how to set JAVA_HOME in launch file?

asked 2011-07-01 17:09:30 -0500

1186 ●29 ●52 ●57

I'd like to set JAVA_HOME environment variable from find-java-home.sh program

http://code.cs.tum.edu/indefero/index...

  < node name="json_prolog" pkg="json_prolog" type="json_prolog"
        args="jsk_semantic_maps"
        launch-prefix='JAVA_HOME=`rosrun rosjava find-java-home.sh`'
        />

produces following error

Roslaunch got a 'No such file or directory' error while attempting to run:

JAVA_HOME=`rosrun rosjava find-java-home.sh` /home/k-okada/ros/diamondback/knowrob-trunk/json_prolog/bin/json_prolog jsk_semantic_maps __name:=json_prolog __log:=/home/k-okada/.ros/log/240f00c8-a37e-11e0-9734-005056c00001/json_prolog-2.log

Please make sure that all the executables in this command exist and have
executable permission. This is often caused by a bad launch-prefix.

but

roslaun jsk_semantic_maps example-eng2-map.launch --args /json_prolog | bash

works.

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answered 2011-07-03 02:10:51 -0500

Lorenz

22731 ●129 ●202 ●316 http://ias.in.tum.de/p...

updated 2011-07-03 21:50:52 -0500

I'm not sure if it is possible to use $() or `` inside roslaunch since it is actually bash syntax and I guess roslaunch just uses python. Instead, I suggest a different solution, something like a wrapper script to run something with JAVA_HOME set correctly. The script could look like this:

#!/bin/bash
export JAVA_HOME=$(rosrun rosjava find-java-home.sh)
exec $@

Then use it as launch-prefix for your node. If you have it working and want it to be added to the rosjava package, please drop me an email.

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How would you tell the launch file to execute the script? I guess the question is: How to use the "launch-prefix" for the node. Thanks in advance!

ubuntuslave ( 2011-07-16 04:32:02 -0500 )edit

Please have a look at the roslaunch documentation (www.ros.org/wiki/roslaunch). In short: <node name="foo" pkg="bar" type="baz" launch-prefix="$(find foo)/with_java_home.sh"/>

Lorenz ( 2011-07-16 08:15:58 -0500 )edit

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answered 2011-07-02 21:21:44 -0500

Martin Günther

11816 ●82 ●159 ●198 https://www.dfki.de/en...

Does running rosrun rosjava find-java-home.sh work? And if you do a roscd rosjava, does find-java-home.sh exist somewhere in the directory you get to?

The version of rosjava that you are using has recently been renamed to rosjava_jni; perhaps you have installed the new rosjava in parallel, and ROS tries to find your script in the wrong package.

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Just a quick note: rosjava hasn't really been renamed yet, only the corresponding wiki page. But at least the debian package will probably be renamed soon :)

Lorenz ( 2011-07-03 02:12:24 -0500 )edit

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how to set JAVA_HOME in launch file?

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