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From Steve Loughran <ste...@apache.org>
Subject Re: problem with java task attribute jvmarg when value is ""
Date Thu, 29 Dec 2005 13:50:27 GMT
Frederic Chalons wrote:
> Hi,
> 
> My problem involved the attribute jvmarg set to a property which value 
> is ""...
> 
> Using Ant 1.6.4, I am using the java task to launch various process:
> 
>    /        <java classname="${classname}">/
>    /            <arg value="${arg1}" />/
>    /            <arg value="${arg2}" />/
>    /            <jvmarg value="${jvmarg1}" />/
>    /            <jvmarg value="${jvmarg2}" />/
>    /        </java>/
> 
> For each class the properties (arg1, arg2, jvmarg1, jvmarg2,etc. ) are 
> loaded from xml file.
> After that, for each undefined property, its value is set to "".
> As a property cannot be overwritten, it behaves as defining a default 
> value.
> 
> This is working fine as long as jvmarg1 & jvmarg2 properties have a 
> value but breaks when they use "" as default value.
> Running ant -debug gives the following:
> 
>    /''/
>    /''/
> 
>    /The ' characters around the executable and arguments are/
>    /not part of the command./
>    /     [java] Exception in thread "main" java.lang.NoClassDefFoundError:/
> 
>    /BUILD FAILED/
> 
> It seems that empty jvmarg is the caused but I need to find a way to 
> inhibit jvmarg attribute when the associated property is not used.

Alternatively, you need a default JVM argument that can be used multiple 
times and has no side effects, and make that the default.

the -ea option to enable assertions for a package may work there...


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