Fixed issue with unset property

Author: mariusvniekerk

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala

@@ -224,6 +224,7 @@ private[sql] object JDBCRDD extends Logging {
       quotedColumns,
       filters,
       parts,
+      url,
       properties)
   }
 }
@@ -241,6 +242,7 @@ private[sql] class JDBCRDD(
     columns: Array[String],
     filters: Array[Filter],
     partitions: Array[Partition],
+    url: String,
     properties: Properties)
   extends RDD[InternalRow](sc, Nil) {
 
@@ -361,7 +363,7 @@ private[sql] class JDBCRDD(
     context.addTaskCompletionListener{ context => close() }
     val part = thePart.asInstanceOf[JDBCPartition]
     val conn = getConnection()
-    val dialect = JdbcDialects.get(properties.getProperty("url"))
+    val dialect = JdbcDialects.get(url)
     import scala.collection.JavaConverters._
     dialect.beforeFetch(conn, properties.asScala.toMap)
 
@@ -496,7 +498,7 @@ private[sql] class JDBCRDD(
             try {
               conn.commit()
             } catch {
-              case e: Exception => logWarning("Exception committing transaction", e)
+              case e: Throwable => logWarning("Exception committing transaction", e)
             }
           }
           conn.close()