Can anybody explain somewhat confusing ant property and j:set interaction?

[Colin Sampaleanu]

I am somewhat confused about how ant properties and values set via jelly:core's 'set' tag work.

The xdoclet plugin has a property, call it 'x', that is set by default in its project.properties file. I need to override this, which I am attempting to do in a preGoal in my maven.xml file.

if I do
<property name="x" value="y"/>
in the pregoal, this will always override the default plugin property.

(As would be expected, if I have a value in my project.properties for x (and nowhere else), that also overrides the default plugin property.)

but if I do
<j:set var="x" value="y"/>
then if there is no value for x in my project.properties, the set seems to have no effect, and the plugin's default value is used, while if there is a value for x in my project.properties file, then the set _does_ seem to have an effect, and the value is set as above.

I don't understand this last bit of behavior. What is the existence of a setting for x in my project properties have to do with whether or not I can later override x with a j:set in jelly code?

Regards, Colin





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