Error Message "Classpath is incomplete. Only syntax errors will be reported" is always shown

Environment
  • Operating System: Windows 10
  • JDK version: Oracle 1.8.0 Update 111
  • Visual Studio Code version: 1.8.1
  • Java extension version: 0.0.8
Steps To Reproduce
  1. Open any .java file.
  2. Click on "Don't show again" when the error message is shown.
  3. Close the file and reopen. The message will be shown again.
Current Result

Click on "Don't show again" when the error message is shown. The message will be re-shown.

Expected Result

The message will not be shown in future when "Don't show again" is clicked.