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Runtime Package

The org.apache.juneau.commons.runtime package provides lean accessors for two common runtime inputs: command-line arguments and JAR manifest files.

Command-Line Arguments​

Args​

A lean parser for command-line arguments passed to a main(String[]) method. It supports positional arguments, -key value, --key, --key=value, and -Dkey=value grammars (all enabled by default), returning values via an Optional-based API.

public static void main(String[] argv) {
    Args args = new Args(argv);
    Optional<String> config = args.get("config");   // --config value
    List<String> files = args.positional();          // bare arguments
}

Grammar options can be toggled via Args.Builder obtained from Args.create().

Manifest Files​

ManifestFile​

A lean accessor for the contents of a JAR manifest. Wraps a java.util.jar.Manifest and exposes main-attribute and per-section entries via an Optional-returning API — constructable from a Class, File, Path, InputStream, Reader, or Manifest.

ManifestFile mf = new ManifestFile(MyClass.class);
Optional<String> version = mf.get("Implementation-Version");

See also​