现象
springboot中，请求错误，或者在controller抛出异常后将自动跳转到默认错误页面，或者返回默认错误消息
代码语言：javascript复制{
"timestamp": "2020-11-19T12:15:34.957 00:00",
"status": 400,
"error": "Bad Request",
"message": "",
"path": "/comments"
}其中消息始终为空
解决
增加配置
代码语言：javascript复制server:
error:
include-binding-errors: always # 请求错误详情(参数错误等)
include-message: always # 异常消息
# include-exception: true # 异常类型
# include-stacktrace: always # 异常堆栈效果
代码语言：javascript复制{
"timestamp": "2020-11-19T12:15:34.957 00:00",
"status": 400,
"errors": [
{
"codes": [
"Size.postBody.text",
"Size.text",
"Size.java.lang.String",
"Size"
],
"arguments": [
{
"codes": [
"postBody.text",
"text"
],
"arguments": null,
"defaultMessage": "text",
"code": "text"
},
10,
0
],
"defaultMessage": "size must be between 0 and 10",
"objectName": "postBody",
"field": "text",
"rejectedValue": "my very long input",
"bindingFailure": false,
"code": "Size"
}
"error": "Bad Request",
"message": "Validation failed for object='postBody'. Error count: 1", messages.
"path": "/comments"
}相关源码
- 默认错误错误页面自动配置器
package org.springframework.boot.autoconfigure.web.servlet.error;
@Configuration(proxyBeanMethods = false)
@ConditionalOnWebApplication(type = Type.SERVLET)
@ConditionalOnClass({ Servlet.class, DispatcherServlet.class })
// Load before the main WebMvcAutoConfiguration so that the error View is available
@AutoConfigureBefore(WebMvcAutoConfiguration.class)
@EnableConfigurationProperties({ ServerProperties.class, ResourceProperties.class, WebMvcProperties.class })
public class ErrorMvcAutoConfiguration {
private final ServerProperties serverProperties;
public ErrorMvcAutoConfiguration(ServerProperties serverProperties) {
this.serverProperties = serverProperties;
}
@Bean
@ConditionalOnMissingBean(value = ErrorAttributes.class, search = SearchStrategy.CURRENT)
public DefaultErrorAttributes errorAttributes() {
return new DefaultErrorAttributes();
}
@Bean
@ConditionalOnMissingBean(value = ErrorController.class, search = SearchStrategy.CURRENT)
public BasicErrorController basicErrorController(ErrorAttributes errorAttributes,
ObjectProvider<ErrorViewResolver> errorViewResolvers) {
return new BasicErrorController(errorAttributes, this.serverProperties.getError(),
errorViewResolvers.orderedStream().collect(Collectors.toList()));
}
@Bean
public ErrorPageCustomizer errorPageCustomizer(DispatcherServletPath dispatcherServletPath) {
return new ErrorPageCustomizer(this.serverProperties, dispatcherServletPath);
}
@Bean
public static PreserveErrorControllerTargetClassPostProcessor preserveErrorControllerTargetClassPostProcessor() {
return new PreserveErrorControllerTargetClassPostProcessor();
}
@Configuration(proxyBeanMethods = false)
static class DefaultErrorViewResolverConfiguration {
private final ApplicationContext applicationContext;
private final ResourceProperties resourceProperties;
DefaultErrorViewResolverConfiguration(ApplicationContext applicationContext,
ResourceProperties resourceProperties) {
this.applicationContext = applicationContext;
this.resourceProperties = resourceProperties;
}
@Bean
@ConditionalOnBean(DispatcherServlet.class)
@ConditionalOnMissingBean(ErrorViewResolver.class)
DefaultErrorViewResolver conventionErrorViewResolver() {
return new DefaultErrorViewResolver(this.applicationContext, this.resourceProperties);
}
}
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(prefix = "server.error.whitelabel", name = "enabled", matchIfMissing = true)
@Conditional(ErrorTemplateMissingCondition.class)
protected static class WhitelabelErrorViewConfiguration {
private final StaticView defaultErrorView = new StaticView();
@Bean(name = "error")
@ConditionalOnMissingBean(name = "error")
public View defaultErrorView() {
return this.defaultErrorView;
}
// If the user adds @EnableWebMvc then the bean name view resolver from
// WebMvcAutoConfiguration disappears, so add it back in to avoid disappointment.
@Bean
@ConditionalOnMissingBean
public BeanNameViewResolver beanNameViewResolver() {
BeanNameViewResolver resolver = new BeanNameViewResolver();
resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
return resolver;
}
}
/**
* {@link SpringBootCondition} that matches when no error template view is detected.
*/
private static class ErrorTemplateMissingCondition extends SpringBootCondition {
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
ConditionMessage.Builder message = ConditionMessage.forCondition("ErrorTemplate Missing");
TemplateAvailabilityProviders providers = new TemplateAvailabilityProviders(context.getClassLoader());
TemplateAvailabilityProvider provider = providers.getProvider("error", context.getEnvironment(),
context.getClassLoader(), context.getResourceLoader());
if (provider != null) {
return ConditionOutcome.noMatch(message.foundExactly("template from " provider));
}
return ConditionOutcome.match(message.didNotFind("error template view").atAll());
}
}
/**
* Simple {@link View} implementation that writes a default HTML error page.
*/
private static class StaticView implements View {
private static final MediaType TEXT_HTML_UTF8 = new MediaType("text", "html", StandardCharsets.UTF_8);
private static final Log logger = LogFactory.getLog(StaticView.class);
@Override
public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response)
throws Exception {
if (response.isCommitted()) {
String message = getMessage(model);
logger.error(message);
return;
}
response.setContentType(TEXT_HTML_UTF8.toString());
StringBuilder builder = new StringBuilder();
Object timestamp = model.get("timestamp");
Object message = model.get("message");
Object trace = model.get("trace");
if (response.getContentType() == null) {
response.setContentType(getContentType());
}
builder.append("<html><body><h1>Whitelabel Error Page</h1>").append(
"<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>")
.append("<div id='created'>").append(timestamp).append("</div>")
.append("<div>There was an unexpected error (type=").append(htmlEscape(model.get("error")))
.append(", status=").append(htmlEscape(model.get("status"))).append(").</div>");
if (message != null) {
builder.append("<div>").append(htmlEscape(message)).append("</div>");
}
if (trace != null) {
builder.append("<div style='white-space:pre-wrap;'>").append(htmlEscape(trace)).append("</div>");
}
builder.append("</body></html>");
response.getWriter().append(builder.toString());
}
private String htmlEscape(Object input) {
return (input != null) ? HtmlUtils.htmlEscape(input.toString()) : null;
}
private String getMessage(Map<String, ?> model) {
Object path = model.get("path");
String message = "Cannot render error page for request [" path "]";
if (model.get("message") != null) {
message = " and exception [" model.get("message") "]";
}
message = " as the response has already been committed.";
message = " As a result, the response may have the wrong status code.";
return message;
}
@Override
public String getContentType() {
return "text/html";
}
}
/**
* {@link WebServerFactoryCustomizer} that configures the server's error pages.
*/
static class ErrorPageCustomizer implements ErrorPageRegistrar, Ordered {
private final ServerProperties properties;
private final DispatcherServletPath dispatcherServletPath;
protected ErrorPageCustomizer(ServerProperties properties, DispatcherServletPath dispatcherServletPath) {
this.properties = properties;
this.dispatcherServletPath = dispatcherServletPath;
}
@Override
public void registerErrorPages(ErrorPageRegistry errorPageRegistry) {
ErrorPage errorPage = new ErrorPage(
this.dispatcherServletPath.getRelativePath(this.properties.getError().getPath()));
errorPageRegistry.addErrorPages(errorPage);
}
@Override
public int getOrder() {
return 0;
}
}
/**
* {@link BeanFactoryPostProcessor} to ensure that the target class of ErrorController
* MVC beans are preserved when using AOP.
*/
static class PreserveErrorControllerTargetClassPostProcessor implements BeanFactoryPostProcessor {
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
String[] errorControllerBeans = beanFactory.getBeanNamesForType(ErrorController.class, false, false);
for (String errorControllerBean : errorControllerBeans) {
try {
beanFactory.getBeanDefinition(errorControllerBean)
.setAttribute(AutoProxyUtils.PRESERVE_TARGET_CLASS_ATTRIBUTE, Boolean.TRUE);
}
catch (Throwable ex) {
// Ignore
}
}
}
}
}- 默认错误页面控制器
package org.springframework.boot.autoconfigure.web.servlet.error;
/**
* Basic global error {@link Controller @Controller}, rendering {@link ErrorAttributes}.
* More specific errors can be handled either using Spring MVC abstractions (e.g.
* {@code @ExceptionHandler}) or by adding servlet
* {@link AbstractServletWebServerFactory#setErrorPages server error pages}.
*
* @author Dave Syer
* @author Phillip Webb
* @author Michael Stummvoll
* @author Stephane Nicoll
* @author Scott Frederick
* @since 1.0.0
* @see ErrorAttributes
* @see ErrorProperties
*/
@Controller
@RequestMapping("${server.error.path:${error.path:/error}}")
public class BasicErrorController extends AbstractErrorController {
private final ErrorProperties errorProperties;
/**
* Create a new {@link BasicErrorController} instance.
* @param errorAttributes the error attributes
* @param errorProperties configuration properties
*/
public BasicErrorController(ErrorAttributes errorAttributes, ErrorProperties errorProperties) {
this(errorAttributes, errorProperties, Collections.emptyList());
}
/**
* Create a new {@link BasicErrorController} instance.
* @param errorAttributes the error attributes
* @param errorProperties configuration properties
* @param errorViewResolvers error view resolvers
*/
public BasicErrorController(ErrorAttributes errorAttributes, ErrorProperties errorProperties,
List<ErrorViewResolver> errorViewResolvers) {
super(errorAttributes, errorViewResolvers);
Assert.notNull(errorProperties, "ErrorProperties must not be null");
this.errorProperties = errorProperties;
}
@Override
public String getErrorPath() {
return null;
}
@RequestMapping(produces = MediaType.TEXT_HTML_VALUE)
public ModelAndView errorHtml(HttpServletRequest request, HttpServletResponse response) {
HttpStatus status = getStatus(request);
Map<String, Object> model = Collections
.unmodifiableMap(getErrorAttributes(request, getErrorAttributeOptions(request, MediaType.TEXT_HTML)));
response.setStatus(status.value());
ModelAndView modelAndView = resolveErrorView(request, response, status, model);
return (modelAndView != null) ? modelAndView : new ModelAndView("error", model);
}
@RequestMapping
public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
HttpStatus status = getStatus(request);
if (status == HttpStatus.NO_CONTENT) {
return new ResponseEntity<>(status);
}
Map<String, Object> body = getErrorAttributes(request, getErrorAttributeOptions(request, MediaType.ALL));
return new ResponseEntity<>(body, status);
}
@ExceptionHandler(HttpMediaTypeNotAcceptableException.class)
public ResponseEntity<String> mediaTypeNotAcceptable(HttpServletRequest request) {
HttpStatus status = getStatus(request);
return ResponseEntity.status(status).build();
}
protected ErrorAttributeOptions getErrorAttributeOptions(HttpServletRequest request, MediaType mediaType) {
ErrorAttributeOptions options = ErrorAttributeOptions.defaults();
if (this.errorProperties.isIncludeException()) {
options = options.including(Include.EXCEPTION);
}
if (isIncludeStackTrace(request, mediaType)) {
options = options.including(Include.STACK_TRACE);
}
if (isIncludeMessage(request, mediaType)) {
options = options.including(Include.MESSAGE);
}
if (isIncludeBindingErrors(request, mediaType)) {
options = options.including(Include.BINDING_ERRORS);
}
return options;
}
/**
* Determine if the stacktrace attribute should be included.
* @param request the source request
* @param produces the media type produced (or {@code MediaType.ALL})
* @return if the stacktrace attribute should be included
*/
@SuppressWarnings("deprecation")
protected boolean isIncludeStackTrace(HttpServletRequest request, MediaType produces) {
switch (getErrorProperties().getIncludeStacktrace()) {
case ALWAYS:
return true;
case ON_PARAM:
case ON_TRACE_PARAM:
return getTraceParameter(request);
default:
return false;
}
}
/**
* Determine if the message attribute should be included.
* @param request the source request
* @param produces the media type produced (or {@code MediaType.ALL})
* @return if the message attribute should be included
*/
protected boolean isIncludeMessage(HttpServletRequest request, MediaType produces) {
switch (getErrorProperties().getIncludeMessage()) {
case ALWAYS:
return true;
case ON_PARAM:
return getMessageParameter(request);
default:
return false;
}
}
/**
* Determine if the errors attribute should be included.
* @param request the source request
* @param produces the media type produced (or {@code MediaType.ALL})
* @return if the errors attribute should be included
*/
protected boolean isIncludeBindingErrors(HttpServletRequest request, MediaType produces) {
switch (getErrorProperties().getIncludeBindingErrors()) {
case ALWAYS:
return true;
case ON_PARAM:
return getErrorsParameter(request);
default:
return false;
}
}
/**
* Provide access to the error properties.
* @return the error properties
*/
protected ErrorProperties getErrorProperties() {
return this.errorProperties;
}
}
