One-JAR(TM) is a simple solution to a vexing problem in Java: how to distribute an application as a single jar-file, when it depends on multiple other jar-files. One-JAR uses a custom classloader to discover library jar files inside the main jar.
Crystal Installer is a free, handy Java program (based on InstallGuru) made to help you deploy your software. It creates an executable jar file. This installer can run on any operating system with a Java Runtime Environment (JRE).
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...It will sanity check all of the items in a classpath, reporting as many errors as possible. It can also be useful for listing the classes in a classpath, including what is in a jar.