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From: Knute Johnson <september@knutejohnson.com>
Newsgroups: comp.lang.java.help
Subject: Re: Using javac 7 to compile java 6 code
Date: Tue, 16 Aug 2011 13:20:56 -0700
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On 8/16/2011 12:52 PM, markspace wrote:
> On 8/16/2011 12:15 PM, Knute Johnson wrote:
>> I've got some currently running code that is using 1.6 runtimes and I
>> won't be able to upgrade them right away. I want to use the new compiler
>> for new work and I tried using the -target and -source options but I've
>> run into a snag. JList is now JList<E> and the compiler issues a warning
>> even with -source set to 1.6. Is that to be expected or what? I don't
>> think using the type specification with JList would compile with a 1.6
>> compiler. Do I just need to ignore the warning and press on? And
>> JComboBox too I found.
>
>
> I think you could probably just ignore the warning. I'd have to see the
> source code to be sure. Alternately, you can compile against an older
> version of the Java API if you have, for example, the 1.6 rt.jar still
> installed (or just available), I think.
>
> -bootclasspath bootclasspath
>
> Cross-compile against the specified set of boot classes. As with the
> user class path, boot class path entries are separated by colons (:) and
> can be directories, JAR archives, or ZIP archives.
>
> <http://download.oracle.com/javase/7/docs/technotes/tools/windows/javac.html>
>

Adding the bootclasspath gets rid of the warning with or without the 
-source and -target options.  I think I still need them though if I want 
it to run under a 1.6 VM.  At least the -target anyway.

Thanks,

-- 

Knute Johnson