Added a few null pointer checks and performed minor touchups (tried improving a few equals, clone and hashCode methods).

By: VictorD <victor.danell@gmail.com>

paper-api/src/main/java/org/bukkit/util/BlockIterator.java

@@ -7,10 +7,8 @@ import org.bukkit.block.BlockFace;
 import org.bukkit.entity.LivingEntity;
 
 import java.util.Iterator;
-import java.util.ArrayList;
 import java.util.NoSuchElementException;
 import java.lang.IllegalStateException;
-import java.lang.Exception;
 
 /**
  * This class performs ray tracing and iterates along blocks on a line
@@ -23,7 +21,7 @@ public class BlockIterator implements Iterator<Block> {
     private final World  world;
     private final int    maxDistance;
 
-    private final int    gridSize = 1<<24;
+    private static final int    gridSize = 1<<24;
 
     private boolean      end = false;
 

paper-api/src/main/java/org/bukkit/util/BlockVector.java

@@ -102,6 +102,10 @@ public class BlockVector extends Vector {
      */
     @Override
     public BlockVector clone() {
-        return new BlockVector(x, y, z);
+        BlockVector v = (BlockVector)super.clone();
+        v.x = x;
+        v.y = y;
+        v.z = z;
+        return v;
     }
 }

paper-api/src/main/java/org/bukkit/util/Vector.java

@@ -522,7 +522,7 @@ public class Vector implements Cloneable {
 
         return Math.abs(x - other.x) < epsilon
                 && Math.abs(y - other.y) < epsilon
-                && Math.abs(z - other.z) < epsilon;
+                && Math.abs(z - other.z) < epsilon && (this.getClass().equals(obj.getClass()));
     }
 
     /**
@@ -546,7 +546,16 @@ public class Vector implements Cloneable {
      */
     @Override
     public Vector clone() {
-        return new Vector(x, y, z);
+        try {
+            Vector v = (Vector)super.clone();
+            v.x = x;
+            v.y = y;
+            v.z = z;
+            return v;            
+        } catch (CloneNotSupportedException e) {
+            e.printStackTrace();
+        }
+        return null;
     }
 
     /**