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From Frederic Chalons <frederic.chal...@hsoftware.com>
Subject Re: problem with java task attribute jvmarg when value is ""
Date Thu, 29 Dec 2005 14:29:09 GMT

Steve Loughran wrote:

> 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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Hi Steve,

Thank you for your insight.

By the way, I was given another workaround by defining a system property 
as default value.
ex: <property name="arg1" value="-Dtoto="titi" />

This not very elegant but it works as a charm :-)

Regards,
Frederic

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