"Unknown Source" in Stacktrace

When compiled java source with Ant any Exception thrown from these compiled classes doesnt show line numbers. This seems to be a default setting in Ant.
http://ant.apache.org/manual/CoreTasks/javac.html

BUILD FAILED
java.lang.NullPointerException
        at com.mycompany.myapp.MyClass.doSomething(Unknown Source)

To get back the line numbers in the Exception Stacktrace add the below options to the javac task.

debug="on"


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