JAVA程序异常：IllegalArgumentException: Unknown return value type: java.lang.Boolean

Error code

@Controller
public class TestController {

    @RequestMapping("/test")
    public Boolean test() {
        System.out.println("123");
        return true;
    }
}

Report an error

IllegalArgumentException: Unknown return value type: java.lang.Boolean

 

solve

Add @ResponseBody  or change @Controller  to @RestController

@RestController
// @Controller
// @ResponseBody
public class TestController {

    @RequestMapping("/test")
    public Boolean test() {
        System.out.println("123");
        return true;
    }
}