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From Martin Gainty <mgai...@hotmail.com>
Subject RE: <exec> called from a nested Ant session started with <java> - not terminating?
Date Wed, 10 Oct 2007 18:17:58 GMT

Hi keith-
pure speculation but what if your start_weblogic.xml uses start /B (instead of cmd.exe /C)..
Anyone?Martin--______________________________________________Disclaimer and confidentiality
noteEverything in this e-mail and any attachments relates to the official business of Sender.
This transmission is of a confidential nature and Sender does not endorse distribution to
any party other than intended recipient. Sender does not necessarily endorse content contained
within this transmission.> > Hi,> > Versions: Ant 1.6.2 and 1.6.5, Java 1.5.0_05.>
> I have an Ant script that needs to call an Ant target with a different> environment
(specifically with a different -lib setting) so I use <java>> to run this in a separate
process as follows (the -lib is removed from> the arg sections here because the problem
occurs even without it):> > <java failonerror="true" fork="true"> classname="org.apache.tools.ant.launch.Launcher">>
<env key="PATH" path="${java.library.path}"/>> <jvmarg value="-Dant.home=${ant.home}"/>>
<arg value="-f"/>> <arg value="start_weblogic.xml"/>> <!-- -lib setting
omitted -->> <classpath>> <pathelement path="${ant.home}/lib/ant-launcher.jar"/>>
</classpath>> </java>> <echo>java has terminated</echo>>
> > Now, the start_weblogic.xml build script runs another process with an> <exec>
task with spawn="true", so that it should outlive the Ant script.> Here's the target:>
> <target name="wls-start-server"> > <echo message="Start Weblogic Application
Server"/>> <exec spawn="true" dir="${wls-domain-dir}" executable="cmd.exe"> os="Windows
2000,Windows 2003,Windows XP">> <arg line="/c startWebLogic.cmd"/>> </exec>>
> <waitfor maxwait="5" maxwaitunit="minute" checkevery="20000"> checkeveryunit="millisecond">>
<http url="http://localhost:7001/console"/>> </waitfor>> <echo>WLS
has started</echo>> </target>> > > Now, if I run start_weblogic.xml
directly from the command line, with> the appropriate -lib settings etc., all is well,
the script runs and> starts the server, leaving it running after the script has completed.>
> However, if I call the start_weblogic.xml script indirectly, from my> other script
using the <java> task, it starts the server, I see the> <echo> message "WLS
has started", and the BUILD SUCCESSFUL message.> However, the <java> task does not
appear to terminate until the other> process (started with spawn="true" from a forked JVM)
has been> terminated. Only then do I see the <echo> message "java has terminated">
from the first fragment. It appears that the nested Ant script has> completed, but the
outer <java> task doesn't shut down. Interestingly,> the extra java.exe for the nested
Ant script disappears from the Windows> Task Manager at the same time as the BUILD SUCCESSFUL
message, so it> seems that the outer Ant script running the <java> task hasn't detected>
this somehow.> > Incidentally, the behaviour is identical if I use the <forget>
task from> Ant-Contrib instead of the spawn="true" attribute.> > Can anyone suggest
what is going wrong here?> > Thanks,> Keith> > > Axiom Systems Limited is
a limited company registered in England and> Wales. Registered number: 2358771. Registered
office: One Forbury> Square, The Forbury, Reading, Berks RG1 3EB> > --------------------------------------------------------------------->
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