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[英]@ExceptionHandler for type Exception not called for Spring exception in custom ResponseEntityExceptionHandler
[英]ResponseEntityExceptionHandler is not getting called when exception occurs
我是 spring 的新手。 我正在使用 spring webmvc 開發 REST api。 對於錯誤處理,我得到了這個鏈接http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-ann-rest-spring-mvc-exceptions
我曾嘗試在我的項目中使用 ResponseEntityExceptionHandler。 但每當我的 controller 拋出異常時,它永遠不會到達這個 ResponseEntityExceptionHandler。
以下是我的代碼片段
Controller
@Controller
@RequestMapping("/hello")
public class HelloController {
private static final Logger logger = Logger.getLogger(HelloController.class);
@RequestMapping(value="/{name}", method=RequestMethod.GET)
public @ResponseBody String greet(@PathVariable(value = "name")String name ) throws InvalidInputException, ResourceNotFoundException{
logger.info("start greet() "+name );
System.out.println("start greet() "+name);
String message = null;
if("".equalsIgnoreCase(name))
{
throw new InvalidInputException("Invalid Input");
}
List<String> names = new ArrayList<String>();
names.add("Harshal");
names.add("Smitesh");
if(names.contains(name)){
message = "Hello "+ name;
}else{
throw new ResourceNotFoundException("Requested Resource not found");
}
System.out.println("end greet");
logger.info("end greet()");
return message;
}
}
例外
package com.practice.errorhandlerdemo.exception;
public class InvalidInputException extends RuntimeException{
private static final long serialVersionUID = 5489516240608806490L;
public InvalidInputException() {
super("Invalid Input");
}
public InvalidInputException(String message) {
super(message);
}
}
package com.practice.errorhandlerdemo.exception;
public class ResourceNotFoundException extends RuntimeException {
private static final long serialVersionUID = -4041009155673754859L;
public ResourceNotFoundException() {
super("requested resource not found");
}
public ResourceNotFoundException(String message) {
super(message);
}
}
異常處理程序
@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
private static final Logger logger = Logger.getLogger(RestResponseEntityExceptionHandler.class);
@ExceptionHandler(value={ResourceNotFoundException.class})
@ResponseStatus(value=HttpStatus.NOT_FOUND)
protected ResponseEntity<Object> handleResourceNotFound(RuntimeException ex, WebRequest request){
logger.info("start handleResourceNotFound()");
String bodyOfResponse = "Requested resource does not found";
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.APPLICATION_JSON);
return handleExceptionInternal(ex, bodyOfResponse, httpHeaders, HttpStatus.NOT_FOUND, request);
}
@ExceptionHandler(value={InvalidInputException.class})
@ResponseStatus(value=HttpStatus.BAD_REQUEST)
protected ResponseEntity<Object> handleInvalidInput(RuntimeException ex, WebRequest request){
logger.info("start handleInvalidInput()");
String bodyOfResponse = "Invalid Input";
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.APPLICATION_JSON);
return handleExceptionInternal(ex, bodyOfResponse, httpHeaders, HttpStatus.BAD_REQUEST, request);
}
}
調度程序 servlet
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.practice.errorhandlerdemo.controller"/>
<context:annotation-config/>
</beans>
web.xml
<web-app>
<display-name>ErrorHandlerDemo</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/my-servlet.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
首先,檢查您的配置是否考慮了您的@ControllerAdvice
注釋類:它是否位於 Spring 掃描的包中? 您是否以其他方式將其聲明為 bean?
此外,如果您不需要它提供的所有異常映射,則不需要擴展ResponseEntityExceptionHandler
。
編寫異常處理的更簡單方法:
@ControllerAdvice
public class RestResponseEntityExceptionHandler {
@ExceptionHandler(ResourceNotFoundException.class)
protected ResponseEntity<String> handleResourceNotFound(ResourceNotFoundException ex){
return ResponseEntity
.status(HttpStatus.NOT_FOUND)
.body("Requested resource does not found");
}
@ExceptionHandler(InvalidInputException.class)
protected ResponseEntity<String> handleInvalidInput(InvalidInputException ex){
return ResponseEntity
.badRequest()
.body("Invalid Input");
}
}
請注意, ResponseEntity
builder API 已在 Spring 4.1 中引入,但您可以在 4.0.x 上使用常規構造函數。
我在 Spring WebMVC 4.2.5 中遇到了同樣的問題。 原因是DispatcherServlet
的throwExceptionIfNoHandlerFound
參數。 默認情況下,它的值為false
,因此所有錯誤都會生成HttpServletResponse.SC_NOT_FOUND
servlet 響應,並且不會拋出異常。
將其設置為 true 后,我的@ExceptionHandlers
開始工作
問題是您的@ExceptionHandler 聲明了ResourceNotFoundException,而作為handleResourceNotFound 的參數,您期望RuntimeException。 參數 exception 和 ExceptionHandler 的值應該匹配。
所以應該是:
@ExceptionHandler(value={ResourceNotFoundException.class})
protected ResponseEntity<Object> handleResourceNotFound(ResourceNotFoundException ex, WebRequest request){
}
一些解決方法,
ResponseEntityExceptionHandler
。ResponseEntityExceptionHandler::handleException
方法中放置一個斷點。NoHandlerFoundException
,您應該將 DispatcherServlet 配置為在找不到任何處理程序時拋出異常,請在此處鏈接。有一些報告的情況是ResponseEntityExceptionHandler
和@ControllerAdvice
都不起作用。
他們都應該將類下帶有@ExceptionHandler
注解的方法編譯到所有控制器都可以引用的公共位置。
如果它不適合你。 您可以將@ExceptionHandler
方法添加到由所有其他控制器擴展的通用AbstractController
類中。
你只需要一些配置
在 application.properties 或 application.yml 中:
server.error.whitelabel.enabled=false
spring.mvc.throw-exception-if-no-handler-found=true
spring.resources.add-mappings=false
在 springboot 上加載您的配置文件:
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "xx.xxx.xxxx")
@PropertySource("classpath:application.yml")
public class WebAppConfig {
}
提供一個@ExceptionHandler
方法來處理內部 Spring MVC 異常。 此方法返回一個ResponseEntity
用於使用消息轉換器寫入響應,而DefaultHandlerExceptionResolver
返回一個ModelAndView
。
改進@Javasick 對我有用的答案。
如何將ThrowExceptionIfNoHandlerFound 設置為true。
public class AppSetting extends AbstractAnnotationConfigDispatcherServletInitializer {
@NonNull
@Override
protected DispatcherServlet createDispatcherServlet(@NonNull WebApplicationContext servletAppContext) {
final DispatcherServlet servlet = (DispatcherServlet) super.createDispatcherServlet(servletAppContext);
servlet.setThrowExceptionIfNoHandlerFound(true);
return servlet;
}
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