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From Jean-Noël Rivasseau <elva...@gmail.com>
Subject Re: How to pass Java system properties to a task defined in a taskdef ?
Date Sat, 25 Jul 2009 04:53:03 GMT
I finally found the answer to this; Ant properties set via -D are not the
same as Java properties set via -D when loading Java. When I set the Java
property and not the Ant property, it works.

Thanks.

On Fri, Jul 24, 2009 at 5:06 AM, Jean-Noël Rivasseau <elvanor@gmail.com>wrote:

> Thanks for this answer. The problem however is that I don't control the
> code of the Ant task - I am patching the build system of a big package
> (Groovy) to build on Gentoo Linux, so the only thing I can / should modify
> is the buildfile. Is there a way to tell the Java code that will be run
> inside the task that the current system property "user.home" is set to "bar"
> ?
>
> Jean-Noel
>
>
> On Thu, Jul 23, 2009 at 8:35 PM, Avlesh Singh <avlesh@gmail.com> wrote:
>
>> >
>> > My original question was completely misunderstood
>> >
>> Probably because you never mentioned the usage inside a custom task.
>>
>> Use these within you Ant tasks:
>> this.getOwningTarget().getProject().getProperty("user.home");
>> this.getOwningTarget().getProject().getProperties();
>>
>> Cheers
>> Avlesh
>>
>> On Thu, Jul 23, 2009 at 11:55 PM, Jean-Noël Rivasseau <elvanor@gmail.com
>> >wrote:
>>
>> > Hmm. My original question was completely misunderstood. Here is what I
>> am
>> > doing:
>> >
>> > ant -Duser.home="bar"
>> >
>> > The build file looks like this:
>> >
>> > <echo message="${user.home}" />
>> > <taskdef name="mytask" classname="com.example.Test" />
>> > <mytask />
>> >
>> > Then the code in Test.java goes like this:
>> >
>> > System.out.println("Property: " + System.getProperty("user.home"));
>> >
>> > The result of the Ant echo message is what I expected (eg, it prints out
>> > bar). However when the mytask task is ran, /home/elvanor is printed
>> out...
>> > and I need to have the user.home property set for mytask ! Why this
>> happens
>> > and what can I do about it?
>> >
>> > Jean-Noel
>> >
>> >
>> > On Thu, Jul 23, 2009 at 7:34 PM, Scot P. Floess <sfloess@nc.rr.com>
>> wrote:
>> >
>> > >
>> > > You can echo that property using
>> > >
>> > > <echo message = "${user.home}"/>
>> > >
>> > > Its automagically available via the Java system property...
>> > >
>> > >
>> > > On Thu, 23 Jul 2009, Scot P. Floess wrote:
>> > >
>> > >
>> > >> Well, user.home is a Java system property.  I'm guessing the intent
>> is
>> > to
>> > >> change that system property internal to the script?
>> > >>
>> > >> On Thu, 23 Jul 2009, Avlesh Singh wrote:
>> > >>
>> > >>  If you are trying to read the environment variable "user.home", this
>> is
>> > >>> how
>> > >>> you need to it:
>> > >>>
>> > >>> <property environment="env"/>
>> > >>> <echo message = "${env.user.home}"/>
>> > >>>
>> > >>> Cheers
>> > >>> Avlesh
>> > >>>
>> > >>> On Thu, Jul 23, 2009 at 8:18 PM, Scot P. Floess <sfloess@nc.rr.com>
>> > >>> wrote:
>> > >>>
>> > >>>
>> > >>>> Are you trying to set it within your build.xml - like so:
>> > >>>>
>> > >>>> <property name="user.home" value="alpha"/>
>> > >>>>
>> > >>>> If so, I don't think that is going to work...
>> > >>>>
>> > >>>> For example try this out:
>> > >>>>
>> > >>>> <project>
>> > >>>>   <property name="user.home" value="alpha"/>
>> > >>>>   <echo message = "${user.home}"/>
>> > >>>> </project>
>> > >>>>
>> > >>>> When I run this, I get:
>> > >>>>
>> > >>>> Buildfile: build.xml
>> > >>>>    [echo] /home/sfloess
>> > >>>>
>> > >>>> However, if I do this:
>> > >>>>
>> > >>>> ant -Duser.home="bar"
>> > >>>>
>> > >>>> I get:
>> > >>>>
>> > >>>> Buildfile: build.xml
>> > >>>>    [echo] bar
>> > >>>>
>> > >>>> Unless I am wrong, once Ant starts and those default properties
are
>> > set
>> > >>>> (in
>> > >>>> this case from Java system properties), it won't be reset to
the
>> new
>> > >>>> value.
>> > >>>>  However, doing so on the command line sets it first.
>> > >>>>
>> > >>>>
>> > >>>> On Thu, 23 Jul 2009, Scot P. Floess wrote:
>> > >>>>
>> > >>>>
>> > >>>>  Just curious - you mention a modified user.home property...
 How
>> are
>> > >>>>> you
>> > >>>>> modifying it?
>> > >>>>>
>> > >>>>> On Thu, 23 Jul 2009, Jean-Noël Rivasseau wrote:
>> > >>>>>
>> > >>>>>  Hello,
>> > >>>>>
>> > >>>>>>
>> > >>>>>> I am launching Ant with a modified user.home property.
This
>> property
>> > >>>>>> is
>> > >>>>>> apparently not passed down to one of my tasks, defined
in a
>> taskdef.
>> > >>>>>> Why?
>> > >>>>>> Does Ant fork a new VM for executing such tasks? In
any case, how
>> > can
>> > >>>>>> I
>> > >>>>>> pass
>> > >>>>>> this property to the task being executed, it's essential
for me.
>> > >>>>>>
>> > >>>>>> I had a look at the source but could not really understand
where
>> to
>> > >>>>>> look
>> > >>>>>> to
>> > >>>>>> understand how things worked.
>> > >>>>>>
>> > >>>>>> Thanks,
>> > >>>>>>
>> > >>>>>> Jean-Noel
>> > >>>>>>
>> > >>>>>>
>> > >>>>>>  Scot P. Floess
>> > >>>>> 27 Lake Royale
>> > >>>>> Louisburg, NC  27549
>> > >>>>>
>> > >>>>> 252-478-8087 (Home)
>> > >>>>> 919-890-8117 (Work)
>> > >>>>>
>> > >>>>> Chief Architect JPlate   http://sourceforge.net/projects/jplate
>> > >>>>> Chief Architect JavaPIM  http://sourceforge.net/projects/javapim
>> > >>>>>
>> > >>>>> Architect Keros          http://sourceforge.net/projects/keros
>> > >>>>>
>> > >>>>>
>> > >>>>>  Scot P. Floess
>> > >>>> 27 Lake Royale
>> > >>>> Louisburg, NC  27549
>> > >>>>
>> > >>>> 252-478-8087 (Home)
>> > >>>> 919-890-8117 (Work)
>> > >>>>
>> > >>>> Chief Architect JPlate   http://sourceforge.net/projects/jplate
>> > >>>> Chief Architect JavaPIM  http://sourceforge.net/projects/javapim
>> > >>>>
>> > >>>> Architect Keros          http://sourceforge.net/projects/keros
>> > >>>>
>> > >>>>
>> > >>>>
>> ---------------------------------------------------------------------
>> > >>>> To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
>> > >>>> For additional commands, e-mail: user-help@ant.apache.org
>> > >>>>
>> > >>>>
>> > >>>
>> > >> Scot P. Floess
>> > >> 27 Lake Royale
>> > >> Louisburg, NC  27549
>> > >>
>> > >> 252-478-8087 (Home)
>> > >> 919-890-8117 (Work)
>> > >>
>> > >> Chief Architect JPlate   http://sourceforge.net/projects/jplate
>> > >> Chief Architect JavaPIM  http://sourceforge.net/projects/javapim
>> > >>
>> > >> Architect Keros          http://sourceforge.net/projects/keros
>> > >>
>> > >>
>> > > Scot P. Floess
>> > > 27 Lake Royale
>> > > Louisburg, NC  27549
>> > >
>> > > 252-478-8087 (Home)
>> > > 919-890-8117 (Work)
>> > >
>> > > Chief Architect JPlate   http://sourceforge.net/projects/jplate
>> > > Chief Architect JavaPIM  http://sourceforge.net/projects/javapim
>> > >
>> > > Architect Keros          http://sourceforge.net/projects/keros
>> > >
>> > >
>> > > ---------------------------------------------------------------------
>> > > To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
>> > > For additional commands, e-mail: user-help@ant.apache.org
>> > >
>>
>

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