java.lang.IllegalStateException: Error starting child的处理-优快云博客

本文链接：https://blog.youkuaiyun.com/Cui6023056/article/details/103567852

本文详细解析了java.lang.IllegalStateException:Errorstartingchild异常的原因及解决方案，重点在于Servlet注解和web.xml配置的正确使用，避免因配置不当导致的Servlet无法找到的问题。

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java.lang.IllegalStateException: Error starting child的处理

先来看一下这个异常

java.lang.IllegalStateException: Error starting child
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:716)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1729)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:457)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:406)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)

因为我的粗心大意导致这个异常我经常遇到，为了不再遇到它，我决定记录一下。
这个异常无非是Servlet上的注解没弄好，要不然就是web.xml文件没配好
如果同时配置了注解和web.xml文件也会报错
分享一下我写的注解

@WebServlet(name ="loginServlet",urlPatterns = "/loginServlet")

往往我总是写成这样,这样也不报错，但就是找不到这个Servlet

@WebServlet(name ="loginServlet")
@WebServlet(name ="/loginServlet")

在配置web.xml文件时一定要加上“/”哦否则也会找不到Servlet地址

<url-pattern>loginServlet</url-pattern>
<url-pattern>/loginServlet</url-pattern>