Remove Weak object reference from v8WeakReference array when released

V8 uses another array called v8WeakReferences to keep the weak objects
and this array is used to get object reference count.
Thus, when weak object is released it should also be removed from
v8WeakReferences array.

Fix #347

src/main/java/com/eclipsesource/v8/V8Value.java

@@ -48,9 +48,9 @@ abstract public class V8Value implements Releasable {
     public static final int FLOAT_32_ARRAY               = 16;
     public static final int UNDEFINED                    = 99;
 
-    protected V8      v8;
-    protected long    objectHandle;
-    protected boolean released = true;
+    protected V8            v8;
+    protected long          objectHandle;
+    protected boolean       released                     = true;
 
     protected V8Value() {
         super();
@@ -83,7 +83,6 @@ protected void addObjectReference(final long objectHandle) throws Error {
         }
     }
 
-
     /**
      * Returns a string representation of the V8 Type.
      * @param type Type to return as a string. See constants in V8Value.
@@ -261,6 +260,9 @@ public void close() {
         v8.checkThread();
         if (!released) {
             try {
+                if (isWeak()) {
+                    v8.v8WeakReferences.remove(getHandle());
+                }
                 v8.releaseObjRef(this);
             } finally {
                 released = true;

src/test/java/com/eclipsesource/v8/V8ObjectTest.java

@@ -1317,7 +1317,7 @@ public void testGetTypeFunction() {
     public void testGetKeysOnObject() {
         V8Object v8Object = new V8Object(v8);
         v8Object.add("integer", 1).add("double", 1.1).add("boolean", true)
-                        .add("string", "hello, world!");
+                .add("string", "hello, world!");
 
         String[] keys = v8Object.getKeys();
 
@@ -1842,11 +1842,19 @@ public void testSetWeakMakesObjectWeak() {
 
     @SuppressWarnings("resource")
     @Test
-    public void testClearWeakMakesObjectWeak() {
+    public void testClearWeakMakesObjectNonWeak() {
         V8Value object = new V8Object(v8).setWeak().clearWeak();
 
         assertFalse(object.isWeak());
         object.close();
     }
 
+    @SuppressWarnings("resource")
+    @Test
+    public void testReleaseWeakObjectDoesNotAffectReferenceCount() {
+        new V8Object(v8).setWeak().close();
+
+        assertEquals(0, v8.getObjectReferenceCount());
+    }
+
 }