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According to this question, it is possible to load a class from a jar file with:
ClassLoader loader = URLClassLoader.newInstance(
new URL[] { jarFileURL },
getClass().getClassLoader()
);
Class<?> clazz = Class.forName("mypackage.MyClass", true, loader);
How to load all classes contained in a jar file?
The class loader will load a .class file as soon as it’s needed. If it’s not needed, it won’t be loaded.
Why do you think that your approach will be an improvement over what the class loader already does?