diff --git a/NST/src/main/java/com/ebay/jsonpath/JPBooleanCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPBooleanCheck.java
index b576636..5c234f7 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPBooleanCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPBooleanCheck.java
@@ -15,7 +15,7 @@ public class JPBooleanCheck implements JsonPathExecutor, NullCheck<JPBooleanChec
   private static final long serialVersionUID = 888395578771081432L;
 
   private Boolean expectedValue = null;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run the baseline checks for a boolean - not null.
@@ -47,13 +47,13 @@ public Boolean getExpectedValue() {
 
   @Override
   public JPBooleanCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPDoubleCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPDoubleCheck.java
index 7375b2b..cc8a167 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPDoubleCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPDoubleCheck.java
@@ -15,7 +15,7 @@ public class JPDoubleCheck implements JsonPathExecutor, NullCheck<JPDoubleCheck>
   private static final long serialVersionUID = -202076040776990133L;
 
   private Double expectedValue = null;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run the baseline checks for a double - not null.
@@ -47,13 +47,13 @@ public Double getExpectedValue() {
 
   @Override
   public JPDoubleCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPIntegerCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPIntegerCheck.java
index 4e0a01a..a0ed181 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPIntegerCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPIntegerCheck.java
@@ -15,7 +15,7 @@ public class JPIntegerCheck implements JsonPathExecutor, NullCheck<JPIntegerChec
   private static final long serialVersionUID = 5372890880704649745L;
 
   private Integer expectedValue = null;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run the baseline checks for an integer - not null.
@@ -47,13 +47,13 @@ public Integer getExpectedValue() {
 
   @Override
   public JPIntegerCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPJsonArrayCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPJsonArrayCheck.java
index 8dfa1fc..fd2fa2a 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPJsonArrayCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPJsonArrayCheck.java
@@ -21,7 +21,7 @@ public class JPJsonArrayCheck implements JsonPathExecutor, NullCheck<JPJsonArray
   private Integer minLength;
 
   private Integer maxLength;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Set the exact length the JSON array should have.
@@ -88,13 +88,13 @@ public Integer getMaxLength() {
 
   @Override
   public JPJsonArrayCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPJsonObjectCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPJsonObjectCheck.java
index 56eebf7..950e750 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPJsonObjectCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPJsonObjectCheck.java
@@ -24,7 +24,7 @@ public class JPJsonObjectCheck implements JsonPathExecutor, NullCheck<JPJsonObje
   private LinkedHashMap<String, Object> expectedMap = null;
   private HashMap<String, Object> containsMap = null;
   private List<String> doesNotContainKeys = null;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Make sure the object has the specified number of keys.
@@ -155,13 +155,13 @@ public List<String> getDoesNotContainKeys() {
 
   @Override
   public JPJsonObjectCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @SuppressWarnings("unlikely-arg-type")
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPListOfBooleanCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPListOfBooleanCheck.java
index 6a1fa1f..f1a3e28 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPListOfBooleanCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPListOfBooleanCheck.java
@@ -27,7 +27,7 @@ public class JPListOfBooleanCheck implements JsonPathExecutor, NullCheck<JPListO
   private List<Boolean> containsValues = null;
 
   private Boolean allExpectedValue = null;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run baseline checks for a list of Booleans - list is not null and indexes
@@ -177,13 +177,13 @@ public Boolean getAllExpectedValue() {
 
   @Override
   public JPListOfBooleanCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPListOfDoubleCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPListOfDoubleCheck.java
index 01c6f4a..bf92e06 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPListOfDoubleCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPListOfDoubleCheck.java
@@ -27,7 +27,7 @@ public class JPListOfDoubleCheck implements JsonPathExecutor, NullCheck<JPListOf
   private List<Double> containsValues = null;
 
   private Double allExpectedValue = null;
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run baseline checks for a list of Doubles - list is not null and indexes
@@ -177,13 +177,13 @@ public Double getAllExpectedValue() {
 
   @Override
   public JPListOfDoubleCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPListOfIntegerCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPListOfIntegerCheck.java
index 610c090..da6ea61 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPListOfIntegerCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPListOfIntegerCheck.java
@@ -28,7 +28,7 @@ public class JPListOfIntegerCheck implements JsonPathExecutor, NullCheck<JPListO
 
   private Integer allExpectedValue = null;
 
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run baseline checks for a list of Integers - list is not null and indexes
@@ -179,13 +179,13 @@ public Integer getAllExpectedValue() {
 
   @Override
   public JPListOfIntegerCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPListOfStringCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPListOfStringCheck.java
index e0554c0..d3dbf49 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPListOfStringCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPListOfStringCheck.java
@@ -30,7 +30,7 @@ public class JPListOfStringCheck implements JsonPathExecutor, NullCheck<JPListOf
 
   private List<String> limitedToValues = null;
 
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run baseline checks for a list of strings - list is not null and indexes
@@ -207,13 +207,13 @@ public String getAllExpectedValue() {
 
   @Override
   public JPListOfStringCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override
diff --git a/NST/src/main/java/com/ebay/jsonpath/JPStringCheck.java b/NST/src/main/java/com/ebay/jsonpath/JPStringCheck.java
index e07e8b3..50a5c0e 100644
--- a/NST/src/main/java/com/ebay/jsonpath/JPStringCheck.java
+++ b/NST/src/main/java/com/ebay/jsonpath/JPStringCheck.java
@@ -29,7 +29,7 @@ public class JPStringCheck implements JsonPathExecutor, NullCheck<JPStringCheck>
 
   private Integer maximumNumberOfCharacters = null;
 
-  private boolean isNull = false;
+  private boolean nullExpected = false;
 
   /**
    * Run the baseline checks for a String - not null and not empty.
@@ -182,13 +182,13 @@ public String getMatchesPattern() {
 
   @Override
   public JPStringCheck checkIsNull(boolean mustBeNull) {
-    isNull = mustBeNull;
+    nullExpected = mustBeNull;
     return this;
   }
 
   @Override
   public boolean isNullExpected() {
-    return isNull;
+    return nullExpected;
   }
 
   @Override