Spring Boot Rest控制器API未返回json

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

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

@RestController
public class MyController {
    @RequestMapping("/api")
    public MyResponseObject apiMethod() {
        // 处理逻辑并返回MyResponseObject对象
    }
}

@JsonSerialize(using = MySerializer.class)
public class MyResponseObject {
    // 对象属性和方法
}

@RestController
public class MyController {
    @RequestMapping("/api")
    public MyResponseObject apiMethod() {
        // 处理逻辑并返回MyResponseObject对象
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<String> handleException(Exception e) {
        // 处理异常并返回错误信息
    }
}