Can values defined in MANIFEST.MF be accessed programmatically?

Many of the values in the MANIFEST.MF can be accessed programmatically without having to find and/or open the jar file itself.

The class java.lang.Package provides access to the ImplementationTitle, ImplementationVendor, ImplementationVersion, SpecificationTitle, SpecificationVendor and the SpecificationVersion.

Information about signed classes can be found using the CodeSource class, which can be retrieved via Class.getProtectionDomain().getCodeSource()

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