Java Wrapper to Perl/Python code

Question

I have to deploy some Web Services on a server that only supports the Java ones, but some of them will be done using perl or python. I want to know if is possible to develop a Java wrapper to call a specific code written in perl or python. So, I want to have all the Web Services in Java, but some of them will call some code using other languages.

Thanks in advance. Regards, Ukrania

Pizarro

Generating a .class file from the perl/python script is also a solution, because I can deploy the web service using only the .class file. – Pizarro

Answer 1

This depends heavily upon your needs. If Jython is an option for the Python code (it isn't always 100% compatible), then it is probably the best option there. Otherwise, you will need to use Java's Process Builder to call the interpretters directly and return the results on their output stream. This will not be fast (but then again, Jython isn't that fast either, relative to regular Java code), but it is an extremely flexible solution.

Simpleton

I have to support python completely, I just want to call or use the code that other programmers had made, in the easiest way possible. In the end, I have to publish this features using web services, that need to be made on java because WSO2 only supports Java Web Services (I use WSO2 to make the Web Services secure). – Pizarro

Yes, I think writing scripts to call the interpretter using ProcessBuilder is going to be the most compatible choice. – Simpleton

Answer 2

For the Python part of it you can use Jython to run Python code right from your Java virtual machine. It'll integrate fully with your Java code as a bonus.

Pyrrhuloxia

I will have a Python program ready to the final release, using Jython it will call the functions that are already written or I need to rewrite the code? – Pizarro

Yes you should be able to call existing Python functions. Jython can run almost any Python code but not all Python standard modules are available in Jython. I believe this is particularly likely if the modules are written in C. – Pyrrhuloxia

Answer 3

For Perl, use Inline::Java. There are several options for integrating the code; you can call a separate process or you can use an embedded interpreter.

Cortese

yes but this solution is to call Java code inside Perl, I want to call Perl code from Java – Pizarro

Answer 4

For Python you can use the Java Scripting API.
A Perl implementation is sadly still missing.

Cental

Answer 5

There's something I used a while back called Jython which allows you to execute Python code from Java. It was a little quirky, but I got it to do what I needed.

http://www.jython.org

Eremite