diff --git a/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupAttrName.java b/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupAttrName.java
index fc194fe..dd150a2 100644
--- a/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupAttrName.java
+++ b/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupAttrName.java
@@ -20,6 +20,7 @@
  */
 
 import java.io.Serializable;
+import java.util.Objects;
 
 /**
  * Description of the Class
@@ -36,9 +37,6 @@
     /** the name of the attribute */
     public final T attrName;
 
-    /** Cached toString value */
-    private String toString;
-
     /**
      * Constructor for the GroupAttrName object
      * @param groupId
@@ -71,16 +69,7 @@
 
         if (groupId.equals( to.groupId ))
         {
-            if (attrName == null && to.attrName == null)
-            {
-                return true;
-            }
-            else if (attrName == null || to.attrName == null)
-            {
-                return false;
-            }
-
-            return  attrName.equals( to.attrName );
+            return Objects.equals(attrName, to.attrName);
         }
 
         return false;
@@ -92,12 +81,7 @@
     @Override
     public int hashCode()
     {
-        if (attrName == null)
-        {
-            return groupId.hashCode();
-        }
-
-        return groupId.hashCode() ^ attrName.hashCode();
+        return Objects.hash(groupId, attrName);
     }
 
     /**
@@ -106,12 +90,7 @@
     @Override
     public String toString()
     {
-        if ( toString == null )
-        {
-            toString = "[GAN: groupId=" + groupId + ", attrName=" + attrName + "]";
-        }
-
-        return toString;
+        return String.format("GAN:%s:%s", groupId, Objects.toString(attrName, ""));
     }
 
 }
diff --git a/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupId.java b/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupId.java
index 86f90b6..fa4bee4 100644
--- a/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupId.java
+++ b/commons-jcs-core/src/main/java/org/apache/commons/jcs3/engine/control/group/GroupId.java
@@ -20,6 +20,7 @@
  */
 
 import java.io.Serializable;
+import java.util.Objects;
 
 /**
  * Used to avoid name conflict when group cache items are mixed with non-group cache items in the
@@ -37,9 +38,6 @@
     /** the name of the region. */
     public final String cacheName;
 
-    /** Cached toString value. */
-    private String toString;
-
     /**
      * Constructor for the GroupId object
      * <p>
@@ -77,27 +75,22 @@
     }
 
     /**
-     * @return cacheName.hashCode() + groupName.hashCode();
+     * @return Objects.hash(cacheName, groupName);
      */
     @Override
     public int hashCode()
     {
-        return cacheName.hashCode() + groupName.hashCode();
+        return Objects.hash(cacheName, groupName);
     }
 
     /**
-     * Caches the value.
-     * <p>
-     * @return debugging string.
+     * Convert to string
+     *
+     * @return the string representation of this ID.
      */
     @Override
     public String toString()
     {
-        if ( toString == null )
-        {
-            toString = "[groupId=" + cacheName + ", " + groupName + ']';
-        }
-
-        return toString;
+        return String.format("[groupId=%s, %s]", cacheName, groupName);
     }
 }