Learn how to do essential CRUD operations on JAR, WAR, and EAR files using the command line and jar command.

What's the difference between EAR, JAR and WAR files? They are three common formats for Java application deployment, but they each target different environments with different characteristics.

Newer versions of Java now require all JAR files to be signed with a valid code-signing key, and starting with Java 7 Update 51, unsigned or self-signed applications are blocked from running.