[Spring] swagger2 사용시 objectMapperConfigurer bean create exception

API 문서화 도구로 swagger 를 세팅하는데 objectMapperConfigurer bean을 생성하다가 예외가 발생

maven에 jackson관련 의존성을 추가한다.

아래의 의존성 참고!

		<!-- swagge 사용 하기위한 -->

		<dependency>
		    <groupId>com.fasterxml.jackson.core</groupId>
		    <artifactId>jackson-databind</artifactId>
		    <version>2.9.8</version>
		</dependency>


		<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
		<dependency>
		    <groupId>io.springfox</groupId>
		    <artifactId>springfox-swagger2</artifactId>
		    <version>2.9.2</version>
		</dependency>
		
		<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
		<dependency>
		    <groupId>io.springfox</groupId>
		    <artifactId>springfox-swagger-ui</artifactId>
		    <version>2.9.2</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/io.swagger/swagger-annotations -->
		<dependency>
		    <groupId>io.swagger</groupId>
		    <artifactId>swagger-annotations</artifactId>
		    <version>1.5.18</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/com.fasterxml/classmate --> 
		<dependency>
    		<groupId>com.fasterxml.jackson.core</groupId>
    		<artifactId>jackson-core</artifactId>
    		<version>2.9.10</version>
		</dependency>