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Home/ Questions/Q 649023
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T21:53:50+00:00 2026-05-13T21:53:50+00:00

I have a java class and I need to debug it (put breakpoints and

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I have a java class and I need to debug it (put breakpoints and continue using F6). I am using ANT script to init, build, deploy and run the code. I am using:

<javac srcdir="${src.dir}" destdir="${classes.dir}" debug="true" debuglevel="lines,vars,source">

..........

</javac>

But when I place the breakpoint in a line in my foo.java class and I run the ant script (the run part, Right Click on run–>Debug As–>Ant Build), Eclipse does not stop at that line of code.

What am I missing out?!

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  1. Editorial Team
    Editorial Team
    2026-05-13T21:53:51+00:00Added an answer on May 13, 2026 at 9:53 pm

    In the <java> ant task you should add two jvm parameters (<jvmarg> IIRC) to turn on debugging:

     -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5432
    

    This will launch the java program with debugging turned on and the program will be ready to accept debugger connections on port 5432. Then you should use your IDE’s remote debugging facility and direct it to connect to port 5432.

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