[ cobertura-Feature Requests-2030120 ] Support for Eclipse PDE

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Feature Requests item #2030120, was opened at 2008-07-28 11:01
Message generated for change (Comment added) made by nchaitas
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: nchaitas (nchaitas)
Assigned to: Nobody/Anonymous (nobody)
Summary: Support for Eclipse PDE 

Initial Comment:
Hi!
We develop an Eclipse based project with OSGi bundles etc and we tried to introduce Cobertura to it with no success. While there were no problems by simple Junit tests, there were class loading problems by tests that need to get run as JUnit plugin tests. I searched around and I found out that other developers had the same problems too (http://dev.eclipse.org/newslists/news.eclipse.tptp/msg02546.html). Therefore they had to go for EMMA, which seems to deal with these problems thanks to its "in place" (overwrite mode) instrumentation in offline mode and its installation as an extension to JRE (http://dev.eclipse.org/newslists/news.eclipse.platform/msg44478.html) . 
Does Cobertura provide any similar solution for it and if not, is there any intention to face this problem?

Thank you in advance,
neo

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>Comment By: nchaitas (nchaitas)
Date: 2008-07-29 13:55

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Hi John,

thanks for your response.
Unfortunately I am not familiar with the way the code coverage tools
instrument the classes, but it seems that you do, so I appreciate a
lot your assistance!

The EMMA link you mentioned is:
http://emma.sourceforge.net/userguide/ar01s02s03.html (for command line)
and
http://emma.sourceforge.net/userguide/ar01s03s03.html (for ANT)

The in-place instrumentation is not the reason it doesn't work, since
I manually replace the original classes with the instrumented ones.

In Eclipse there are 4 ways to define the classloader type (s.
http://dev.eclipse.org/mhonarc/lists/equinox-dev/msg04389.html).
EMMA works for eclipse, when it gets installed on the ext/ directory
of the JRE and the Eclipse classloader type is set to "ext" (however
EMMA's got just one jar, while cobertura.jar depends on 4 other jars).
I tried putting cobertura.jar on the JRE/ext directory and setting the
Eclipse classloader type to "ext" and it didn't work.
My classes could still not find
cobertura.jar\net\sourceforge\cobertura\coveragedata\HasBeenInstrumented.class.

I also tried for instance to create an Eclipse cobertura plugin (a wrapper

of cobertura.jar and its 4 required jars under lib/), add it as a
dependency 
to my plugins and then integrate it to my build process (without any
references 
to it of course). While in the Eclipse IDE my plugins set to depend on my
new 
cobertura plugin could reference class coveragedata\HasBeenInstrumented
the 
generated byte code instrumented into my plugins in the scope of the
testing 
process still did not work.

I read somewhere that EMMA and cobertura generate pretty different
instrumented byte codes, so I just guessed, that the way the generated 
byte code references the cobertura classes was the problem.
For this reason and because it seems I was not the only one who tried
to integrate cobertura to Eclipse PDE (Plugin Development Environment)
I posted this issue under feature requests and not as a bug.

I hope that that could clear up things a little bit.
Kind regards,
neo

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Comment By: John Lewis (lewijw)
Date: 2008-07-28 14:22

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Can you give me the link for EMMA's instructions for offline mode
operation?

It is possible to have Cobertura instrument in place.   Just don't use the
todir attribute of <cobertura-instrument>.

I'm not a plugin developer, but I imagine you need to make sure Cobertura
is loaded by the root classloader.  I'm not sure how to do that with
Eclipse.

I would like to get this working.

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