Java%20Beans%20Interview%20Questions%20and%20Answers

Question: Why do I get a NullPointerException when loading a JAR file into the BeanBox?

Answer: Usually this is because of a mistake in the JAR file being loaded. In the meantime, typical errors include:

► The MANIFEST file uses classes using the wrong file separator ("/" should be used in all platforms).
► The MANIFEST file refers to classes in a package but the actual .class files are not really in that package.