Add more information on failed database connection attempts

Minepacks/pom.xml

@@ -36,7 +36,7 @@
 		<dependency>
 			<groupId>at.pcgamingfreaks</groupId>
 			<artifactId>PluginLib</artifactId>
-			<version>1.0.22-SNAPSHOT</version>
+			<version>1.0.23-SNAPSHOT</version>
 		</dependency>
 		<!-- BadRabbit -->
 		<dependency>

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Database.java

@@ -84,7 +84,9 @@ public void close()
 		unCacheStrategie.close();
 	}
 
-	public static Database getDatabase(Minepacks plugin)
+	public static @Nullable Database getDatabase(Minepacks plugin)
+	{
+		try
 		{
 			String dbType = plugin.getConfiguration().getDatabaseType().toLowerCase(Locale.ROOT);
 			ConnectionProvider connectionProvider = null;
@@ -118,6 +120,13 @@ public static Database getDatabase(Minepacks plugin)
 			database.init();
 			return database;
 		}
+		catch(IllegalStateException ignored) {}
+		catch(Exception e)
+		{
+			e.printStackTrace();
+		}
+		return null;
+	}
 
 	public void backup(@NotNull Backpack backpack)
 	{

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQL.java

@@ -37,7 +37,7 @@
 
 public abstract class SQL extends Database
 {
-	private ConnectionProvider dataSource;
+	private final ConnectionProvider dataSource;
 
 	protected String tablePlayers, tableBackpacks, tableCooldowns; // Table Names
 	protected String fieldPlayerName, fieldPlayerID, fieldPlayerUUID, fieldBpOwner, fieldBpIts, fieldBpVersion, fieldBpLastUpdate, fieldCdPlayer, fieldCdTime; // Table Fields
@@ -50,6 +50,7 @@ public SQL(@NotNull Minepacks plugin, @NotNull ConnectionProvider connectionProv
 		super(plugin);
 
 		dataSource = connectionProvider;
+		if(!dataSource.isAvailable()) throw new IllegalStateException("Failed to initialize database connection!");
 
 		loadSettings();
 		buildQuerys();

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Minepacks.java

@@ -33,6 +33,7 @@
 import at.pcgamingfreaks.Minepacks.Bukkit.Database.Helper.WorldBlacklistMode;
 import at.pcgamingfreaks.Minepacks.Bukkit.Database.Language;
 import at.pcgamingfreaks.Minepacks.Bukkit.Listener.*;
+import at.pcgamingfreaks.Minepacks.Bukkit.SpecialInfoWorker.NoDatabaseWorker;
 import at.pcgamingfreaks.StringUtils;
 import at.pcgamingfreaks.Updater.UpdateProviders.BukkitUpdateProvider;
 import at.pcgamingfreaks.Updater.UpdateProviders.JenkinsUpdateProvider;
@@ -177,6 +178,11 @@ private void load()
 	{
 		lang.load(config);
 		database = Database.getDatabase(this);
+		if(database == null)
+		{
+			new NoDatabaseWorker(this);
+			return;
+		}
 		maxSize = config.getBackpackMaxSize();
 		at.pcgamingfreaks.Minepacks.Bukkit.Backpack.setShrinkApproach(config.getShrinkApproach());
 		at.pcgamingfreaks.Minepacks.Bukkit.Backpack.setTitle(config.getBPTitle(), config.getBPTitleOther());

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/SpecialInfoWorker/NoDatabaseWorker.java

@@ -0,0 +1,94 @@
+/*
+ *   Copyright (C) 2020 GeorgH93
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package at.pcgamingfreaks.Minepacks.Bukkit.SpecialInfoWorker;
+
+import at.pcgamingfreaks.Bukkit.Message.Message;
+import at.pcgamingfreaks.Bukkit.Message.MessageBuilder;
+import at.pcgamingfreaks.Bukkit.RegisterablePluginCommand;
+import at.pcgamingfreaks.Message.MessageColor;
+import at.pcgamingfreaks.Minepacks.Bukkit.Minepacks;
+import at.pcgamingfreaks.Minepacks.Bukkit.Permissions;
+import at.pcgamingfreaks.Reflection;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * This worker will inform the admin that the plugin failed to connect to the database, he hopefully is able to solve the problem.
+ * It registers a new command that only allows to reload the plugin to prevent unnecessary downtime for the server cause of restarts.
+ */
+public class NoDatabaseWorker extends SpecialInfoBase implements CommandExecutor
+{
+	private final Minepacks plugin;
+	private final RegisterablePluginCommand command;
+	private final Message messageDBProblem;
+
+	public NoDatabaseWorker(final @NotNull Minepacks plugin)
+	{
+		super(plugin, Permissions.RELOAD);
+		this.plugin = plugin;
+		Bukkit.getPluginManager().registerEvents(this, plugin);
+		command = new RegisterablePluginCommand(plugin, "backpack");
+		command.registerCommand();
+		command.setExecutor(this);
+		messageDBProblem = new MessageBuilder("Minepacks", MessageColor.GOLD).append(" failed to connect to its database!", MessageColor.RED).appendNewLine()
+				.append("Please check your configuration and reload the plugin (", MessageColor.RED).append("/backpack reload", MessageColor.BLUE).command("/backpack reload").append(")!", MessageColor.RED).getMessage();
+	}
+
+	@Override
+	protected void sendMessage(Player player)
+	{
+		messageDBProblem.send(player);
+	}
+
+	@Override
+	public boolean onCommand(@NotNull CommandSender commandSender, @NotNull Command cmd, @NotNull String s, String[] strings)
+	{
+		if(strings.length != 1 || !strings[0].equalsIgnoreCase("reload"))
+		{
+			commandSender.sendMessage(MessageColor.RED + "Only \"/backpack reload\" is available at the moment!");
+		}
+		else
+		{
+			if(commandSender.hasPermission(Permissions.RELOAD))
+			{
+				command.unregisterCommand();
+				HandlerList.unregisterAll(this);
+				try
+				{
+					plugin.getConfiguration().reload();
+					Reflection.getMethod(plugin.getClass(), "load").invoke(plugin);
+				}
+				catch(Exception e)
+				{
+					e.printStackTrace();
+				}
+			}
+			else
+			{
+				commandSender.sendMessage(MessageColor.RED + "You don't have the permission to do that!");
+			}
+		}
+		return true;
+	}
+}

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/SpecialInfoWorker/SpecialInfoBase.java

@@ -0,0 +1,53 @@
+/*
+ *   Copyright (C) 2020 GeorgH93
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package at.pcgamingfreaks.Minepacks.Bukkit.SpecialInfoWorker;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public abstract class SpecialInfoBase implements Listener
+{
+	private final JavaPlugin plugin;
+	private final String permission;
+
+	protected SpecialInfoBase(final JavaPlugin plugin, final String permission)
+	{
+		this.plugin = plugin;
+		this.permission = permission;
+	}
+
+	@EventHandler
+	public void onJoin(final PlayerJoinEvent event)
+	{
+		if(event.getPlayer().hasPermission(permission))
+		{
+			Bukkit.getScheduler().runTaskLater(plugin, () -> {
+				if(event.getPlayer().isOnline())
+				{
+					sendMessage(event.getPlayer());
+				}
+			}, 3 * 20L); // Run with a 3 seconds delay
+		}
+	}
+
+	protected abstract void sendMessage(final Player player);
+}

pom.xml

@@ -7,7 +7,7 @@
 	<packaging>pom</packaging>
 
 	<properties>
-		<revision>2.3.5</revision>
+		<revision>2.3.6-RC1</revision>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 	</properties>