I've put the jar files in a new folder, added that folder to the PATH and CLASSPATH, and added that to the build path as an external library. I've added a user defined library in Eclipse ...

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.

If this were a static c library, or a cocoa framework I'd know what to do! But I don't know how to package a 3rd party jar library along with my own jar.

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.