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From David Maclean <da...@cm.co.za>
Subject Re: the java task
Date Tue, 04 Jul 2000 10:19:19 GMT

On Tue, 4 Jul 2000, Yannick Menager wrote:

> 
> piece of cake... just use URLClassLoader, and use "file:" URLs ....
> You can obtain automatically the URL using File.toURL() .. but that's only available
on 1.2 forwards
> 
> 

Sure but I thought that a feature like dynamic classpath should be
available when using Ant with jdk 1.1. I am not sure of the policy of
adding features/etc when the depend on jdk 1.2+.

> 
> 
> 
> 
> David Maclean <david@cm.co.za> on 04/07/2000 10:48:09
> 
> Please respond to ant-dev@jakarta.apache.org
> 
> To:   ant-dev@jakarta.apache.org
> cc:
> Subject:  Re: the java task
> 
> 
> 
> On Tue, 4 Jul 2000, Yannick Menager wrote:
> 
> >
> >
> > Couldn't somebody patch that task so that it uses a classloader to loads the indicated
classpath.
> 
> I was looking into the possibility of having dynamic classpaths via a
> custom class loader. I am still looking at the feasibility of it. Any
> comments/suggestions welcome. I think it is possible. This feature, I
> think would be welcome.
> 
> I came across a similar problem when I wanted to use Ant to
> produce nightly builds by using the Cvs and Ant tasks as well as other
> custom tasks that I was writing. The problem was that without forking,
> adding to the classpath is not currently possible and some of the
> sub-builds required extra classes. To get around it I would have had to
> have a copy of all the zip/jar files in the classpath of the master Ant
> build. I did not like this. If there was an option for dynamic classpaths
> then this would have been trivial as in the Ant sub-build I could have
> done something like the following (in the build.xml file):
> 
> <classpath>
>   <path>activation.jar</path>
>   <path>mail.jar</path>
>   <path>xerces.jar</path>
> </classpath>
> 
> >
> > I'd do it myself if I had time to breathe :-)
> >
> >
> >
> >
> >
> > Ken Wood <kwood@i2.com> on 04/07/2000 04:54:38
> >
> > Please respond to ant-dev@jakarta.apache.org
> >
> > To:   ant-dev@jakarta.apache.org
> > cc:
> > Subject:  Re: the java task
> >
> >
> > That is correct - the classpath in effect at the time you
> > do a java task with fork="no" is the classpath that
> > Ant was invoked with. You are just running your task
> > within the JVM that is running ant. But if you set fork="yes"
> > then you are starting a new JVM with the specified args and
> > classpath.
> >
> > "Allen, Michael B (RSCH)" wrote:
> >
> > > Hello,
> > >
> > > I'm having a little trouble with the java task. If I have a target like
> > > below it doesn't work:
> > >
> > >      86   <target name="run_http">
> > >      87     <java classname="com.sun.jini.tool.ClassServer"
> > >      88        fork="no"
> > >      89        jvmargs=""
> > >      90        classpath="lib/jini1_0_1/lib/tools.jar"
> > >      91        args="-dir ${codebase.dir} -port ${codebase.port}"/>
> > >      92   </target>
> > >
> > > [miallen@prodlinux swooshmail]$ ./bin/build run_http
> > > Buildfile: etc/build.xml
> > > Project base dir set to: /home/miallen/NYU/vjkproj/swooshmail
> > > Executing Target: run_http
> > >
> > > BUILD FATAL ERROR
> > >
> > > etc/build.xml:91: Could not find com.sun.jini.tool.ClassServer. Make sure
> > > you have it in your classpath
> > >
> > > [miallen@prodlinux swooshmail]$ ls lib/jini1_0_1/lib/
> > > jini-core.jar         jini-examples.jar  mahalo-dl.jar  reggie-dl.jar
> > > sun-util.jar
> > > jini-examples-dl.jar  jini-ext.jar       mahalo.jar     reggie.jar
> > > tools.jar
> > > [miallen@prodlinux swooshmail]$ echo $CLASSPATH
> > > /usr/local/javalibs/classes111.zip
> > >
> > > But if I change fork="yes" then it does work. So I gather the classpath
> > > attribute really has no effect if fork="no" just like the jvm and jvmargs
> > > attributes ehh?
> > >
> > > Thanks,
> > >
> > > Michael B. Allen
> > > Michael_B_Allen@ml.com
> > > http://jcifs.samba.org - MS Windows File and Print Sharing API in 100% Java
> >
> >
> >
> >
> >
> >
> >
> 
> 
> 
> 
> 
> 
> 


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