FULL PRODUCT VERSION :
java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) Server VM (build 24.75-b04, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Ubuntu 12.04 64 bit

A DESCRIPTION OF THE PROBLEM :
Good examples and explanation of problem is here
https://bugs.eclipse.org/bugs/show_bug.cgi?id=425140

Please fix Grammar ( .... HTML documents) or fix javac to raise an error

It would be good to be certain in this area as that affect other projects:
https://github.com/checkstyle/checkstyle/commit/a4e79cf45cf1c2cdf6d598e475f22e4967029d77
https://groups.google.com/d/msg/checkstyle-devel/7wlc3hadksM/LdSJvg-5fTcJ

I do not remember exact name of file but openjdk8 had or still have such file with double semicolon.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Try to compile following code:

import java.util.List;
; // Extra semicolon
import java.util.Set;

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Error, as in grammar where is no rule that describe that
ACTUAL -
no error

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import java.util.List;
; // Extra semicolon
import java.util.Set;
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
remove extra symbol ";"