PHP command shell_exec() not working for my custom Java app5

Question

I have made a custom java program to output a license and am trying to run it in php.

$deviceid="12345";
$command_app = 'java -jar /home/myname/secure/mycommand.jar ';
$privateKey = 'QEFAASCAmEwggJdAgE';
$command_app_args = "\"$privateKey\" deviceid=$deviceid";
$command=$command_app.$command_app_args;
$license = shell_exec($command);

The problem is that $license is empty every time, I tried to print out the $command using

echo $command;

and then ran that command directly in the linux terminal and the xml output was correct.

I am using

System.out.println()

in the java app to print all the xml output. I tried something simple like

shell_exec('ls -l') ;

and sure enough if worked.

What might I be doing wrong?

What do you get for which java?

Pekka
– Pekka

2010-06-09 15:23:37 +00:00
Commented Jun 9, 2010 at 15:23 — Pekka
– Pekka, Commented Jun 9, 2010 at 15:23

ircmaxell · Accepted Answer · 2010-06-09 15:33:17Z

2

My first instinct is that the command java is not in PHP's shell path. Try something like this:

$command_app = '`which java` -jar /home/myname/secure/mycommand.jar ';

The command which java will return the full path to the java executable...

answered Jun 9, 2010 at 15:33

ircmaxell

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3 Comments

jax Over a year ago

$java = which java; echo $java; produced nothing, however $java = ls -l; echo $java; worked

jax Over a year ago

which ls produced /bin/ls so for some reason php can't locate java even with the which command

jax Over a year ago

I used the full path /usr/java/jdk1.6.0/bin/java in the php command instead of java and it worked.

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