Can I Nest JAR Files within a Java Classpath?
Published on 2025-01-20
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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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