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From "Peter Reilly" <>
Subject Re: Java task, classpath problem
Date Thu, 16 Aug 2007 13:23:57 GMT
The <java> task does strange things with the classloader.
My advice would be to use fork="yes" unless there
is a reason not to.

As regards the exception you are seeing, this is as far
as I can see behaviour as designed.

If one gives a classpath to the <java> task, the classname
*must* be in the classpath, for example:

<path id="empty"/>
<java classname="java.lang.Object" classpathref="empty"/>

-- Could not find java.lang.Object. Make sure you have it in your classpath.

However, there is a bug in ant with regard to the
 com.sun.xml.internal.bind.v2.* classes.
There are in the rt.jar for java6, and these packages need to be
placed in the class. I suspect that your original build file
ran into this bug.

This should be fixed soon, but in the meantime, you should
use fork="yes".


On 8/10/07, Ognjen Blagojevic <> wrote:
> Hi,
> Can someone try to explain this behavior of java ant task:
>    <target name="test1">
>      <java classname="com.sun.xml.internal.bind.v2.ContextFactory"/>
>    </target>
> gives:
>    java.lang.NoSuchMethodException: (...)ContextFactory.main
> Which is what I expected. ContextFactory is class in JRE's lib rt.jar,
> java task can find it, but it does not have main method. However, this task:
>    <path id="emptyClasspath">
>    </path>
>    <target name="test2">
>      <java
>        classname="com.sun.xml.internal.bind.v2.ContextFactory"
>        classpathref="emptyClasspath"/>
>    </target>
> gives
>    Could not find com.sun.xml.internal.bind.v2.ContextFactory.
>    Make sure you have it in your classpath
> Now, I expect when I put classpathref attribute in java task, that JRE
> lib is still in the classpath, but it seems that this is not the case.
> (?) Ant cannot find ContextFactory anymore.
> Is this a bug?
> I use latest released Ant (1.7.0) and Java (1.6.0_02)
> Regards,
> Ognjen
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