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From Samuel Monsarrat <samuel.monsar...@kelis.fr>
Subject Migrating form ANT 1.6 to 1.7: xmlproperty
Date Tue, 19 Feb 2008 13:48:05 GMT
I am attempting to migrate a large ANT build system from 1.6 to 1.7 and 
am running into a problem with xmlproperty.
We use xmlproperty massively in our build system and very often "stack" 
several xmlproperty calls in order to build a complex property 'tree', 
where several inter-dependent build files will declare and/or overload 
parts of the tree using xmlproperty.
Our approach however is completely incompatible with ANT 1.7 due to a 
modification to xmlproperty (bug 26286 c.f. 
http://issues.apache.org/bugzilla/show_bug.cgi?id=26286) that forces 
"empty" elements in an XML property tree to be declared.

Consider the following exemple:
===> build_A.xml :
<project  name="Bui_A" default="All">
    <xmlproperty file="about_A.xml"/>
    <import file="build_B.xml"/>
    <target name="All">
        <ant target="Bui_B.main"/>
    </target>
</project>

===> about_A.xml:
<app>
    <version developmentStage="beta"/>
</app>

===> build_B.xml :
<project  name="Bui_B">
    <xmlproperty file="about_B.xml"/>
    <target name="Bui_B.main">
       <echo message="The version number is: '${app.version}'"/>
       <echo message="The development stage is: 
${app.version(developmentStage)}"/>
       <!-- etc.... -->
    </target>
</project>

===> about_B.xml:
<app>
    <version developmentStage="final">2.4.0</version>
</app>

The aim is : When running build_A.xml use most of about_B.xml but 
overload certain parts of it with about_A.xml

In ANT 1.6 about_A.xml would only set property 
app.version(developmentStage) effectively overloading the 
developmentStage defined in about_B.xml, but with ANT 1.7, about_A.xml 
also sets the property app.version to "empty" thus making it impossible 
for about_B.xml to define it as 2.4.0.

In ANT 1.6 the output  is:
[echo] The version number is: '2.4.0'
[echo] The development stage is: 'beta'

in ANT 1.7 the output is:
[echo] The version number is: ''
[echo] The development stage is: 'beta'
 
This makes it impossible to use xmlproperty to overload a single path in 
a complex property tree, and therefore destroys one of the main features 
of the task as far as I can see.
Has anybody come across the same problem? any workaround?
Regards,
Samuel.


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