Вместо простого вернулся огромный JSON
Я пишу действительно простые алгоритмы, чтобы лучше понять Rest.
Я написал следующий код:
@RestController
class DoubleController {
@GetMapping("/doubling")
public Object doubling(@RequestParam Integer input) {
if (input != null) {
return new DoubledValue(input);
}
return new Error("Please provide an input");
}
}
Хотя он хорошо работает, если вводится, но в противном случае он возвращает огромный JSON, а не только ожидаемый. В моем классе Error есть только одно поле, и я хотел бы вернуть что-то вроде
{
"error": "Please provide an input!"
}
Я получаю следующее сообщение JSON:
{"cause":null,"stackTrace":[{"methodName":"doubling","fileName":"DoubleController.java","lineNumber":16,"className":"com.example.demo.Controllers.DoubleController","nativeMethod":false},{"methodName":"invoke0","fileName":"NativeMethodAccessorImpl.java","lineNumber":-2,"className":"sun.reflect.NativeMethodAccessorImpl","nativeMethod":true},{"methodName":"invoke","fileName":"NativeMethodAccessorImpl.java","lineNumber":62,"className":"sun.reflect.NativeMethodAccessorImpl","nativeMethod":false},{"methodName":"invoke","fileName":"DelegatingMethodAccessorImpl.java","lineNumber":43,"className":"sun.reflect.DelegatingMethodAccessorImpl","nativeMethod":false},{"methodName":"invoke","fileName":"Method.java","lineNumber":498,"className":"java.lang.reflect.Method","nativeMethod":false},{"methodName":"doInvoke","fileName":"InvocableHandlerMethod.java","lineNumber":189,"className":"org.springframework.web.method.support.InvocableHandlerMethod","nativeMethod":false},{"methodName":"invokeForRequest","fileName":"InvocableHandlerMethod.java","lineNumber":138,"className":"org.springframework.web.method.support.InvocableHandlerMethod","nativeMethod":false},{"methodName":"invokeAndHandle","fileName":"ServletInvocableHandlerMethod.java","lineNumber":102,"className":"org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod","nativeMethod":false},{"methodName":"invokeHandlerMethod","fileName":"RequestMappingHandlerAdapter.java","lineNumber":895,"className":"org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter","nativeMethod":false},{"methodName":"handleInternal","fileName":"RequestMappingHandlerAdapter.java","lineNumber":800,"className":"org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter","nativeMethod":false},{"methodName":"handle","fileName":"AbstractHandlerMethodAdapter.java","lineNumber":87,"className":"org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter","nativeMethod":false},{"methodName":"doDispatch","fileName":"DispatcherServlet.java","lineNumber":1038,"className":"org.springframework.web.servlet.DispatcherServlet","nativeMethod":false},{"methodName":"doService","fileName":"DispatcherServlet.java","lineNumber":942,"className":"org.springframework.web.servlet.DispatcherServlet","nativeMethod":false},{"methodName":"processRequest","fileName":"FrameworkServlet.java","lineNumber":1005,"className":"org.springframework.web.servlet.FrameworkServlet","nativeMethod":false},{"methodName":"doGet","fileName":"FrameworkServlet.java","lineNumber":897,"className":"org.springframework.web.servlet.FrameworkServlet","nativeMethod":false},{"methodName":"service","fileName":"HttpServlet.java","lineNumber":634,"className":"javax.servlet.http.HttpServlet","nativeMethod":false},{"methodName":"service","fileName":"FrameworkServlet.java","lineNumber":882,"className":"org.springframework.web.servlet.FrameworkServlet","nativeMethod":false},{"methodName":"service","fileName":"HttpServlet.java","lineNumber":741,"className":"javax.servlet.http.HttpServlet","nativeMethod":false},{"methodName":"internalDoFilter","fileName":"ApplicationFilterChain.java","lineNumber":231,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"ApplicationFilterChain.java","lineNumber":166,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"WsFilter.java","lineNumber":53,"className":"org.apache.tomcat.websocket.server.WsFilter","nativeMethod":false},{"methodName":"internalDoFilter","fileName":"ApplicationFilterChain.java","lineNumber":193,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"ApplicationFilterChain.java","lineNumber":166,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilterInternal","fileName":"RequestContextFilter.java","lineNumber":99,"className":"org.springframework.web.filter.RequestContextFilter","nativeMethod":false},{"methodName":"doFilter","fileName":"OncePerRequestFilter.java","lineNumber":107,"className":"org.springframework.web.filter.OncePerRequestFilter","nativeMethod":false},{"methodName":"internalDoFilter","fileName":"ApplicationFilterChain.java","lineNumber":193,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"ApplicationFilterChain.java","lineNumber":166,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilterInternal","fileName":"FormContentFilter.java","lineNumber":92,"className":"org.springframework.web.filter.FormContentFilter","nativeMethod":false},{"methodName":"doFilter","fileName":"OncePerRequestFilter.java","lineNumber":107,"className":"org.springframework.web.filter.OncePerRequestFilter","nativeMethod":false},{"methodName":"internalDoFilter","fileName":"ApplicationFilterChain.java","lineNumber":193,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"ApplicationFilterChain.java","lineNumber":166,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilterInternal","fileName":"HiddenHttpMethodFilter.java","lineNumber":93,"className":"org.springframework.web.filter.HiddenHttpMethodFilter","nativeMethod":false},{"methodName":"doFilter","fileName":"OncePerRequestFilter.java","lineNumber":107,"className":"org.springframework.web.filter.OncePerRequestFilter","nativeMethod":false},{"methodName":"internalDoFilter","fileName":"ApplicationFilterChain.java","lineNumber":193,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"ApplicationFilterChain.java","lineNumber":166,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilterInternal","fileName":"CharacterEncodingFilter.java","lineNumber":200,"className":"org.springframework.web.filter.CharacterEncodingFilter","nativeMethod":false},{"methodName":"doFilter","fileName":"OncePerRequestFilter.java","lineNumber":107,"className":"org.springframework.web.filter.OncePerRequestFilter","nativeMethod":false},{"methodName":"internalDoFilter","fileName":"ApplicationFilterChain.java","lineNumber":193,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"doFilter","fileName":"ApplicationFilterChain.java","lineNumber":166,"className":"org.apache.catalina.core.ApplicationFilterChain","nativeMethod":false},{"methodName":"invoke","fileName":"StandardWrapperValve.java","lineNumber":199,"className":"org.apache.catalina.core.StandardWrapperValve","nativeMethod":false},{"methodName":"invoke","fileName":"StandardContextValve.java","lineNumber":96,"className":"org.apache.catalina.core.StandardContextValve","nativeMethod":false},{"methodName":"invoke","fileName":"AuthenticatorBase.java","lineNumber":490,"className":"org.apache.catalina.authenticator.AuthenticatorBase","nativeMethod":false},{"methodName":"invoke","fileName":"StandardHostValve.java","lineNumber":139,"className":"org.apache.catalina.core.StandardHostValve","nativeMethod":false},{"methodName":"invoke","fileName":"ErrorReportValve.java","lineNumber":92,"className":"org.apache.catalina.valves.ErrorReportValve","nativeMethod":false},{"methodName":"invoke","fileName":"StandardEngineValve.java","lineNumber":74,"className":"org.apache.catalina.core.StandardEngineValve","nativeMethod":false},{"methodName":"service","fileName":"CoyoteAdapter.java","lineNumber":343,"className":"org.apache.catalina.connector.CoyoteAdapter","nativeMethod":false},{"methodName":"service","fileName":"Http11Processor.java","lineNumber":408,"className":"org.apache.coyote.http11.Http11Processor","nativeMethod":false},{"methodName":"process","fileName":"AbstractProcessorLight.java","lineNumber":66,"className":"org.apache.coyote.AbstractProcessorLight","nativeMethod":false},{"methodName":"process","fileName":"AbstractProtocol.java","lineNumber":791,"className":"org.apache.coyote.AbstractProtocol$ConnectionHandler","nativeMethod":false},{"methodName":"doRun","fileName":"NioEndpoint.java","lineNumber":1417,"className":"org.apache.tomcat.util.net.NioEndpoint$SocketProcessor","nativeMethod":false},{"methodName":"run","fileName":"SocketProcessorBase.java","lineNumber":49,"className":"org.apache.tomcat.util.net.SocketProcessorBase","nativeMethod":false},{"methodName":"runWorker","fileName":"ThreadPoolExecutor.java","lineNumber":1149,"className":"java.util.concurrent.ThreadPoolExecutor","nativeMethod":false},{"methodName":"run","fileName":"ThreadPoolExecutor.java","lineNumber":624,"className":"java.util.concurrent.ThreadPoolExecutor$Worker","nativeMethod":false},{"methodName":"run","fileName":"TaskThread.java","lineNumber":61,"className":"org.apache.tomcat.util.threads.TaskThread$WrappingRunnable","nativeMethod":false},{"methodName":"run","fileName":"Thread.java","lineNumber":748,"className":"java.lang.Thread","nativeMethod":false}],"localizedMessage":"Please provide an input","message":"Please provide an input","suppressed":[]}
Как мне решить эту проблему? Заранее спасибо.
Ответы 2
"Огромный" JSON, который вы получаете, является сообщением об ошибке Spring Boot по умолчанию, вероятно, потому, что он не может найти подходящий маршрут. По умолчанию ваш метод-обработчик ожидает аргумент немного. Если ничего не указано, не удается найти ваш метод обработчика.
Попробуйте изменить его на:
public Object doubling(@RequestParam(required=false) Integer input) {
@CsongiNagy, без проблем. Я был там, так что это было идеально описательно, ха-ха
К сожалению, это не единственная проблема. Я установил required = false, но ничего не изменилось.
@CsongiNagy Можете ли вы опубликовать полученный JSON?
@CsongiNagy, можете ли вы опубликовать это как редактирование исходного вопроса?
Позвольте нам продолжить обсуждение в чате.
Убедитесь, что у вас есть класс Error и вы импортировали его в класс DoubleController.
public class Error implements Serializable {
private String message;
public Error() {
}
public Error(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message ;
}
}
import com.yourproject.models.Error;
@RestController
class DoubleController {
.....
}
Большое спасибо! Проблема заключалась в том, что я не импортировал свой класс Error, поэтому он мог использовать какой-то встроенный класс Java.
Спасибо, и извините за не совсем описательный термин, который я использовал :)