public KafkaSource outputType(String outputType) {
		Assert.hasText(outputType, "outputType must not be empty nor null");
		this.outputType = outputType;
		return this;
	}
set the outputType for the kafka source

@param outputType the output type to be used.
@return instance of the kafka source
spring-xd-test-fixtures/src/main/java/org/springframework/xd/test/fixtures/KafkaSource.java