This is actually the the same junit.jar provided in %{_javadir} with the only difference being that the OSGi metadata is different. I think this could probably be removed. Initially this was to allow tycho to resolve against junit3, if necessary, but looking at the logs I see this isn't necessary any longer.

I think Eclipse requires it. I will convert it into a symlink.

As per upstream bug, expected bundles are:
org.junit_3.8.x
org.junit_4.8.x
org.junit4_4.8.x

we have:
-rw-r--r--. 1 root root 328768 org.junit_3.8.2.v3_8_2_v20100427-1100.jar (wrong, should be symlink)
lrwxrwxrwx. 1 root root       26 Apr 12 10:05 junit4.jar -> /usr/share/java/junit4.jar (ok, corresponding to org.junit_4.8.x)

drwxr-xr-x. 2 root root     4096 Apr 12 10:05 org.junit4 (it has a symlink to junit4.jar inside, looks like a duplication, to be removed).
drwxr-xr-x. 3 root root     4096 Apr 12 10:05 org.junit4_4.8.1.v20111115-0800  (ok)
lrwxrwxrwx. 1 root root       25 Apr 12 10:05 org.junit_4.8.2.v4_8_2_v20110321-1705.jar -> /usr/share/java/junit.jar (duplication)

eclipse-4.2.0-0.15.I201204171000.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/eclipse-4.2.0-0.15.I201204171000.fc17

Package eclipse-4.2.0-0.15.I201204171000.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing eclipse-4.2.0-0.15.I201204171000.fc17'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-6220/eclipse-4.2.0-0.15.I201204171000.fc17
then log in and leave karma (feedback).

eclipse-4.2.0-0.16.I201204171000.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/eclipse-4.2.0-0.16.I201204171000.fc17

Looking at the fix I see that there are 2 org.junit v4.8.2 jars. One is a symlink to %{_javadir}/junit.jar and the other at %{_libdir}/eclipse/dropins/jdt/plugins/org.junit_4.8.2.v4_8_2_v20110321-1705.jar . Both seem to be identical. Would it be possible to remove one of them ?

I ran a build of tycho against this new eclipse-jdt package and it fails because there are 2 junit jars with the same symbolicname, and version but with different locations on the system. Initially this passed because in previous versions, both were symlinks to the same file.

e-b removed the Junit source very early (and indeed, after a build, the builddirectory/plugins does not have org.junit_4*.jar, just junit symlink. I guess it is because of the PDEBuild, and the only solution for that is to delete the redundant plugin in Eclipse.spec.

eclipse-4.2.0-0.17.I201204171000.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/eclipse-4.2.0-0.17.I201204171000.fc17

eclipse-4.2.0-0.17.I201204171000.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.