deps4j

Tools for determining dependencies of classes. Makes use of the jdeps tool that is part of the Java JDK.

Minimal dependencies

The following class allows you to determine the minimal set of classes required to make a supplied list of classes compile:

com.github.fracpete.deps4j.MinDeps

Help

usage: com.github.fracpete.deps4j.MinDeps
       [-h] --java-home JAVAHOME --class-path CLASSPATH
       --classes CLASSES [--additional ADDITIONAL] [--output OUTPUT]
       packages [packages ...]

positional arguments:
  packages               The packages to keep, eg 'weka'.

optional arguments:
  -h, --help             show this help message and exit
  --java-home JAVAHOME   The java home directory  of  the JDK that includes
                         the jdeps binary, default  is taken from JAVA_HOME
                         environment variable.
  --class-path CLASSPATH
                         The CLASSPATH to use for jdeps.
  --classes CLASSES      The file containing the  classes  to determine the
                         dependencies for. Empty  lines  and lines starting
                         with # get ignored.
  --additional ADDITIONAL
                         The file  with  additional  class  names  to  just
                         include.
  --output OUTPUT        The file for  storing  the  determined class names
                         in.

Example

Use case: determine a minimal subset of classes for an embedded version of Weka.

The following Weka classes are required (./classes.txt):

weka.classifiers.Evaluation
weka.classifiers.functions.Logistic
weka.classifiers.functions.MultilayerPerceptron
weka.core.Attribute
weka.core.DenseInstance
weka.core.Instances
weka.core.SerializationHelper
weka.filters.Filter
weka.filters.unsupervised.attribute.Discretize
weka.filters.supervised.instance.Resample

The JDK is located at /some/where/jdk1.8.0_144-64bit and the Weka jar at ./weka.jar. We are looking for Weka packages, hence using weka as positional argument.

This gives the following commandline, which will output the determined classes on stdout:

com.github.fracpete.deps4j.MinDeps \
  --java-home
  /some/where/jdk1.8.0_144-64bit
  --classes
  ./classes.txt
  --class-path
  ./weka.jar
  weka

Maven

Add the following dependency to your pom.xml:

    <dependency>
      <groupId>com.github.fracpete</groupId>
      <artifactId>deps4j</artifactId>
      <version>0.0.2</version>
    </dependency>