异常解决记录：Invalid token character ' ' in token "q "] with root cause

于 2019-04-12 14:53:00 发布
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文章标签： java json 测试
原文链接：https://my.oschina.net/u/3874846/blog/3035990
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严重: Servlet.service() for servlet [SpringMVC] in context with path [/] threw exception
 [Request processing failed; nested exception is java.lang.IllegalArgumentException: 
Invalid token character ' ' in token "q "] with root cause
java.lang.IllegalArgumentException: Invalid token character ' ' in token "q "
	at org.springframework.http.MediaType.checkToken(MediaType.java:352)
	at org.springframework.http.MediaType.checkParameters(MediaType.java:360)
	at org.springframework.http.MediaType.<init>(MediaType.java:333)
	at org.springframework.http.MediaType.parseMediaType(MediaType.java:673)
	at org.springframework.http.MediaType.parseMediaTypes(MediaType.java:691)
	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition.getAcceptedMediaTypes(ProducesRequestCondition.java:214)
	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition.access$4(ProducesRequestCondition.java:211)
	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition$ProduceMediaTypeExpression.matchMediaType(ProducesRequestCondition.java:283)
	at org.springframework.web.servlet.mvc.condition.AbstractMediaTypeExpression.match(AbstractMediaTypeExpression.java:63)
	at org.springframework.web.servlet.mvc.condition.ProducesRequestCondition.getMatchingCondition(ProducesRequestCondition.java:163)
	at org.springframework.web.servlet.mvc.method.RequestMappingInfo.getMatchingCondition(RequestMappingInfo.java:175)
	at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:64)
	at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.getMatchingMapping(RequestMappingInfoHandlerMapping.java:1)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.addMatchingMappings(AbstractHandlerMethodMapping.java:284)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:251)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:216)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:1)
	at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:288)
	at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1063)
	at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1048)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:886)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at com.suning.pylon.FlowFilter.doFilter(FlowFilter.java:45)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

服务器偶尔报上述错误，已排除程序问题，经过分析，结论如下：

【1】问题场景

调用端发送请求至服务器时候，封装的报文头格式不对，导致上述异常

【2】问题复现

1）eclispe中启动tomcat,浏览器中输入url，回车。此时报文头格式合法，浏览器能得到预期返回值

2）点击上图中的“编辑和重发”，在Accept中，把”q=0.9”改成”q =0.9”，重新请求即可在eclipse的console中打印出开头的异常信息

【3】解决办法

Spring配置文件中，<mvc:annotation-driven />换成如下配置：

<!-- 缺省使用DefaultAnnotationHandlerMapping 来注册handler method和request的mapping关系 -->
	<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
	
	<!-- 注解依赖的适配器 AnnotationMethodHandlerAdapter -->
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<property name="messageConverters">
			<list>
				<!-- Spring JSON 格式转换 -->
				<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
			</list>
		</property>
	</bean>

【4】问题分析

查看console日志，发现异常是由spring容器报出的，说明请求在spring容器做请求处理的时候出现了异常。Spring接收和处理请求的流程如下：

1ce8c24ebdaf94ba0b8e7b74897b23ef579.jpg

Spring配置文件中，外部请求预处理的配置为：<mvc:annotation-driven />，使用了annotation-driven后，缺省使用DefaultAnnotationHandlerMapping 来注册handler method和request的mapping关系。 AnnotationMethodHandlerAdapter来在实际调用handlermethod前对其参数进行处理。 其中，AnnotationMethodHandlerAdapter默认配置了以下转换器：

  • StringHttpMessageConverter
  • ByteArrayHttpMessageConverter，
  • SourceHttpMessageConverter
  • XmlAwareFromHttpMessageConverter

其中，StringHttpMessageConverter在转换请求参数时，有如下调用：

@Override
	protected String readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException {
		Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType());
		return FileCopyUtils.copyToString(new InputStreamReader(inputMessage.getBody(), charset));
	}

inputMessage.getHeaders().getContentType()返回一个MediaType实例，getContentType()方法源码如下：

public MediaType getContentType() {
        String value = getFirst(CONTENT_TYPE);
        return (value != null ? MediaType.parseMediaType(value) : null);
    }

其中MediaType.parseMediaType(value)调用了MediaType的构造函数生成MediaType实例，构造函数调用checkToken(String type)方法检查入参格式，其源码如下：

private void checkToken(String s) {
		for (int i=0; i < s.length(); i++ ) {
			char ch = s.charAt(i);
			if (!TOKEN.get(ch)) {
				throw new IllegalArgumentException("Invalid token character '" + ch + "' in token \"" + s + "\"");
			}
		}
	}

其余converter也可能存在类似问题，直接定义成MappingJacksonHttpMessageConverter，不校验类似token即可

转载于:https://my.oschina.net/u/3874846/blog/3035990

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