JavaUtils

Utilities to help with Java development and deployment

Module jar.py

Jar Class

Python class to parse Java jar files

Methods

Jar(jarfile)

Constructor for Jar class. jarfile can be a string pathname or a file object

Jar.getEntry(name)

Retrieves the jar file entry name as a file object

Jar.findEntries(regex)

Returns a list of entries in the jar file that match the given regular expression

Jar.readManifest()

Returns the jar manifest entries as a dictionary

getJars.py

Python script to look inside an executable jar file, parse out its classpath, optionally use any embedded pom.xml files to resolve jar dependencies, and then make symbolic links for all the dependencies in the classpath pointing to the local on-disk maven repository jars.

Usage

$ python getJars.py [-r] jar-file
 where -r means do maven dependency resolution first

What this script does is the following:

1. If the -r flag is specified, it finds the pom.xml file in the jar file, and does a mvn dependency:resolve on the pom file, which downloads all the dependencies into the local Maven repository (usually located in ~/.m2/repository)
2. Next, it retrieves the Class-Path entry from the jar's META-INF/MANIFEST.MF file, and looks for each entry in the local Maven repository
3. For each jar file dependency it finds, it creates a symbolic link from the value specified in the manifest class path, pointing to the actual jar file in the Maven repository

Thus, assuming all dependencies are resolved and found, your executable jar file should be have all its dependencies resolved, and should run with java -jar jar-file.