Use diamond operator.

Author: greenrobot-team

objectbox-java/src/main/java/io/objectbox/BoxStore.java

@@ -170,7 +170,7 @@ public static boolean isObjectBrowserAvailable() {
     private final LongHashMap<Class> classByEntityTypeId = new LongHashMap<>();
     private final int[] allEntityTypeIds;
     private final Map<Class, Box> boxes = new ConcurrentHashMap<>();
-    private final Set<Transaction> transactions = Collections.newSetFromMap(new WeakHashMap<Transaction, Boolean>());
+    private final Set<Transaction> transactions = Collections.newSetFromMap(new WeakHashMap<>());
     private final ExecutorService threadPool = new ObjectBoxThreadPool(this);
     private final ObjectClassPublisher objectClassPublisher;
     final boolean debugTxRead;

objectbox-java/src/main/java/io/objectbox/internal/ObjectBoxThreadPool.java

@@ -40,7 +40,7 @@ public class ObjectBoxThreadPool extends ThreadPoolExecutor {
     private final BoxStore boxStore;
 
     public ObjectBoxThreadPool(BoxStore boxStore) {
-        super(0, Integer.MAX_VALUE, 20L, TimeUnit.SECONDS, new SynchronousQueue<Runnable>(),
+        super(0, Integer.MAX_VALUE, 20L, TimeUnit.SECONDS, new SynchronousQueue<>(),
                 new ObjectBoxThreadFactory());
         this.boxStore = boxStore;
     }