JAVA-2071: Fix NPE in ArrayBackedRow.toString() (apache#1156)

Author: adutra

changelog/README.md

@@ -5,6 +5,7 @@
 - [improvement] JAVA-2025: Include exception message in Abstract\*Codec.accepts(null).
 - [improvement] JAVA-1980: Use covariant return types in RemoteEndpointAwareJdkSSLOptions.Builder methods.
 - [documentation] JAVA-2062: Document frozen collection preference with Mapper.
+- [bug] JAVA-2071: Fix NPE in ArrayBackedRow.toString().
 
 
 ### 3.6.0

driver-core/src/main/java/com/datastax/driver/core/ArrayBackedRow.java

@@ -123,12 +123,15 @@ public String toString() {
       if (i != 0) sb.append(", ");
       ByteBuffer bb = data.get(i);
       if (bb == null) sb.append("NULL");
-      else
-        sb.append(
-            getCodecRegistry()
-                .codecFor(metadata.getType(i))
-                .deserialize(bb, protocolVersion)
-                .toString());
+      else {
+        Object o =
+            getCodecRegistry().codecFor(metadata.getType(i)).deserialize(bb, protocolVersion);
+        if (o == null) {
+          sb.append("NULL");
+        } else {
+          sb.append(o.toString());
+        }
+      }
     }
     sb.append(']');
     return sb.toString();