A new JPMS-friendly Java program packaging format

[Nathan Reynolds]

Please provide a way to exclude files or packages from a particular Jar.
For example, I may not want Multimap.class in the Guava Jar.

Is this compatible with Proguard's and Graal VM's to trim fat Jars?  Both
of these will eliminate unused classes, methods, and fields to reduce the
size of the fat Jar.

On Wed, Dec 6, 2023 at 3:17 PM Glavo <zjx001202 at gmail.com> wrote:

> Hey everyone,
>
> Recently, I have been busy developing a new JPMS-friendly Java program
> packaging format: JApp (https://github.com/Glavo/japp).
>
> JApp is intended as a better alternative to shadow jar (fat jar).
> Users need to specify the module path and classpath when creating a JApp
> file.
> Resources in all module path/classpath entries (JAR or directory) are
> packaged into a single japp file,
> but unlike shadow jars, japp isolates resources from different module
> path/classpath entries.
>
> For example, we can create a japp file with the following command:
>
>     japp create -o myapp.japp \
> --module-path commons-lang3-3.14.0.jar:commons-io-2.15.1.jar \
>         --classpath guava-32.1.3-jre.jar:gson-2.10.1.jar
>
>
> This will create a japp file named `myjapp.japp` that contains resources
> from four jar files.
> At runtime, the URIs for the resources from the four JAR files each look
> like this:
>
>
> japp:/modules/org.apache.commons.lang3/org/apache/commons/lang3/ObjectUtils.class
> japp:/modules/org.apache.commons.io/org/apache/commons/io/IOUtils.class
>
> japp:/classpath/guava-32.1.3-jre.jar/com/google/common/collect/Multimap.class
> japp:/classpath/gson-2.10.1.jar/com/google/gson/Gson.class
> At runtime, each entry in the module path and classpath is independent,
> just like passing the `--classpath`/`--module-path` option directly to the
> `java` command.
>
> By sharing the class constant pool, using zstd as the compression method,
> and
> compressing the file metadata, japp files are generally smaller than
> shadow jars.
>
> JApp files also support specifying some conditions, such as requirements
> for the Java version.
> JApp selects the Java runtime to use to run the program based on these
> conditions.
>
> Here is its GitHub repository, for more features and detailed instructions
> please refer to the README:
>
>     https://github.com/Glavo/japp
>
> Now that the basic features of JApp are complete, I'm sharing it here in
> the hope
> that more people will try it and give feedback.
>
> Thank you to everyone who is willing to read this email!
>
> Glavo
>
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