Run a Java main class using its relative path? (Python)

Question

I am using Python to execute the JVM for a specified Java class, like so:

import subprocess
output = subprocess.check_output("java MyJavaClass")

However, the Java class is not in the same directory as the Python script, so this does not work. It is in a bin directory two directories up.

So I was hoping it would be possible to do something like below, but it doesn't work:

output = subprocess.check_output("java ../../bin/MyJavaClass")

Any ideas?

What is the working directory when that Python code runs? os.getcwd() — Thomas K
– Thomas K, Commented May 1, 2012 at 11:55

Moritz Petersen · Accepted Answer · 2012-05-01 11:57:52Z

3

You need to set the classpath, like this:

java -classpath ../../bin MyJavaClass

Please note, that if your class belongs to a certain package, you have to use the FQN (Full Qualified Name):

java -classpath ../../bin my.package.MyJavaClass

answered May 1, 2012 at 11:57

Moritz Petersen

13.1k3 gold badges42 silver badges46 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

erikxiv · Accepted Answer · 2012-05-01 12:01:52Z

1

Try

output = subprocess.check_output("java MyJavaClass", cwd="../../bin/")

When running Java, the directory structure implies a package structure, so it is required to execute java from the correct directory (unless using classpath).

answered May 1, 2012 at 12:01

erikxiv

4,0952 gold badges26 silver badges22 bronze badges

1 Comment

XåpplI'-I0llwlg'I - Over a year ago

Accepted this answer since it keeps the "directory changing" in Python. Both good answers though.

Collectives™ on Stack Overflow

Run a Java main class using its relative path? (Python)

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related