/*
 * LapisCommons
 * Copyright (c) 2014, LapisDev <https://github.com/LapisDev>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package blue.lapis.common;

import org.apache.logging.log4j.Logger;
import org.spongepowered.api.Game;
import org.spongepowered.api.event.SpongeEventHandler;
import org.spongepowered.api.event.state.PreInitializationEvent;
import org.spongepowered.api.plugin.Plugin;

import javax.annotation.Nullable;

/**
 * Plugin class. This is not super-important in itself, but needs to be here so we can guarantee that it's
 * available for declared dependencies and gets onto the ClassLoader to be used.
 */
@Plugin(id = "lapis-commons", name = "LapisCommons", version = "1.0.0-SNAPSHOT")
public class LapisCommonsPlugin {
    private static LapisCommonsPlugin instance;
    private static Logger logger;
    private static Game game;

    /**
     * Gets the instance of the LapisCommons plugin.
     *
     * @return The currently loaded plugin instance or null if the plugin is not loaded.
     */
    @Nullable
    public static LapisCommonsPlugin getInstance() {
        return instance;
    }

    /**
     * Gets the instance the {@link Game} instance of the current server implementation.
     *
     * @return The game instance of the server implementation or null if the plugin is not loaded.
     */
    @Nullable
    public static Game getGame() {
        return game;
    }

    /**
     * Gets the plugin logger of the LapisCommons plugin.
     *
     * @return The plugin logger for this plugin or null if the plugin is not loaded
     */
    @Nullable
    public static Logger getLogger() {
        return logger;
    }

    @SpongeEventHandler
    public void initialize(PreInitializationEvent event) {
        instance = this;
        game = event.getGame();
        logger = event.getPluginLog();
    }
}

/*
 * LapisCommons
 * Copyright (c) 2014, LapisDev <https://github.com/LapisDev>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package blue.lapis.common;

import org.apache.logging.log4j.Logger;
import org.spongepowered.api.Game;
import org.spongepowered.api.event.SpongeEventHandler;
import org.spongepowered.api.event.state.PreInitializationEvent;
import org.spongepowered.api.plugin.Plugin;

import javax.annotation.Nullable;

/**
 * Plugin class. This is not super-important in itself, but needs to be here so we can guarantee that it's
 * available for declared dependencies and gets onto the ClassLoader to be used.
 */
@Plugin(id = "lapis-commons", name = "LapisCommons", version = "1.0.0-SNAPSHOT")
public class LapisCommonsPlugin {
    private static LapisCommonsPlugin instance;
    private static Logger logger;
    private static Game game;

    /**
     * Gets the instance of the LapisCommons plugin.
     *
     * @return The currently loaded plugin instance or null if the plugin is not loaded.
     */
    public static LapisCommonsPlugin getInstance() {
        return instance;
    }

    /**
     * Gets the instance the {@link Game} instance of the current server implementation.
     *
     * @return The game instance of the server implementation or null if the plugin is not loaded.
     */
    public static Game getGame() {
        return game;
    }

    /**
     * Gets the plugin logger of the LapisCommons plugin.
     *
     * @return The plugin logger for this plugin or null if the plugin is not loaded
     */
    public static Logger getLogger() {
        return logger;
    }

    @SpongeEventHandler
    public void initialize(PreInitializationEvent event) {
        instance = this;
        game = event.getGame();
        logger = event.getPluginLog();
    }
}

Remove Nullable from the plugin class to prevent warnings.