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Try to compile the following source with -nowarn on the command line. class X { public static void main(String args[]) { char[] tab = null; System.out.println("" + c); } } You will end up with: ---------- 1. WARNING in D:\temp\X.java (at line 4) System.out.println("" + tab); ^^^ Must explicitly convert the char[] to a String -nowarn should remove ALL possible warnings. The Eclipse compiler fails two jacks tests because of this.
Fixed and released in 2.1 stream.
Change milestone.
Verified.