Eclipse Luna 4.4.2中Papyrus无法显示已有图表的求助

Hey there, sorry to hear you're stuck with this frustrating problem where your Papyrus charts won’t load in Eclipse Luna SR2—even though they work perfectly on other devices, and you’ve tried reinstalling twice. Let’s walk through some targeted fixes that should get those charts showing up again:

1. Test with a Fresh Workspace #

Eclipse workspaces can accumulate corrupted cache or configuration data over time, and reinstalling Eclipse won’t fix this. Here’s what to do:

• Close Eclipse completely.
• Restart Eclipse and select Create a new workspace when prompted.
• Import your Papyrus project into this new workspace, then try opening the chart again.
  If the chart displays here, your original workspace was the culprit—you can either stick with the new workspace or migrate your settings over carefully.

2. Verify Papyrus Installation Completeness & Compatibility #

Even if you installed a "matching" Papyrus version, missing components or subtle version mismatches can break chart rendering:

• Go to Help > About Eclipse > Installation Details and check the list of installed software. Ensure all core Papyrus components (like Papyrus UML, Papyrus Diagram Editor) are present and marked as fully installed.
• If anything’s missing, head to Help > Install New Software, select the official Papyrus update site tailored for Luna SR2, and reinstall all required Papyrus packages. Uncheck "Group items by category" to see all available components clearly.

3. Clear Eclipse’s UI & Resource Caches #

Corrupted cache files often cause display glitches. Let’s clean these manually (back up your workspace first to avoid data loss):

• Close Eclipse.
• Navigate to your existing workspace folder, then go to .metadata/.plugins/.
• Delete the following folders:
  • org.eclipse.e4.workbench (handles UI state)
  • org.eclipse.core.resources/.projects/[your-papyrus-project-name] (project-specific resource cache)
• Restart Eclipse and try opening the chart again.

4. Validate the Chart File & Permissions #

Sometimes local file issues are the root cause, even if the file works elsewhere:

• Re-copy the working chart file from the device where it displays correctly to your local machine, replacing the existing file. This ensures no corruption happened during transfer.
• Check file permissions: On Windows, make sure the file isn’t set to "Read-only"; on Linux/macOS, confirm you have read/write access to the file and its parent folder.
• Try creating a brand new Papyrus chart in your Eclipse instance. If the new chart displays, the problem is isolated to your original file; if not, the issue lies with your Eclipse/Papyrus environment.

5. Check the Eclipse Error Log for Clues #

The error log will often reveal hidden exceptions causing the display failure:

• Open Eclipse and go to Window > Show View > Other > General > Error Log.
• Look for errors logged at the exact time you tried opening the chart—keep an eye out for entries like NullPointerException, ClassNotFoundException, or references to Papyrus diagram rendering classes.
• These error messages can pinpoint exactly what’s broken (e.g., a missing plugin, corrupted model data) and help narrow down the fix.

If none of these steps work, double-check that you’re using a compatible JDK version—Eclipse Luna SR2 requires JDK 7 or JDK 8 (64-bit is recommended). Using a newer JDK might introduce compatibility issues with the older Eclipse/Papyrus versions.

内容的提问来源于stack exchange，提问作者Sakia Azam