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Can Ant launch two java applications concurrently

Answer 1

+3 A:

Look at the doc for Ant's <exec> directive - you should be able to add a call to the target application with <exec> that will amp off by using the "spawn" parameter.

Edit: sorry, "amp off" is slang for running a process in the background, which allows Ant to continue working while that process runs.

Arkaaito 2010-01-29 00:06:32

I see, the only problem that I have with exec is that running java programs across OS is very different. I would need an exec for every os, no?

Sandro 2010-01-29 00:31:28

Answer 2

+1 A:

You can certainly spawn processes from ant. Here's a simple example:

<target name="sleeper">
    <exec executable="sleep" spawn="yes">
       <arg value="100" />
    </exec>
</target>

If you run this task* you'll see ant run to completion, but a ps will show the sleep persists.

The java task also supports spawn

*the example assumes a UNIX variant OS as it uses the sleep command.

martin clayton 2010-01-29 00:09:11

Is there an OS independent solution?

Sandro 2010-01-29 00:32:30

Using the java task with spawn is OS independent. If you want to spawn different executables then you are certainly heading into an OS specific world. But the exec task allows you to specify which OS's the task is ran for.. (run this only on windows, run this only on unix, etc)

Matt 2010-01-29 01:38:59

Answer 3

+2 A:

You can spawn two java programs from within an ANT parallel task.

<parallel>
  <sequential>
    <java fork="true" classname="prog1 .... >
  </sequential>
  <sequential>
    <sleep seconds="30"/>
    <java fork="true" classname="prog2.... >
  </sequential>
</parallel>

The sleep task in the second thread could be replace by a waitfor condition.

Mark O'Connor 2010-02-01 22:53:13

Thank you! That is exactly what I was looking for!

Sandro 2010-02-06 05:59:02

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Can Ant launch two java applications concurrently

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