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Using Eclipse 3.3M6, I sometimes get this error: a Java user defined library becomes unknown to Eclipse. This phenomen shows up every now and then after closing a project, using another project and then reopening the first project. Suddenly Eclipse sees unknown types because it lost the userlibrary from where they are imported. I noticed that the library still is defined in ./metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.jdt.core.prefs. So i just moved the line with the missing userlibrary to another place in the file, restartet Eclipse and did a clean on the project - and voilà, the userlibrary is known again to Eclipse. Switching back to Eclipse 3.3M5, where i never had this error before, showed me someday, that it exists there also.
Would you have detailed steps to reproduce this problem ? There is not enough information in this bug report for us to understand the problem.
Well, I didn't find a way to reproduce this bug. It only shows occasionally. Sometimes it shows up when I restart Eclipse, sometimes it is when closing one project and open another. I do switch projects about 10 times a day and restart Eclipse maybe 2 or 3 times a day; the erronoues behaviour manifests itself 2 or 3 times a week.
*** Bug 185809 has been marked as a duplicate of this bug. ***
If unable to find steps to reproduce, could you please enable some tracing as follows to help us understand what's going on ? 1. Create a .options file with the following content: # Turn on debug tracing for org.eclipse.jdt.core plugin org.eclipse.jdt.core/debug=true # Reports classpath variable initialization, and classpath container resolution org.eclipse.jdt.core/debug/cpresolution=true 2. Start eclipse with the following command: eclipse.exe -debug <path to your .options file> -vm <path to java.exe> e.g. eclipse.exe -debug c:\temp\.options -vm c:\jdk1.5.0\bin\java.exe => this should open a DOS console 3. Ensure that the DOS console buffer size is as big as possible (Properties > Layout > Screen Buffer Size > set width and height to 9999) 4. When the problem occurs, copy/paste the content of the DOS console into a file, and attach the file to this bug
I wonder if this is a duplicate of bug 154984 ?
Doesn't seem to be the case since it happens with M6 and 154984 has been fixed for M6.
I've also encountered this problem on eclipse 3.3. I had added new user library with some jars and after few restarts user library has just disappeared. I have other user libraries defined and they behave ok. Only this one user library always disappear. My friend also complain about disappearing user libraries.
(In reply to comment #7) > I've also encountered this problem on eclipse 3.3. I had added new user library > with some jars and after few restarts user library has just disappeared. I have > other user libraries defined and they behave ok. Only this one user library > always disappear. > My friend also complain about disappearing user libraries. > Please see comment 4
Additional info. When I am running eclipse on java 1.5.0_12 few of my user libraries are unavailable (invisible), but when Im running eclipse on java 1.6.0_02 libraries are visible.
Created attachment 76284 [details] Log from eclipse when running on java 1.5 Log from eclipse when running on java 1.5
Created attachment 76285 [details] Log from eclipse when running on java 1.6 Log from eclipse when running on java 1.6
Comment to Logs: I have defined 9 user libraries. On java 5 I can see only 4 user libraries: - Axis1.4 - TMobileRAN - spring - hibernate_anotations On java 6 I can see all 9 user libraries.
Thanks for the feedback Piotr. The trace from comment 10 shows that some user libraries are not initialized when they should. To further investigate, I improved the tracing again. Could you please replace your existing org.eclipse.jdt.core.*.jar (in the plugins directory) with the one posted at http://www.eclipse.org/jdt/core/r3.3/index.php#UPDATES ? Then please attach the new trace you get to this bug report. Thanks.
Created attachment 76306 [details] Extended Eclipse log when running on java 1.5 I attached log from new jdt (extended logs). This time 3 user libraries are not visible: - hibernate_core - hibernateCore - TestHibernateCore These libraries contains exactly the same jars.
Thanks again. Now can you please attach ./metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.jdt.core.prefs to this bug ?
Created attachment 76312 [details] jdt preferences Here it is.
I have rewritten the user library manager to make it simpler and thus avoiding a potential concurrency problem. Could you please try the patch at http://www.eclipse.org/jdt/core/patches/org.eclipse.jdt.core_3.3.1.z20070821-1711.jar and let me know if this fixes the problem ? Thanks.
Created attachment 76767 [details] Corresponding code patch Waiting on feedback from user before committing the patch.
Created attachment 76771 [details] Slightly improved patch
For me patch resolve the problem. I haven't used 'slightly improved patch'.
Thanks for the feedback. Patch released for 3.3.1 in R3_3_maintenance. The corresponding update can be found at http://www.eclipse.org/jdt/core/r3.3/index.php#UPDATES. The temporary patch from comment 17 has been removed.
Patch released for 3.4M2 in HEAD.
Verified by user.
*** Bug 202241 has been marked as a duplicate of this bug. ***
*** Bug 159452 has been marked as a duplicate of this bug. ***
*** Bug 211897 has been marked as a duplicate of this bug. ***
