Use Java 7 Language Level

src/com/dre/brewery/filedata/ConfigUpdater.java

@@ -13,7 +13,7 @@ import com.dre.brewery.P;
 
 public class ConfigUpdater {
 
-	private ArrayList<String> config = new ArrayList<String>();
+	private ArrayList<String> config = new ArrayList<>();
 	private File file;
 
 	public ConfigUpdater(File file) {

src/com/dre/brewery/filedata/DataSave.java

@@ -54,7 +54,7 @@ public class DataSave extends BukkitRunnable {
 		}
 		try {
 			cancel();
-		} catch (IllegalStateException e) {
+		} catch (IllegalStateException ignored) {
 		}
 
 		FileConfiguration configFile = new YamlConfiguration();

src/com/dre/brewery/filedata/DataUpdater.java

@@ -51,7 +51,7 @@ public class DataUpdater {
 					ConfigurationSection matSection = section.getConfigurationSection(id + ".mats");
 					if (matSection != null) {
 						// matSection has all the materials + amount as Integers
-						Map<String, Integer> ingredients = new HashMap<String, Integer>();
+						Map<String, Integer> ingredients = new HashMap<>();
 						for (String ingredient : matSection.getKeys(false)) {
 							// convert to Material
 							Material mat = Material.getMaterial(P.p.parseInt(ingredient));
@@ -81,7 +81,7 @@ public class DataUpdater {
 							ConfigurationSection ingredientSection = cauldrons.getConfigurationSection(id + ".ingredients");
 							if (ingredientSection != null) {
 								// has all the materials + amount as Integers
-								Map<String, Integer> ingredients = new HashMap<String, Integer>();
+								Map<String, Integer> ingredients = new HashMap<>();
 								for (String ingredient : ingredientSection.getKeys(false)) {
 									// convert to Material
 									Material mat = Material.getMaterial(P.p.parseInt(ingredient));

src/com/dre/brewery/filedata/LanguageReader.java

@@ -10,8 +10,8 @@ import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.configuration.file.YamlConfiguration;
 
 public class LanguageReader {
-	private Map<String, String> entries = new TreeMap<String, String>();
-	private Map<String, String> defaults = new TreeMap<String, String>();
+	private Map<String, String> entries = new TreeMap<>();
+	private Map<String, String> defaults = new TreeMap<>();
 
 	private File file;
 	private boolean changed;
@@ -143,6 +143,7 @@ public class LanguageReader {
 		}
 	}
 
+	@SuppressWarnings("ResultOfMethodCallIgnored")
 	public void save() {
 		if (changed) {
 			/* Copy old File */

src/com/dre/brewery/filedata/ReadOldData.java

@@ -14,6 +14,7 @@ public class ReadOldData extends BukkitRunnable {
 	public FileConfiguration data;
 	public boolean done = false;
 
+	@SuppressWarnings("ResultOfMethodCallIgnored")
 	@Override
 	public void run() {
 		File datafile = new File(P.p.getDataFolder(), "data.yml");