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Created attachment 284184 [details] .log file This is a new installation of the IDE for C/C++ 2020-09, with the Scala IDE added from the Marketplace, and the Java Development Tools. I originally saw this when I seem to have accidentally upgraded the CDT in a 2020-06 installation (also with the Scala IDE). That led me to do the fresh 2020-09 install. Eclipse is apparently using an internal Java 14, but I also see this when I point it to an external Java 11. Obviously this release needs Java 11+. The key message seems to be: org.aspectj.weaver.BCException: Unable to find Asm for stackmap generation (Looking for 'aj.org.objectweb.asm.ClassReader'). Stackmap generation for woven code is required to avoid verify errors on a Java 1.7 or higher runtime when weaving type org.eclipse.debug.core.sourcelookup.AbstractSourceLookupDirector when weaving classes when weaving
The bug renders Eclipse unusable, causing directory names to be blank in the Project Explorer, and producing this error window with most operations.
Workaround is to install the 2020-06 release and avoid upgrades.
Sorry for the slow triage, I think this needs to be looked at by the AspectJ project.
From what I can see here is that the Scala IDE uses a quite old version of the weaving hook implementation from AspectJ, wich is probably not compatible with the latest JDK versions. I need to take a deeper look into this, but most likely the Scala IDE need to update their included Equinox AspectJ Weaving hook feature.
It looks indeed like the old weaving implementation that is used by the Scala IDE is not compatible with recent JDK versions and needs an update. I verified this by installing the Equinox Weaving parts from this update site: https://download.eclipse.org/tools/ajdt/410/dev/update/ into a plain C++ 2020-09 package and that seems to be working just fine. So please report this issue to the Scala IDE, so that they can update the version of the Weaving SDK that they include. Unfortunately, I have no idea for a workaround. Installing the working version of the Weaving SDK before installing the Scala IDE doesn't work, since the Scala IDE downgrades the weaving SDK pieces again to the older version that doesn't work. So closing this one here as NOT_ECLIPSE, since Scala IDE needs to publish a newer version that includes an updated version of the Weaving SDK.
It appears that Scala IDE is no longer being developed since the ENSIME project shut down, with some drama. Metals and VSCode is the new thing. I guess I learned this after opening this bug.
