Answer:
Ant properties are immutable; they cannot be changed once initialized. However, it can be done in the following way although it causes the immutable property violation:
<?xml version="1.0"?>
<project name="example" default="run">
<taskdef name="groovy"
classname="org.codehaus.groovy.ant.Groovy"
classpath="lib/groovy-all-1.1-rc-1.jar"/>
<target name="run">
<echo>java.library.path = ${java.library.path}</echo>
<groovy>
properties["java.library.path"] = "changed"
</groovy>
<echo>java.library.path = ${java.library.path}</echo>
</target>
</project>
<?xml version="1.0"?>
<project name="example" default="run">
<taskdef name="groovy"
classname="org.codehaus.groovy.ant.Groovy"
classpath="lib/groovy-all-1.1-rc-1.jar"/>
<target name="run">
<echo>java.library.path = ${java.library.path}</echo>
<groovy>
properties["java.library.path"] = "changed"
</groovy>
<echo>java.library.path = ${java.library.path}</echo>
</target>
</project>
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