java.lang.IllegalArgumentException: No converter found for return value of type
一般是缺少jacksonjar包

	<!-- 添加jsonson支持 -->
	<dependency>
		<groupId>com.fasterxml.jackson.core</groupId>
		<artifactId>jackson-databind</artifactId>
		<version>2.7.0</version>
	</dependency>

Q.E.D.

如人饮水、冷暖自知