diff --git a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/pom.xml b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/pom.xml
index 16c4ac298..a4746be70 100644
--- a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/pom.xml
+++ b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/pom.xml
@@ -63,7 +63,7 @@
         <dependency>
             <groupId>com.fasterxml.jackson.module</groupId>
             <artifactId>jackson-module-scala_2.11</artifactId>
-            <version>${jackson.version}</version>
+            <version>2.6.7</version>
         </dependency>
     </dependencies>
 
diff --git a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/src/test/java/org/deeplearning4j/spark/text/BaseSparkTest.java b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/src/test/java/org/deeplearning4j/spark/text/BaseSparkTest.java
index 738daa647..152ef4db5 100644
--- a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/src/test/java/org/deeplearning4j/spark/text/BaseSparkTest.java
+++ b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark-nlp/src/test/java/org/deeplearning4j/spark/text/BaseSparkTest.java
@@ -23,6 +23,9 @@ import org.junit.After;
 import org.junit.Before;
 
 import java.io.Serializable;
+import java.lang.reflect.Field;
+import java.util.Collections;
+import java.util.Map;
 
 /**
  * Created by agibsonccc on 1/23/15.
@@ -37,7 +40,9 @@ public abstract class BaseSparkTest implements Serializable {
 
     @After
     public void after() {
-        sc.close();
+        if(sc != null) {
+            sc.close();
+        }
         sc = null;
     }
 
@@ -48,6 +53,30 @@ public abstract class BaseSparkTest implements Serializable {
     public JavaSparkContext getContext() {
         if (sc != null)
             return sc;
+
+        //Ensure SPARK_USER environment variable is set for Spark tests
+        String u = System.getenv("SPARK_USER");
+        Map<String, String> env = System.getenv();
+        if(u == null || u.isEmpty()) {
+            try {
+                Class[] classes = Collections.class.getDeclaredClasses();
+                for (Class cl : classes) {
+                    if ("java.util.Collections$UnmodifiableMap".equals(cl.getName())) {
+                        Field field = cl.getDeclaredField("m");
+                        field.setAccessible(true);
+                        Object obj = field.get(env);
+                        Map<String, String> map = (Map<String, String>) obj;
+                        String user = System.getProperty("user.name");
+                        if (user == null || user.isEmpty())
+                            user = "user";
+                        map.put("SPARK_USER", user);
+                    }
+                }
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+
         // set to test mode
         SparkConf sparkConf = new SparkConf().setMaster("local[4]").set("spark.driver.host", "localhost")
             .setAppName("sparktest")
diff --git a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkKryoTest.java b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkKryoTest.java
index bb3a7180e..1c794ebf6 100644
--- a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkKryoTest.java
+++ b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkKryoTest.java
@@ -19,6 +19,10 @@ package org.deeplearning4j.spark;
 import org.apache.spark.SparkConf;
 import org.apache.spark.api.java.JavaSparkContext;
 
+import java.lang.reflect.Field;
+import java.util.Collections;
+import java.util.Map;
+
 /**
  * Created by Alex on 04/07/2017.
  */
@@ -30,6 +34,31 @@ public class BaseSparkKryoTest extends BaseSparkTest {
             return sc;
         }
 
+        //Ensure SPARK_USER environment variable is set for Spark Kryo tests
+        String u = System.getenv("SPARK_USER");
+        if(u == null || u.isEmpty()){
+            try {
+                Class[] classes = Collections.class.getDeclaredClasses();
+                Map<String, String> env = System.getenv();
+                for (Class cl : classes) {
+                    if ("java.util.Collections$UnmodifiableMap".equals(cl.getName())) {
+                        Field field = cl.getDeclaredField("m");
+                        field.setAccessible(true);
+                        Object obj = field.get(env);
+                        Map<String, String> map = (Map<String, String>) obj;
+                        String user = System.getProperty("user.name");
+                        if(user == null || user.isEmpty())
+                            user = "user";
+                        map.put("SPARK_USER", user);
+                    }
+                }
+            } catch (Exception e){
+                throw new RuntimeException(e);
+            }
+        }
+
+
+
         SparkConf sparkConf = new SparkConf().setMaster("local[" + numExecutors() + "]").setAppName("sparktest");
 
         sparkConf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer");
diff --git a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkTest.java b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkTest.java
index d2a6e08e1..781e3dad2 100644
--- a/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkTest.java
+++ b/deeplearning4j/deeplearning4j-scaleout/spark/dl4j-spark/src/test/java/org/deeplearning4j/spark/BaseSparkTest.java
@@ -74,7 +74,9 @@ public abstract class BaseSparkTest implements Serializable {
 
     @After
     public void after() {
-        sc.close();
+        if(sc != null) {
+            sc.close();
+        }
         sc = null;
     }
 
diff --git a/nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/evaluation/classification/ROC.java b/nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/evaluation/classification/ROC.java
index 63a5a012a..c9f5cabdf 100644
--- a/nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/evaluation/classification/ROC.java
+++ b/nd4j/nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/evaluation/classification/ROC.java
@@ -75,7 +75,6 @@ import static org.nd4j.linalg.indexing.NDArrayIndex.interval;
 @EqualsAndHashCode(callSuper = true,
         exclude = {"auc", "auprc", "probAndLabel", "exactAllocBlockSize", "rocCurve", "prCurve", "axis"})
 @Data
-@ToString(exclude = {"probAndLabel", "exactAllocBlockSize", "rocCurve", "prCurve"})
 @JsonIgnoreProperties({"probAndLabel", "exactAllocBlockSize"})
 @JsonSerialize(using = ROCSerializer.class)
 @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY)
@@ -824,6 +823,11 @@ public class ROC extends BaseEvaluation<ROC> {
         return sb.toString();
     }
 
+    @Override
+    public String toString(){
+        return stats();
+    }
+
     public double scoreForMetric(Metric metric){
         switch (metric){
             case AUROC: