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Build Identifier: aspectjrt-1.6.12 when i try to read the MANIFEST.MF from the aspectjrt-1.6.12.jar file i got a null as Manifest. I tested many different jars, also own created jars and only with this jar the problem exists. I discovered this, while playing around with OneJar that tries to load the MANIFEST.MF of all included libraries. Reproducible: Always Steps to Reproduce: sample code: import java.io.FileInputStream; import java.io.IOException; import java.util.jar.JarInputStream; public class test { public static void main(String[] args) throws IOException { final FileInputStream fileInputStream = new FileInputStream("S:\\aspectjrt-1.6.12.jar"); System.err.println(new JarInputStream(fileInputStream).getManifest()); } }