Explicitly set Java language level to 1.8 + using diamonds

pom.xml

@@ -17,6 +17,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
   </properties>
   
   <repositories>

src/main/java/net/socialgamer/cah/customsets/CustomCardFormatHelper.java

@@ -37,7 +37,7 @@ public final class CustomCardFormatHelper {
 
   public static String formatBlackCard(final JSONArray textParts) {
     // TODO this is going to need some work to look pretty.
-    final List<String> strs = new ArrayList<String>(textParts.size());
+    final List<String> strs = new ArrayList<>(textParts.size());
     for (final Object o : textParts) {
       strs.add((String) o);
     }
@@ -47,7 +47,7 @@ public final class CustomCardFormatHelper {
 
   public static String formatWhiteCard(final JSONArray textParts) {
     // The white cards should only ever have one element in text, but let's be safe.
-    final List<String> strs = new ArrayList<String>(textParts.size());
+    final List<String> strs = new ArrayList<>(textParts.size());
     for (final Object o : textParts) {
       final String cardCastString = (String) o;
       if (cardCastString.isEmpty()) {

src/main/java/net/socialgamer/cah/customsets/CustomCardsService.java

@@ -249,7 +249,7 @@ public class CustomCardsService {
 
   private void putCache(CustomDeck deck, long timeout, String url, String hash) {
     synchronized (cache) {
-      cache.add(new SoftReference<CacheEntry>(new CacheEntry(timeout + System.currentTimeMillis(), deck, url, hash)));
+      cache.add(new SoftReference<>(new CacheEntry(timeout + System.currentTimeMillis(), deck, url, hash)));
     }
   }
 
@@ -295,16 +295,13 @@ public class CustomCardsService {
       return null;
     }
 
-    final InputStream is = conn.getInputStream();
-    try {
+    try (InputStream is = conn.getInputStream()) {
       return new ByteSource() {
         @Override
         public InputStream openStream() {
           return is;
         }
       }.asCharSource(Charsets.UTF_8).read();
-    } finally {
-      is.close();
     }
   }
 

src/main/java/net/socialgamer/cah/customsets/CustomDeck.java

@@ -33,8 +33,8 @@ public class CustomDeck extends CardSet {
   private final int id;
   private final String name;
   private final String description;
-  private final Set<CustomBlackCard> blackCards = new HashSet<CustomBlackCard>();
-  private final Set<CustomWhiteCard> whiteCards = new HashSet<CustomWhiteCard>();
+  private final Set<CustomBlackCard> blackCards = new HashSet<>();
+  private final Set<CustomWhiteCard> whiteCards = new HashSet<>();
 
   public CustomDeck(final int id, final String name, final String description) {
     this.id = id;

src/main/java/net/socialgamer/cah/handlers/AddCardsetHandler.java

@@ -30,7 +30,7 @@ public class AddCardsetHandler extends GameWithPlayerHandler {
   @Override
   public Map<ReturnableData, Object> handleWithUserInGame(final RequestWrapper request,
                                                           final HttpSession session, final User user, final Game game) {
-    final Map<ReturnableData, Object> data = new HashMap<ReturnableData, Object>();
+    final Map<ReturnableData, Object> data = new HashMap<>();
 
     if (game.getHost() != user) {
       return error(ErrorCode.NOT_GAME_HOST);

src/main/java/net/socialgamer/cah/handlers/ListCardsetsHandler.java

@@ -31,7 +31,7 @@ public class ListCardsetsHandler extends GameWithPlayerHandler {
   @Override
   public Map<ReturnableData, Object> handleWithUserInGame(final RequestWrapper request,
                                                           final HttpSession session, final User user, final Game game) {
-    final Map<ReturnableData, Object> data = new HashMap<ReturnableData, Object>();
+    final Map<ReturnableData, Object> data = new HashMap<>();
 
     final List<Map<CardSetData, Object>> setDatas = new ArrayList<>();
     for (final Integer deckId : game.getCustomDeckIds().toArray(new Integer[0])) {

src/main/java/net/socialgamer/cah/handlers/RemoveCardsetHandler.java

@@ -30,7 +30,7 @@ public class RemoveCardsetHandler extends GameWithPlayerHandler {
   @Override
   public Map<ReturnableData, Object> handleWithUserInGame(final RequestWrapper request,
                                                           final HttpSession session, final User user, final Game game) {
-    final Map<ReturnableData, Object> data = new HashMap<ReturnableData, Object>();
+    final Map<ReturnableData, Object> data = new HashMap<>();
 
     if (game.getHost() != user) {
       return error(ErrorCode.NOT_GAME_HOST);