问题：

[ERROR] Failed to execute goal org.apache.rat:apache-rat-plugin:0.13:check (rat-check) on project cdap: 
Too many files with unapproved license: 1 See RAT report in: /home/htsc/HTSC-4.0/target/rat.txt -> [Help 1]

原因：
  使用apache-rat-plugin，代码中存在许多文件没有获得许可

解决：

  在maven命令后添加参数 -Drat.skip=true

mvn package -DskipTests -P dist,release,rpm-prepare,rpm -Drat.skip=true

或者
  读取报错中的rat.txt文件，找到Files with unapproved licenses

在没有授权的文件开头添加

/*
 * Copyright © 2016 Cask Data, Inc.
 *
 * Licensed 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.
 */