diff --git a/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbUtil.java b/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbUtil.java
index 2938167d..6cfcc8bf 100644
--- a/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbUtil.java
+++ b/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbUtil.java
@@ -1,20 +1,3 @@
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-
 package com.alibaba.datax.plugin.writer.selectdbwriter;
 
 import com.alibaba.datax.plugin.rdbms.util.DBUtil;
diff --git a/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterException.java b/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterException.java
index 727d7db9..f85a06d1 100644
--- a/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterException.java
+++ b/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterException.java
@@ -1,24 +1,5 @@
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-
 package com.alibaba.datax.plugin.writer.selectdbwriter;
 
-import java.io.IOException;
-import java.util.Map;
 
 public class SelectdbWriterException extends RuntimeException  {
 
diff --git a/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterManager.java b/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterManager.java
index bbb41702..479bc5c9 100644
--- a/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterManager.java
+++ b/selectdbwriter/src/main/java/com/alibaba/datax/plugin/writer/selectdbwriter/SelectdbWriterManager.java
@@ -1,20 +1,3 @@
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-
 package com.alibaba.datax.plugin.writer.selectdbwriter;
 
 import com.google.common.base.Strings;