public SparkAppJob sparkAppJar(String sparkAppJar){
		Assert.hasText(sparkAppJar, "sparkAppJar must not be null or empty");
		this.sparkAppJar = sparkAppJar;
		return this;
	}
Sets the location of the spark app jar
@param sparkAppJar the location of the spark app jar
@return current instance the job.
spring-xd-test-fixtures/src/main/java/org/springframework/xd/test/fixtures/SparkAppJob.java