diff --git a/.travis.yml b/.travis.yml
index 82fffd7..95c1427 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,4 @@
 language:
-- java
 - scala
 sudo: false
 jdk:
diff --git a/streaming/src/main/scala/org/apache/gearpump/streaming/dsl/task/MergeTask.scala b/streaming/src/main/scala/org/apache/gearpump/streaming/dsl/task/MergeTask.scala
deleted file mode 100644
index 0c3c26a..0000000
--- a/streaming/src/main/scala/org/apache/gearpump/streaming/dsl/task/MergeTask.scala
+++ /dev/null
@@ -1,8 +0,0 @@
-package org.apache.gearpump.streaming.dsl.task
-
-/**
- * Created by doriadong on 2017/2/13.
- */
-class MergeTask {
-
-}