spark编译出错：bad symbolic reference. A signature in Utils.class refers to term concurrent in value com.google.common.util which is not available.

环境： CentOs 6.4
spark: spark-1.2.0-cdh5.3.6

编译到最后external/kafka报错： bad symbolic reference. A signature in Utils.class refers to term concurrent in value com.google.common.util which is not available.

原因是：kafka项目引用了Utils.scala，Utils.scala引用guava包，而guava包只是provided用于编译，kafka项目中并没有guava包

解决方法：在kafka pom文件增加guava依赖

    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>14.0.1</version>        
    </dependency>

重新编译，编译成功