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Posted to user@ant.apache.org by stanS <st...@ml.com> on 2007/07/30 19:00:04 UTC
Getting classpath attribute of custom task
Lets say I have a taskdef in the build.xml
<taskdef name="mytask"
classname="MyTask"
classpath="path-to/my.jar" />
How do I get the 'classpath' part in the custom task that derived from Ant
Task class?
Could you point me to the right API?
I want to use that classpath back with a 'java' task.
Thanks
Stan.
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Re: Getting classpath attribute of custom task
Posted by stanS <st...@ml.com>.
It helps, thx.
Do you think this will also handle both the cases where classpath is defined
in <taskdef> and
mytask.jar is in ANTHOME\lib or elsewhere?
if (this.getClass().getClassLoader() instanceof AntClassLoader){
AntClassLoader antClassLoader =
(AntClassLoader)this.getClass().getClassLoader();
taskClasspath = System.getProperty("java.class.path") + ";" +
antClassLoader.getClasspath();
}
else {
taskClasspath = System.getProperty("java.class.path");
}
Path classpath = new Path(getProject());
classpath.setPath(taskClasspath);
javaTask.setClasspath(taskClasspath);
Originally when I started it, I didn't want to wrap it with <java>. My jar
file has some external dependencies on JAXB, Spring etc. I can only succeed
when I copy it to Ant/lib. Injecting my own classpath into Ant class loader
is too challenging for me. I believe it is quite common situation for task
writer. I am interested to learn how to do it too if possible.
thanks again.
Peter Reilly-2 wrote:
>
> The classpath attribute is not available to the created task.
>
> In the task one can use MyTask.class.getClassLoader() to
> get the classloader that loaded the task.
> If this is of type AntClassloader, one can use
> AntClassloader.getClassPath()
> to get the path used in the loader.
>
> However there are a number of issues with this:
> - the MyTask may be in a system classpath, or other classpath - in which
> case, the classloader seen will not be the classloader used by
> <taskdef>
> - there must be other means to achive the same goal.
> - for example keep a reference to the path use use this refernce for
> the <java> task.
>
> Peter
>
>
> On 7/30/07, stanS <st...@ml.com> wrote:
>>
>> Lets say I have a taskdef in the build.xml
>> <taskdef name="mytask"
>> classname="MyTask"
>> classpath="path-to/my.jar" />
>>
>> How do I get the 'classpath' part in the custom task that derived from
>> Ant
>> Task class?
>> Could you point me to the right API?
>>
>> I want to use that classpath back with a 'java' task.
>>
>> Thanks
>> Stan.
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Getting-classpath-attribute-of-custom-task-tf4171205.html#a11866788
>> Sent from the Ant - Users mailing list archive at Nabble.com.
>>
>>
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>> To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
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>>
>
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Re: Getting classpath attribute of custom task
Posted by Peter Reilly <pe...@gmail.com>.
The classpath attribute is not available to the created task.
In the task one can use MyTask.class.getClassLoader() to
get the classloader that loaded the task.
If this is of type AntClassloader, one can use AntClassloader.getClassPath()
to get the path used in the loader.
However there are a number of issues with this:
- the MyTask may be in a system classpath, or other classpath - in which
case, the classloader seen will not be the classloader used by <taskdef>
- there must be other means to achive the same goal.
- for example keep a reference to the path use use this refernce for
the <java> task.
Peter
On 7/30/07, stanS <st...@ml.com> wrote:
>
> Lets say I have a taskdef in the build.xml
> <taskdef name="mytask"
> classname="MyTask"
> classpath="path-to/my.jar" />
>
> How do I get the 'classpath' part in the custom task that derived from Ant
> Task class?
> Could you point me to the right API?
>
> I want to use that classpath back with a 'java' task.
>
> Thanks
> Stan.
>
> --
> View this message in context: http://www.nabble.com/Getting-classpath-attribute-of-custom-task-tf4171205.html#a11866788
> Sent from the Ant - Users mailing list archive at Nabble.com.
>
>
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> To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
> For additional commands, e-mail: user-help@ant.apache.org
>
>
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