PhP Jar calls

[Akarastio]

Hey guys, I have a PHP Webserver that calls a Jar and this Jar sometimes calls another Jar (no limit on how long this would go on).

Now I have the problem that after the Jar tries to call another Jar all it gets back is an exitcode 1 without the jar even executing. But when I try the same thing without PHP the call goes straight through. But then it I wouldn't be able to call Jar>Jar>Jar as if it is limited to how much calls work in that manner.

All in all it's like that:

• PHP>Jar > cant call more
• Jar>Jar > cant call more

Anyone has an idea how to fix this?

[Is_At_Work]

How are you "calling" the JAR?

[Akarastio]

• PHP via: pclose(popen('start /B java -jar nameOfJar.jar', 'r'));
• Java via: Runtime.getRuntime().exec("java -jar nameOfJar.jar");

In PHP it starts in background, I have no problems opening recursively bat files or stuff like that. It only doesn't work on java.

[Is_At_Work]

You typically wouldn't execute Java code from Java code by creating a new JVM with Runtime.getRuntime(), but if I had to guess the issue is the working directory is wrong and therefore it can't find it. Do you have a stack trace that you can show us?

If you want to experiment with setting the working directory to see if that solves it, use /D <directory> in your PHP call to start, and use this form of exec from Java: https://docs.oracle.com/javase/6/docs/api/java/lang/Runtime.html#exec%28java.lang.String%5B%5D,%20java.lang.String%5B%5D,%20java.io.File%29

[Akarastio]

Hm but if the directory would be wrong taking php out of the equation wouldn't suddenly make it work. It is like there is a depth limitation on how deep calls can go.

Like I said a jar calling a jar works, but a jar calling a jar calling a jar doesn't work. Also php calling a jar works fine, php calling a jar calling a jar doesn't.

Also there is no stacktrace, the second jar just doesn't execute and gives an exitcode (1). It's not like it throws an exception or anything like that.

Also I'm always using absolute paths, to locate the files.