Fix the serialization issue

zsxwing · zsxwing · commit b3e7e76cfb3c · 2016-05-04T17:18:15.000-07:00
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala b/sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
@@ -115,6 +115,7 @@ class SparkSession private(
   @transient
   private var _wrapped: SQLContext = _
 
+  @transient
   private val _wrappedLock = new Object
 
   protected[sql] def wrapped: SQLContext = _wrappedLock.synchronized {
