How to get name of main class of a jar file from Java?

Question

I want to load and execute external jar file using URLClassLoader. What is the easiest way to get "Main-Class" from it? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

I know this is an old question but, at least with the JDK 1.7, the previously proposed solutions did not seem to work. For this reason I am posting mine: JarFile j = new JarFile(new File("jarfile.jar")); String mainClassName = j.getManifest().getMainAttributes().getValue("Main-Class"); The reason why the other solutions did not work for me was because j.getManifest().getEntries() turns out to not contain the Main-Class attribute, that was instead contained in the list returned by the getMainAttributes() method.