Can Java Classpaths Include Nested JAR Files?

Can JARs Be Nested in Java Classpaths?

Question:

Is it possible to define a Java classpath that incorporates a JAR file residing within another JAR file?

Answer:

Yes, there are multiple approaches to creating a single JAR containing your application and necessary libraries:

1. One-Jar:

One-Jar utilizes a custom classloader that enables JAR nesting. This tool creates a "wrapper" JAR that contains the primary JAR and its dependencies.

2. UberJar (or Shade):

UberJar and Shade are Maven plugins that "unpack" included libraries, placing all classes in the top-level JAR. These plugins make it easier to distribute and deploy self-contained JARs.

Additional Options:

• Assembly Plugin:
  This Maven plugin offers a more versatile solution but requires careful configuration to achieve the desired result.

  • Note: Please avoid using the classloaders in libraries containing one another. This practice can lead to conflicts and unexpected behavior.

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