公司项目，开发语言为java，中间件为Tomcat，运行过程中，从Tomcat出现了一些异常，现将异常及解决办法记录如下，仅供参考。（不断在补充中.......）
异常一：
1、日志内容
org.apache.coyote.http11.AbstractHttp11Processor.process Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens
at org.apache.coyote.http11.AbstractNioInputBuffer.parseRequestLine(AbstractNioInputBuffer.java:233)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1017)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$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)
2、解决办法
在tomcat安装文件夹的 conf/catalina.properties 中最后添加一行：
org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true
异常二：
1、日志内容
com.alibaba.druid.stat.DruidStatService]unregister mbean error javax.management.InstanceNotFoundException: com.alibaba.druid:type=DruidStatService at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1095) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(DefaultMBeanServerInterceptor.java:427) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(DefaultMBeanServerInterceptor.java:415) at com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.java:546) at com.alibaba.druid.stat.DruidStatService.unregisterMBean(DruidStatService.java:374) at com.alibaba.druid.stat.DruidDataSourceStatManager.removeDataSource(DruidDataSourceStatManager.java:202) at com.alibaba.druid.pool.DruidDataSource$2.run(DruidDataSource.java:1479) at java.security.AccessController.doPrivileged(Native Method) at com.alibaba.druid.pool.DruidDataSource.unregisterMbean(DruidDataSource.java:1475) at com.alibaba.druid.pool.DruidDataSource.close(DruidDataSource.java:1434) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.beans.factory.support.DisposableBeanAdapter.invokeCustomDestroyMethod(DisposableBeanAdapter.java:354) at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:277) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:972) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:979) at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1006) at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:982) at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:934) at org.springframework.web.context.ContextLoader.closeWebApplicationContext(ContextLoader.java:583) at org.springframework.web.context.ContextLoaderListener.contextDestroyed(ContextLoaderListener.java:116) at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4900) at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5537) at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:221) at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1424) at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1413) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)
2、解决办法
修改tomcat的bin目录下的catalina.sh文件，在# OS specific support. $var _must_ be set to either true or false.与cygwin=false之间加上JAVA_OPTS="-Ddruid.registerToSysProperty=true"
异常三：
1、日志内容
INFO [http-nio-80-exec-16] org.apache.coyote.http11.AbstractHttp11Processor.process Error parsing HTTP request header Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level. java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens at org.apache.coyote.http11.AbstractNioInputBuffer.parseRequestLine(AbstractNioInputBuffer.java:236) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1065) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495) 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)
2、解决办法
修改tomcat安装文件夹的 conf/server.xml，在 <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" maxHttpHeaderSize ="10240" redirectPort="8443" />中，maxHttpHeaderSize的默认值是8*1024，你只需要调成你需要的值就好了。
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