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Chefling is a very minimal dependency injection container written in pure Java.

There is a newer version: 7.1.1

package com.cookingfox.chefling.impl;

import com.cookingfox.chefling.api.CheflingBuilder;
import com.cookingfox.chefling.api.CheflingConfig;
import com.cookingfox.chefling.api.CheflingContainer;
import com.cookingfox.chefling.api.exception.ContainerBuilderException;
import com.cookingfox.chefling.impl.command.CommandContainer;

import java.util.LinkedList;
import java.util.Objects;

/**
 * Helper class for managing Chefling containers.
 */
public final class Chefling {

    private Chefling() {
        // should not be instantiated
    }

    /**
     * Creates a new Chefling Builder.
     */
    public static CheflingBuilder builder() {
        return new Builder();
    }

    /**
     * Creates a new instance of the default Chefling {@link CheflingContainer} implementation.
     */
    public static CheflingContainer createContainer() {
        return new CommandContainer();
    }

    /**
     * Chefling Builder implementation.
     */
    public static class Builder implements CheflingBuilder {

        /**
         * List of added configurations.
         */
        protected final LinkedList configs = new LinkedList<>();

        @Override
        public CheflingBuilder addConfig(CheflingConfig config) {
            Objects.requireNonNull(config, "Config can not be null");

            if (configs.contains(config)) {
                throw new ContainerBuilderException("Config was already added");
            }

            configs.add(config);

            return this;
        }

        @Override
        public CheflingContainer buildContainer() {
            if (configs.isEmpty()) {
                throw new ContainerBuilderException("Add configs first");
            }

            CheflingContainer container = createContainer();

            for (CheflingConfig config : configs) {
                try {
                    config.apply(container);
                } catch (Exception e) {
                    throw new ContainerBuilderException("An error occurred during build container", e);
                }
            }

            return container;
        }

    }

}