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DataKernel has an extremely lightweight DI with ground-breaking design principles. It supports nested scopes, singletons, object factories, modules and plugins which allow to transform graph of dependencies at startup time without any reflection.

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package io.datakernel.di.core;

/**
 * This is a function which can inject instances into {@link io.datakernel.di.annotation.Inject}
 * fields and methods of some already existing object.
 * This is so-called 'post-injections' since such injections are not part of object creation.
 * 
 * It has a {@link io.datakernel.di.module.DefaultModule default generator} and
 * can only be obtained by depending on it and then requesting it from the {@link Injector injector}.
 */
public interface InstanceInjector {
	Key key();

	void injectInto(T existingInstance);
}