Ant property value as parameter variable In JENKINS - jenkins

Question

I am working on Jenkins.
I have built a job1 with secret text: username and Password variable as
APP1_Dev_password
And using this variable from my ANT script by sending this variable in the predefined parameter to my other job2. I am accessing this variable using
<property name="DBPassword" value="${APP1_Dev_password}"/>
This works well.
But my ant script is a single generalized script for all my applications.
So I have get this APP1_Dev_password string constructed automatically from my ant script using
<property name="constructPasswordVariable" value="${APPLICATIONNAME}_${ENVIRON}_password"/>
<echo message= "constructPasswordVariable: ${constructPasswordVariable}" />
This clearly prints me constructPasswordVariable as APP1_Dev_password.
Now i have to use this value of the constructPasswordVariable property as a variable to fetch from the job1.
<echo message= "PasswordValue: ${${constructPasswordVariable}}" />
This statement fails. Can you guide me of how to work on this.
SOLUTION
<property name="constructPasswordVariable" value="${env.Module}_${env.Environment}_password"/>
<echo message= "constructPasswordVariable: ${constructPasswordVariable}" />
<propertycopy name="prop" from="${constructPasswordVariable}"/>
<echo message= "ENV VALUE: ${prop}" />
Output
constructPasswordVariable: APP1_Dev_password
ENV VALUE: asdhasd

Answer 1

Ant says nested property is not directly supported. Referring documentation from here
However, it can be achieved using library Flaka
Sample: from above reference
<project xmlns:fl="antlib:it.haefelinger.flaka">
<fl:install-property-handler/>
<property name="foo" value="foo.value"/>
<property name="var" value="foo" />
<property name="buildtype" value="test"/>
<property name="appserv_test" value="//testserver"/>
<echo>
#{${var}} = foo.value
<!-- nested property -->
#{appserv_${buildtype}}
</echo>
</project>
There is another reference here which make it possible without additional library as well.
Sample:
<project default="test">
<property name="foo" value="ABC"/>
<property name="pfoo" value="foo"/>
<target name="test">
<echo file="deref.properties">
deref: $${${pfoo}}
</echo>
<property file="deref.properties"/>
</target>