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最新评论
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Aqu415:
,默认是netty还是hassion?
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Python机器学习库 -
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leibnitz 写道hi,我想知道,无论在92还是94版本, ...
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hbase的行锁与多版本并发控制(MVCC) -
107x:
不错,谢谢!
Latent Semantic Analysis(LSA/ LSI)算法简介
今天发现spring mvc把一个view参数匹配异常(org.springframework.web.bind.MissingServletRequestParameterException: Required String parameter 'tagSet' is not present)吃掉了:
1.通过debug发现Exception
2.异常被processHanderException方法处理,但直接返回Null,没有打印异常。
问题查找
通过debug发现是通过org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.handleMissingServletRequestParameter()
处理的:
protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { try { if (ex instanceof NoSuchRequestHandlingMethodException) { return handleNoSuchRequestHandlingMethod((NoSuchRequestHandlingMethodException) ex, request, response, handler); } else if (ex instanceof HttpRequestMethodNotSupportedException) { return handleHttpRequestMethodNotSupported((HttpRequestMethodNotSupportedException) ex, request, response, handler); } else if (ex instanceof HttpMediaTypeNotSupportedException) { return handleHttpMediaTypeNotSupported((HttpMediaTypeNotSupportedException) ex, request, response, handler); } else if (ex instanceof HttpMediaTypeNotAcceptableException) { return handleHttpMediaTypeNotAcceptable((HttpMediaTypeNotAcceptableException) ex, request, response, handler); } else if (ex instanceof MissingServletRequestParameterException) { return handleMissingServletRequestParameter((MissingServletRequestParameterException) ex, request, response, handler); } else if (ex instanceof ServletRequestBindingException) { return handleServletRequestBindingException((ServletRequestBindingException) ex, request, response, handler); } else if (ex instanceof ConversionNotSupportedException) { return handleConversionNotSupported((ConversionNotSupportedException) ex, request, response, handler); } else if (ex instanceof TypeMismatchException) { return handleTypeMismatch((TypeMismatchException) ex, request, response, handler); } else if (ex instanceof HttpMessageNotReadableException) { return handleHttpMessageNotReadable((HttpMessageNotReadableException) ex, request, response, handler); } else if (ex instanceof HttpMessageNotWritableException) { return handleHttpMessageNotWritable((HttpMessageNotWritableException) ex, request, response, handler); } else if (ex instanceof MethodArgumentNotValidException) { return handleMethodArgumentNotValidException((MethodArgumentNotValidException) ex, request, response, handler); } else if (ex instanceof MissingServletRequestPartException) { return handleMissingServletRequestPartException((MissingServletRequestPartException) ex, request, response, handler); } } catch (Exception handlerException) { logger.warn("Handling of [" + ex.getClass().getName() + "] resulted in Exception", handlerException); } return null; }
protected ModelAndView handleMissingServletRequestParameter(MissingServletRequestParameterException ex, HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException { response.sendError(HttpServletResponse.SC_BAD_REQUEST); return new ModelAndView(); }
那么DefaultHandlerExceptionResolver怎么被初始化的? 发现是在DispatcherServlet.initHandlerExceptionResolvers()负责初始化。
private void initHandlerExceptionResolvers(ApplicationContext context) { this.handlerExceptionResolvers = null; if (this.detectAllHandlerExceptionResolvers) { // Find all HandlerExceptionResolvers in the ApplicationContext, including ancestor contexts. Map<String, HandlerExceptionResolver> matchingBeans = BeanFactoryUtils .beansOfTypeIncludingAncestors(context, HandlerExceptionResolver.class, true, false); if (!matchingBeans.isEmpty()) { this.handlerExceptionResolvers = new ArrayList<HandlerExceptionResolver>(matchingBeans.values()); // We keep HandlerExceptionResolvers in sorted order. OrderComparator.sort(this.handlerExceptionResolvers); } } else { try { HandlerExceptionResolver her = context.getBean(HANDLER_EXCEPTION_RESOLVER_BEAN_NAME, HandlerExceptionResolver.class); this.handlerExceptionResolvers = Collections.singletonList(her); } catch (NoSuchBeanDefinitionException ex) { // Ignore, no HandlerExceptionResolver is fine too. } } // Ensure we have at least some HandlerExceptionResolvers, by registering // default HandlerExceptionResolvers if no other resolvers are found. if (this.handlerExceptionResolvers == null) { this.handlerExceptionResolvers = getDefaultStrategies(context, HandlerExceptionResolver.class); if (logger.isDebugEnabled()) { logger.debug("No HandlerExceptionResolvers found in servlet '" + getServletName() + "': using default"); } } }
那么我们只需要实现一个继承于DefaultHandlerExceptionResolver的类,然后会被spring通过BeanFactoryUtils.beansOfTypeIncludingAncestors(context, HandlerExceptionResolver.class, true, false);加载
评论
3 楼
zhengwei49
2013-06-19
public class CustomHandlerExceptionResolver extends DefaultHandlerExceptionResolver { private static final Logger LOG = LoggerFactory .getLogger(CustomHandlerExceptionResolver.class); @Override protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { LOG.error(request.getRequestURI(), ex); return super.doResolveException(request, response, handler, ex); } }
<bean id="customHandlerExceptionResolver" class="org.xxxxx.CustomHandlerExceptionResolver" p:order="1"/>
注意配置order ,不然会被DefaultHandlerExceptionResolver抢先(ps. in SpringFramework 3.2.3 Release)
2 楼
san_yun
2012-12-31
你要在spring的bean配置文件里面配置啊
1 楼
jackychen1981
2012-12-30
请问下怎么注入继承DefaultHandlerExceptionResolver的类啊,我在继承以后还是执行这个DefaultHandlerExceptionResolver默认的,急求指教
发表评论
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spring 框架快速启动
2012-12-18 18:36 10631. 通过maven新建工程 2. 添加依赖包 &l ... -
spring的FactoryBean机制
2012-11-20 16:18 1143spring可以通过的FactoryBean的形式把一个Fac ... -
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2012-10-02 18:42 2100spring作为一个beanFactory,免不了要做类型转化 ... -
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Spring Security入门
2012-08-13 15:52 1165参考官方文档(http://www.mossle.com/do ... -
Spring对Ibatis的封装
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