jdependency

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Provides an API to analyse and modify class dependencies. It provides the core to the maven shade plugin for removing unused classes.

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- - ci.yml
  - release-docs.yml
  - release-to-maven-central.yml
.gitignore
CHANGELOG.md
docker.sh
LICENSE.txt
pom.xml
README.md
RELEASE.md
renovate.json

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# jdependency - explore your classpath

jdependency is small library that helps you analyze class level dependencies,
clashes and missing classes.

Check the documentation on how to use it with [javadocs](https://tcurdt.github.io/jdependency/apidocs/) and a source
[xref](http://tcurdt.github.io/jdependency/xref/) is also available.

## Where to get it

The jars are available on [maven central](https://repo1.maven.org/maven2/org/vafer/jdependency/).
The source releases you can get in the [release section](https://github.com/tcurdt/jdependency/releases).

If feel adventures or want to help out feel free to get the latest code
[via git](https://github.com/tcurdt/jdependency/tree/master).

```sh
git clone git://github.com/tcurdt/jdependency.git
```

## How to use it

```java
final File jar1 = ...
final File jar2 = ...
```

or

```java
final Path jar1 = ...
final Path jar2 = ...
```

### finding classpath clashes

```java
final Clazzpath cp = new Clazzpath();
cp.addClazzpathUnit(jar1, "jar1.jar");
cp.addClazzpathUnit(jar2, "jar2.jar");

final Set<Clazz> clashed = cp.getClashedClazzes();
for(Clazz clazz : clashed) {
  System.out.println("class " + clazz + " is contained in " + clazz.getClasspathUnits());
}
```

### finding different class versions

```java
final Clazzpath cp = new Clazzpath(true);
cp.addClazzpathUnit(jar1, "jar1.jar");
cp.addClazzpathUnit(jar2, "jar2.jar");

final Set<Clazz> clashed = cp.getClashedClazzes();

final Set<Clazz> uniq = clashed.stream()
  .filter(c -> c.getVersions().size() == 1)
  .collect(Collectors.toSet());

clashed.removeAll(uniq);

for(Clazz clazz : clashed) {
  System.out.println("class " + clazz + " differs accross " + clazz.getClasspathUnits());
}
```

### finding missing classes

```java
final Clazzpath cp = new Clazzpath();
cp.addClazzpathUnit(jar1, "jar1.jar");

final Set<Clazz> missing = cp.getMissingClazzes();
for(Clazz clazz : missing) {
  System.out.println("class " + clazz + " is missing");
}
```

### finding unused classes

```java
final Clazzpath cp = new Clazzpath();
final ClazzpathUnit artifact = cp.addClazzpathUnit(jar1, "artifact.jar");
cp.addClazzpathUnit(jar2, "dependency.jar");

final Set<Clazz> removable = cp.getClazzes();
removable.removeAll(artifact.getClazzes());
removable.removeAll(artifact.getTransitiveDependencies());

for(Clazz clazz : removable) {
  System.out.println("class " + clazz + " is not required");
}
```

## Related projects

provides a report of the dependencies used/unused and provides a debloated version of the pom.xml

| Project                                                                    | Description                                                                                       |
| -------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| [maven-shade-plugin](https://maven.apache.org/plugins/maven-shade-plugin/) | allows to inline and optimize dependencies into a single jar                                      |
| [gradle-lean](https://github.com/cuzfrog/gradle-lean)                      | gradle version of the maven-shade plugin (stale)                                                  |
| [shadow](https://github.com/GradleUp/shadow)                               | gradle version of the maven-shade plugin                                                          |
| [jarjar](http://code.google.com/p/jarjar/)                                 | allows to inline and optimize dependencies into a single jar (stale)                              |
| [proguard](https://github.com/Guardsquare/proguard)                        | obfuscator, shrinker (GPL)                                                                        |
| [DepClean](https://github.com/castor-software/depclean)                    | provides a report of the dependencies used/unused and provides a debloated version of the pom.xml |

## License

All code and data is released under the Apache License 2.0.

jdependency

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