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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;

import org.jetbrains.annotations.Nullable;

import static io.datakernel.di.util.Utils.getScopeDisplayString;

/**
 * A runtime exception that is thrown on startup when some of the static conditions fail
 * (missing or cyclic dependencies, incorrect annotations etc.) or in runtime when
 * you ask an {@link Injector} for an instance it does not have a {@link Binding binding} for.
 */
public final class DIException extends RuntimeException {
	public static DIException cannotConstruct(Key key, @Nullable BindingInfo info) {
		return new DIException((info != null ? "Binding refused to" : "No binding to") + " construct an instance for key " +
				key.getDisplayString() + (info != null && info.getLocation() != null ? ("\n\t at" + info.getLocation()) : ""));
	}

	public static DIException noCachedBinding(Key key, Scope[] scope) {
		throw new DIException("No cached binding was bound for key " + key.getDisplayString() + " in scope " + getScopeDisplayString(scope) + ". " +
				"Either bind it or check if a binding for such key exists with hasBinding() call.");
	}

	public DIException(String message) {
		super(message);
	}

	public DIException(String message, Throwable cause) {
		super(message, cause);
	}
}