Can I Nest JAR Files within a Java Classpath?

Packaging Jars within Jars

The question arises whether one can configure a Java classpath to incorporate a JAR file nestled within another.

Nesting Jars:

If your aim is to create a single JAR containing both your application and its dependencies, there are two plausible approaches:

• One-Jar: This employs a custom classloader to permit nested JARs.
• UberJar/Shade: Explodes the bundled libraries and places all classes within the primary JAR.

These methods entail creating a single deployable unit, easing distribution and deployment.

Alternative Solutions:

Additionally, consider the following options:

• Assembly Plugin: While more intricate to configure, this Maven plugin provides greater flexibility.
• Classpath Manipulation: Optionally, you can manually tweak the classpath to locate nested JARs via the -cp (or equivalent) JVM parameter.

Ultimately, the optimal solution depends on your specific requirements and preferences.

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