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This article mainly explains "what are the common Tomcat exceptions and solution codes". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the common Tomcat exceptions and solution codes"?

Exception one:

1. Log content

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. Solution

Add the last line to the conf/catalina.properties in the tomcat installation folder:

Org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true

Exception 2:

1. Log content

Com.alibaba.druid.stat.DruidStatService] unregister mbean errorjavax.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 (NativeMethod) 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. Solution

Modify the catalina.sh file in the bin directory of tomcat, in # OS specific support. $var _ must_ be set to either true or false. Add JAVA_OPTS= "- Ddruid.registerToSysProperty=true" to cygwin=false

Exception 3:

1. Log content

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. Solution

Modify the conf/server.xml of the tomcat installation folder. In the, the default value of maxHttpHeaderSize is 8-1024, you just need to set it to the value you need.

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