<javac> rebuilds even if source not changed

[Jean-Rene David-2]

Hello,

If a class is in a package, the <javac> target
always rebuilds it even if the source hasn't
changed. Here's a test case:

$ ant -version
Apache Ant version 1.7.0 compiled on December 13 2006

$ ls
build.xml
Welcome.java

$ cat Welcome.java
package My.Class;
public class Welcome
{
   public static void main(String[] args)
   {
      System.out.println("Hello World!");
   }
}

$ cat build.xml
<?xml version="1.0"?>
<project name="test" default="build" basedir=".">
   <target name="build">
      <mkdir dir="foo" />
      <javac srcdir="." destdir="foo" />
   </target>
   <target name="clean">
      <delete dir="foo" />
   </target>
</project>

$ ant
Buildfile: build.xml

build:
    [mkdir] Created dir: /tmp/testcase/foo
    [javac] Compiling 1 source file to /tmp/testcase/foo

BUILD SUCCESSFUL
Total time: 1 second

Now I just run it again:

$ ant
Buildfile: build.xml

build:
    [javac] Compiling 1 source file to /tmp/testcase/foo

BUILD SUCCESSFUL
Total time: 0 seconds

And it recompiles but shouldn't.

My class is part of the My.Class package, so javac
put it in: foo/My/Class:

$ find
.
./Welcome.java
./build.xml
./foo
./foo/My
./foo/My/Class
./foo/My/Class/Welcome.class

But the <javac> task doesn't recurse the hierarchy
to find the class file. It only looks in the
"destdir" itself. So if I just:

$ touch foo/Welcome.class

Then <javac> doesn't rebuild the file:

$ ant
Buildfile: build.xml

build:

BUILD SUCCESSFUL
Total time: 0 seconds

What idiom am I missing?

Thanks for any input,

--
JR

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[Nicolas Vervelle]

Hi,

Maybe try putting your javafile elsewhere :
* in a src/ dir (so that javac destdir is not a subdirectory of srcdir,
which probably confuses javac)
* by respecting the package / directory structure : it should be in
my/class/ package hierarchy

My 2 cts
Nico


Jean-Rene David <jrdavid@...> wrote on 27/04/2008 04:33:19:

> Hello,
>
> If a class is in a package, the <javac> target
> always rebuilds it even if the source hasn't
> changed. Here's a test case:
>
> $ ant -version
> Apache Ant version 1.7.0 compiled on December 13 2006
>
> $ ls
> build.xml
> Welcome.java
>
> $ cat Welcome.java
> package My.Class;
> public class Welcome
> {
>    public static void main(String[] args)
>    {
>       System.out.println("Hello World!");
>    }
> }
>
> $ cat build.xml
> <?xml version="1.0"?>
> <project name="test" default="build" basedir=".">
>    <target name="build">
>       <mkdir dir="foo" />
>       <javac srcdir="." destdir="foo" />
>    </target>
>    <target name="clean">
>       <delete dir="foo" />
>    </target>
> </project>
>
> $ ant
> Buildfile: build.xml
>
> build:
>     [mkdir] Created dir: /tmp/testcase/foo
>     [javac] Compiling 1 source file to /tmp/testcase/foo
>
> BUILD SUCCESSFUL
> Total time: 1 second
>
> Now I just run it again:
>
> $ ant
> Buildfile: build.xml
>
> build:
>     [javac] Compiling 1 source file to /tmp/testcase/foo
>
> BUILD SUCCESSFUL
> Total time: 0 seconds
>
> And it recompiles but shouldn't.
>
> My class is part of the My.Class package, so javac
> put it in: foo/My/Class:
>
> $ find
> .
> ./Welcome.java
> ./build.xml
> ./foo
> ./foo/My
> ./foo/My/Class
> ./foo/My/Class/Welcome.class
>
> But the <javac> task doesn't recurse the hierarchy
> to find the class file. It only looks in the
> "destdir" itself. So if I just:
>
> $ touch foo/Welcome.class
>
> Then <javac> doesn't rebuild the file:
>
> $ ant
> Buildfile: build.xml
>
> build:
>
> BUILD SUCCESSFUL
> Total time: 0 seconds
>
> What idiom am I missing?
>
> Thanks for any input,
>
> --
> JR
>
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> To unsubscribe, e-mail: user-unsubscribe@...
> For additional commands, e-mail: user-help@...
>

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