You can read the entries from a JAR file using Java API.
To read the entries from a manifest file, get the object of Manifest class using getManifest() class of the JarInputStream
import java.io.FileInputStream; import java.util.Map; import java.util.jar.Attributes; import java.util.jar.JarInputStream; import java.util.jar.Manifest; public class Main { public static void main(String[] args) throws Exception { // Create a JAR input stream object JarInputStream jis = new JarInputStream(new FileInputStream("jartest.jar")); // Get the manifest file from the JAR file. Will return null if // there is no manifest file in the JAR file. Manifest manifest = jis.getManifest(); if (manifest != null) { // Get the attributes from main section Attributes mainAttributes = manifest.getMainAttributes(); String mainClass = mainAttributes.getValue("Main-Class"); // Get the attributes from individual section Map<String, Attributes> entries = manifest.getEntries(); } } }