in maven?

[Marc Hoffmann]

Hm, normaly in Maven all classes are picked from target/classes. I
wonder how it is possible to have a class with the same name twice in
this folder.

Where are your classes located you use for report generation?

Regards,
-marc

[bhupendr...@gmail.com]

>>I
wonder how it is possible to have a class with the same name twice in
this folder.

Hi Marc,

Below are the class names in the same folder (not sure how they are created like this)

OpBalConfig.28d44622411812a1.class
OpBalConfig.9a774f30a5a69cdb.class

Reports plugin considers these are duplicate and gives the error, is there a workaround for this issue, I am having lots of them in the classes folder and had to go and manually remove one of them to resolve this.

[Marc Hoffmann]

Hi,

looks like this classes are created with the classdumpdir option of the
JaCoCo agent, right?

If you see a class twize (with different ids in the file name) this
means that the JVM actually loads two different versions of the class.

I would recommend to use your original classes instead.

Regards,
-marc

[Bhupendra Mahajan]

>>looks like this classes are created with the classdumpdir option of the JaCoCo agent, right?

Yes

>>I would recommend to use your original classes instead.

How am I suppose to do that ?

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[Marc Hoffmann]

>>> I would recommend to use your original classes instead.
> How am I suppose to do that ?

1) Don't use the classdumpdir option
2) When generating the coverage report point to the compiled class files
(or JARs) which you want to test.

Regards,
-marc

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[Bhupendra Mahajan]

Hi Marc,

2) When generating the coverage report point to the compiled class files (or JARs) which you want to test

>>How to do this, don't see option on maven report plugin to point to JARS

Also can I use the same jacoco.exec (which was created with classdumpDIR option) for generating a report using above option

Thanks,

Bhupendra

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[Marc Hoffmann]

jacoco.exec file generation is not related to the classdumpdir option.

Rea^gards,
-marc

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[Bhupendra Mahajan]

Hi Mark,

How can I specify the jars to be used during report generation, can you help me with the syntax ?

I am using maven plugin

Thanks,

Bhupendra

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