diff --git a/shared/resourcemapping/src/main/java/com/google/cloud/opentelemetry/resource/ResourceTranslator.java b/shared/resourcemapping/src/main/java/com/google/cloud/opentelemetry/resource/ResourceTranslator.java
index e891637c..988613f1 100644
--- a/shared/resourcemapping/src/main/java/com/google/cloud/opentelemetry/resource/ResourceTranslator.java
+++ b/shared/resourcemapping/src/main/java/com/google/cloud/opentelemetry/resource/ResourceTranslator.java
@@ -27,7 +27,7 @@
 /** Translates from OpenTelemetry Resource into Google Cloud's notion of resource. */
 public class ResourceTranslator {
 
-  private static String UNKNOWN_SERVICE_PREFIX = "unknown_service";
+  private static final String UNKNOWN_SERVICE_PREFIX = "unknown_service";
 
   private ResourceTranslator() {}
 
@@ -89,11 +89,11 @@ public static AttributeMapping create(
     }
   }
 
-  private static List<AttributeMapping> GCE_INSTANCE_LABELS =
+  private static final List<AttributeMapping> GCE_INSTANCE_LABELS =
       Arrays.asList(
           AttributeMapping.create("zone", ResourceAttributes.CLOUD_AVAILABILITY_ZONE),
           AttributeMapping.create("instance_id", ResourceAttributes.HOST_ID));
-  private static List<AttributeMapping> K8S_CONTAINER_LABELS =
+  private static final List<AttributeMapping> K8S_CONTAINER_LABELS =
       Arrays.asList(
           AttributeMapping.create(
               "location",
@@ -103,7 +103,7 @@ public static AttributeMapping create(
           AttributeMapping.create("namespace_name", ResourceAttributes.K8S_NAMESPACE_NAME),
           AttributeMapping.create("container_name", ResourceAttributes.K8S_CONTAINER_NAME),
           AttributeMapping.create("pod_name", ResourceAttributes.K8S_POD_NAME));
-  private static List<AttributeMapping> K8S_POD_LABELS =
+  private static final List<AttributeMapping> K8S_POD_LABELS =
       Arrays.asList(
           AttributeMapping.create(
               "location",
@@ -112,7 +112,7 @@ public static AttributeMapping create(
           AttributeMapping.create("cluster_name", ResourceAttributes.K8S_CLUSTER_NAME),
           AttributeMapping.create("namespace_name", ResourceAttributes.K8S_NAMESPACE_NAME),
           AttributeMapping.create("pod_name", ResourceAttributes.K8S_POD_NAME));
-  private static List<AttributeMapping> K8S_NODE_LABELS =
+  private static final List<AttributeMapping> K8S_NODE_LABELS =
       Arrays.asList(
           AttributeMapping.create(
               "location",
@@ -120,25 +120,25 @@ public static AttributeMapping create(
                   ResourceAttributes.CLOUD_AVAILABILITY_ZONE, ResourceAttributes.CLOUD_REGION)),
           AttributeMapping.create("cluster_name", ResourceAttributes.K8S_CLUSTER_NAME),
           AttributeMapping.create("node_name", ResourceAttributes.K8S_NODE_NAME));
-  private static List<AttributeMapping> K8S_CLUSTER_LABELS =
+  private static final List<AttributeMapping> K8S_CLUSTER_LABELS =
       Arrays.asList(
           AttributeMapping.create(
               "location",
               Arrays.asList(
                   ResourceAttributes.CLOUD_AVAILABILITY_ZONE, ResourceAttributes.CLOUD_REGION)),
           AttributeMapping.create("cluster_name", ResourceAttributes.K8S_CLUSTER_NAME));
-  private static List<AttributeMapping> AWS_EC2_INSTANCE_LABELS =
+  private static final List<AttributeMapping> AWS_EC2_INSTANCE_LABELS =
       Arrays.asList(
           AttributeMapping.create("instance_id", ResourceAttributes.HOST_ID),
           AttributeMapping.create("region", ResourceAttributes.CLOUD_AVAILABILITY_ZONE),
           AttributeMapping.create("aws_account", ResourceAttributes.CLOUD_ACCOUNT_ID));
-  private static List<AttributeMapping> GOOGLE_CLOUD_APP_ENGINE_INSTANCE_LABELS =
+  private static final List<AttributeMapping> GOOGLE_CLOUD_APP_ENGINE_INSTANCE_LABELS =
       Arrays.asList(
           AttributeMapping.create("module_id", ResourceAttributes.FAAS_NAME),
           AttributeMapping.create("version_id", ResourceAttributes.FAAS_VERSION),
           AttributeMapping.create("instance_id", ResourceAttributes.FAAS_INSTANCE),
           AttributeMapping.create("location", ResourceAttributes.CLOUD_REGION));
-  private static List<AttributeMapping> GENERIC_TASK_LABELS =
+  private static final List<AttributeMapping> GENERIC_TASK_LABELS =
       Arrays.asList(
           AttributeMapping.create(
               "location",
@@ -155,7 +155,7 @@ public static AttributeMapping create(
               Arrays.asList(
                   ResourceAttributes.SERVICE_INSTANCE_ID, ResourceAttributes.FAAS_INSTANCE),
               ""));
-  private static List<AttributeMapping> GENERIC_NODE_LABELS =
+  private static final List<AttributeMapping> GENERIC_NODE_LABELS =
       Arrays.asList(
           AttributeMapping.create(
               "location",