how to force recompile everything using javac task

[G***@sybase.com]

Hi,

how to force recompile everything using javac task?
Javac task always compare modify time with target classes. I want to
recompile java source no matter target classes exists and newer.

Is there any options to achieve this?

Thanks,

[Raymond Berg (ALLETE)]

I'd have to go with the previous recommendations on this topic and say
that wiping *.class files would be the easiest solution here.

http://mail-archives.apache.org/mod_mbox/ant-user/200509.mbox/%3C4320007
***@steria.com%3E

However, if there are other restrictions such as class files in the same
directory that can't be stripped because it was a packaged class or
whatever, well....that's a little worse. But this appears to be the most
common solution to this issue.

Cheers,

Raymond



-----Original Message-----
From: Guo-***@sybase.com [mailto:Guo-***@sybase.com]
Sent: Tuesday, July 01, 2008 2:06 AM
To: ***@ant.apache.org
Subject: how to force recompile everything using javac task

Hi,

how to force recompile everything using javac task?
Javac task always compare modify time with target classes. I want to
recompile java source no matter target classes exists and newer.

Is there any options to achieve this?

Thanks,

[G***@sybase.com]

Hi Raymond,

Thanks for your reply.
Actually I have two <javac> task in my build.xml. First <javac> task would
compile everything from src dir "Adir" and jar it. Second <javac> task
will compile a few java file from "Bdir" which could override some of
first ones and create another jar again. If I put a delete task before
second javac task, I would need to selectively delete some java classes
instead of deleting the whole output directory which is a little bit
complex :-). It would be nice if there is some other options to do this.
I tried using "touch" java source before second <javac>. It works but it
changes the source code modified time which is not desirable.

Regards,




"Raymond Berg (ALLETE)" <***@mnpower.com>
07/01/2008 07:22 PM
Please respond to
"Ant Users List" <***@ant.apache.org>


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Subject
RE: how to force recompile everything using javac task






I'd have to go with the previous recommendations on this topic and say
that wiping *.class files would be the easiest solution here.

http://mail-archives.apache.org/mod_mbox/ant-user/200509.mbox/%3C4320007
***@steria.com%3E

However, if there are other restrictions such as class files in the same
directory that can't be stripped because it was a packaged class or
whatever, well....that's a little worse. But this appears to be the most
common solution to this issue.

Cheers,

Raymond



-----Original Message-----
From: Guo-***@sybase.com [mailto:Guo-***@sybase.com]
Sent: Tuesday, July 01, 2008 2:06 AM
To: ***@ant.apache.org
Subject: how to force recompile everything using javac task

Hi,

how to force recompile everything using javac task?
Javac task always compare modify time with target classes. I want to
recompile java source no matter target classes exists and newer.

Is there any options to achieve this?

Thanks,

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[Andy Stevens]

Post by G***@sybase.com
Hi Raymond,
Thanks for your reply.
Actually I have two <javac> task in my build.xml. First <javac> task would
compile everything from src dir "Adir" and jar it. Second <javac> task
will compile a few java file from "Bdir" which could override some of
first ones and create another jar again. If I put a delete task before
second javac task, I would need to selectively delete some java classes
instead of deleting the whole output directory which is a little bit
complex :-). It would be nice if there is some other options to do this.
I tried using "touch" java source before second <javac>. It works but it
changes the source code modified time which is not desirable.

Why not <copy> the sources from each of those source directories in
turn to some other directory (build/mergedsrc?), then run a single
<javac> on that directory instead?
Using <copy preservelastmodified="true"> should ensure the javac
doesn't think the combined source files have changed unless the
corresponding ones in the original directory (or their overrides)
have, and therefore shouldn't recompile any classes unless it needs
to.


Andy.

[Geoffrey Mitchell]

Post by Andy Stevens

Post by G***@sybase.com
Hi Raymond,
Thanks for your reply.
Actually I have two <javac> task in my build.xml. First <javac> task would
compile everything from src dir "Adir" and jar it. Second <javac> task
will compile a few java file from "Bdir" which could override some of
first ones and create another jar again. If I put a delete task before
second javac task, I would need to selectively delete some java classes
instead of deleting the whole output directory which is a little bit
complex :-). It would be nice if there is some other options to do this.
I tried using "touch" java source before second <javac>. It works but it
changes the source code modified time which is not desirable.

Why not <copy> the sources from each of those source directories in
turn to some other directory (build/mergedsrc?), then run a single
<javac> on that directory instead?
Using <copy preservelastmodified="true"> should ensure the javac
doesn't think the combined source files have changed unless the
corresponding ones in the original directory (or their overrides)
have, and therefore shouldn't recompile any classes unless it needs
to.
Andy.

Alternately, you could do the delete using a present filter with a
mapper (it's really not so complicated), so you only delete classes with
sources in Bdir. Or copy classes that don't have sources in BDir to an
alternate build dir, so your jar tasks are repeatable. Or merge the
sources as recommended above.

Of course, IMHO, the better solution would be to not have two different
distributions in which the same classes (by name) have different
behaviors. That sounds a little screwy to me. Different
implementations of the same interface? OK One class extends the other
and modifies behaviors? OK Re-compile codebase with a few source files
replaced to change behavior? Kinda sounds like the wrong way to go
about it.

[David Weintraub]

Why not use the "dest" parameter and have the two <javac> task compile
their code to two different directories. That way, when you run your
build.xml again, it doesn't have to recompile everything.

I always use the "dest" parameter of the <javac> task. I mainly do
this, so all code compiles into a special build directory under the
directory where my build.xml is stored. I also build my *.jars there,
etc. That way, my <clean> target only has to delete the special build
directory.

--
David Weintraub

Post by G***@sybase.com
Hi Raymond,
Thanks for your reply.
Actually I have two <javac> task in my build.xml. First <javac> task would
compile everything from src dir "Adir" and jar it. Second <javac> task
will compile a few java file from "Bdir" which could override some of
first ones and create another jar again. If I put a delete task before
second javac task, I would need to selectively delete some java classes
instead of deleting the whole output directory which is a little bit
complex :-). It would be nice if there is some other options to do this.
I tried using "touch" java source before second <javac>. It works but it
changes the source code modified time which is not desirable.
Regards,
07/01/2008 07:22 PM
Please respond to
To
cc
Subject
RE: how to force recompile everything using javac task
I'd have to go with the previous recommendations on this topic and say
that wiping *.class files would be the easiest solution here.
http://mail-archives.apache.org/mod_mbox/ant-user/200509.mbox/%3C4320007
However, if there are other restrictions such as class files in the same
directory that can't be stripped because it was a packaged class or
whatever, well....that's a little worse. But this appears to be the most
common solution to this issue.
Cheers,
Raymond
-----Original Message-----
Sent: Tuesday, July 01, 2008 2:06 AM
Subject: how to force recompile everything using javac task
Hi,
how to force recompile everything using javac task?
Javac task always compare modify time with target classes. I want to
recompile java source no matter target classes exists and newer.
Is there any options to achieve this?
Thanks,
---------------------------------------------------------------------