问题
I am getting this error in my adt eclipse. I am using the updated version of java. Please somebody help me to solve this issue.
回答1:
I found the same bug in Eclipse once.
This happened to me after a Windows Update.
What I did to resolve the problem was giving (again) "Full Control"/"Admin Write Read" permissions to Eclipse Folder, in my case was in "C:\eclipse-jee-kepler-SR2-win32-x86_64". (Right Click on it, then Properties -> Security Tab and Edit there at -least your user- with Full Control)
For some reason the Windows Update changed that.
回答2:
I got this error in eclipse photon. I started photon with older workspace. I removed .metadata and .recommenders folders and then restarted the eclipse. It worked fine.
回答3:
In my case, I had to switch ownership back to my ID in my workspace/.metadata folder, then all was well. I had inherited an old user ID for my login after a system update. [Ubuntu 14 --> 16]
来源：https://stackoverflow.com/questions/23211494/plug-in-org-eclipse-jdt-ui-was-unable-to-load-class-org-eclipse-jdt-internal-ui