http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2678

diff -Naur jflex-1.6.1.orig/src/main/java/jflex/Emitter.java jflex-1.6.1/src/main/java/jflex/Emitter.java
--- jflex-1.6.1.orig/src/main/java/jflex/Emitter.java	2015-03-16 17:27:31.000000000 +0000
+++ jflex-1.6.1/src/main/java/jflex/Emitter.java	2015-10-25 23:33:35.784487747 +0000
@@ -1304,8 +1304,10 @@
     
     for (int i = 0; i < dfa.numStates;  i++) {
       char j = 0;
-      while ( !isTransition[i] && j < dfa.numInput )
-        isTransition[i] = dfa.table[i][j++] != DFA.NO_TARGET;
+      while ( !isTransition[i] && j < dfa.numInput ) {
+        isTransition[i] = dfa.table[i][j] != DFA.NO_TARGET;
+        j++;
+      }
     }
   }