Preferring class files to source files in

Jeremy Manson jeremymanson at
Wed Nov 13 15:12:10 PST 2013

This was easier than finding all of the places we zap the timestamps and
putting in special logic to handle source files separately (note that our
users can add zapping logic to their own invocation of jar if they want
better caching behavior).

We can certainly keep this local if you guys don't want it - I knew it was
borderline when I sent it.  I'll ping this thread again when 9 opens up.


On Wed, Nov 13, 2013 at 3:00 PM, Jonathan Gibbons <
jonathan.gibbons at> wrote:

> On 11/13/2013 02:38 PM, Jeremy Manson wrote:
>> Hi folks,
>> A bit of background:
>> - We use a content-addressable storage around here, so to minimize the
>> diffs between two JAR files (and get more hits in our content-addressable
>> storage), we reset all timestamps in JAR files to the same values.
>> - Some of our users include both source and class files in their JAR
>> files.
>> - When those users want to put those JAR files on the classpath for
>> javac, and use them to compile other files, they may not have included
>> enough on the classpath to compile the source files.
>> - We've worked around this by favoring classfiles when the two files are
>> of the same age.  This has the added benefit of not having to recompile the
>> source files when they are found.
>> - What do you think?  Too esoteric?  Wait for JDK9?
> Since you've gotten in the business of zapping timestamps in jar files
> anyway, why not zap them more intelligently so that class files have newer
> time stamps than corresponding source files?
> -- Jon
-------------- next part --------------
An HTML attachment was scrubbed...

More information about the compiler-dev mailing list