Recently learning to spark, need to remote to submit, I wrote a Java class to submit written scala SparkApplication jar packages, use the yarn - client can submit success, for convenience, I want to have a web and click the submit button can be directly submitted to spark program, but encountered a problem, the spark - assembly - 1.3.0 - hadoop2.6.0 - cdh5.4.0. In a jar javax.mail/servlet/servlet class in Tomcat servlet - API. Jar conflict, leading to failure, the request to the more understanding of the great spirit guide, thank you!