Final some member variables CTR
diff --git a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/HasStep.java b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/HasStep.java
index caecd48..6048ba7 100644
--- a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/HasStep.java
+++ b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/HasStep.java
@@ -40,7 +40,7 @@
  */
 public class HasStep<S extends Element> extends FilterStep<S> implements HasContainerHolder, Configuring {
 
-    private Parameters parameters = new Parameters();
+    private final Parameters parameters = new Parameters();
     private List<HasContainer> hasContainers;
 
     public HasStep(final Traversal.Admin traversal, final HasContainer... hasContainers) {
diff --git a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/TraversalFilterStep.java b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/TraversalFilterStep.java
index 20ba3c6..ec37a3f 100644
--- a/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/TraversalFilterStep.java
+++ b/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/TraversalFilterStep.java
@@ -35,7 +35,7 @@
  * @author Marko A. Rodriguez (http://markorodriguez.com)
  */
 public final class TraversalFilterStep<S> extends FilterStep<S> implements TraversalParent, Configuring {
-    private Parameters parameters = new Parameters();
+    private final Parameters parameters = new Parameters();
 
     private Traversal.Admin<S, ?> filterTraversal;