Improve JDK tools

[sormuras]

• java -jar MJAR "module-style" using s/t like java --module-path MJAR --module- NAME
• javac --module "up-to-date check for deleted" classes
• jdeps -Werror --module-path --check MODULE
• jar --check --file "sanity, .class versions"
• jar --reproducible https://vishia.org
• jarsigner sign and validate via https://sigstore.dev

[sormuras]

jar --validate --file ... is included in Java 17 via openjdk/jdk#3971

The validation could/should be extended with:

• all targeted classes should target the same (or at least: lower) bytecode level: META-INF/versions/9 must not contain .class files targetting Java 10 or higher. See also Detect broken MR-JAR files sandermak/modulescanner#14
• MANIFEST.MF as first JAR entry: junit-platform-commons 1.7.0 does not contain MANIFEST.MF as first JAR entry junit-team/junit5#2438 (if present in the root directory, module-info.class must be next, iirc)

[sormuras]

Make all tools support -version and --version and unify output to either include tool's name or not.

    ToolFinder.ofSystem().findAll().stream()
        .sorted(Comparator.comparing(ToolProvider::name))
        .forEach(tool -> bach.run(tool, tool.name().equals("javap") ? "-version" : "--version"));

yields

             jar --version
jar 17
           javac --version
javac 17
         javadoc --version
javadoc 17
           javap -version
17
           jdeps --version
17
           jlink --version
17
            jmod --version
17
        jpackage --version
17

[sormuras]

Let jar --create path/to/file.jar create missing parent directories, here for example: path/to.

[sormuras]

• jar --describe-module --file [email protected]

[email protected] jar:file:///.../[email protected]!/module-info.class
exports simple
requires java.base mandated
contains simple.internal
main-class simple.Main

• java --module-path . --describe-module simple

[email protected] file:///.../[email protected]
exports simple
requires java.base mandated
contains simple.internal

The main-class line is missing when using the Java launcher.

[sormuras]

Why don't some tools implement ToolProvider, for example: jfr?