ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component解决
第一:先确定一下开发流程是否正确
1.写好servlet组件类
2.写好web.xml文件--向服务器介绍组件
3.发布--就是拷贝
注意:要拷贝包结构,不要只拷贝组件类文件
另外,拷贝的是.class文件,不是.java文件。
4.启动Tomcat服务器
如果流程正确还是如标题的问题,那就是web.xml肯定有问题
结构如下:
<?xml version="1.0" encoding="ISO-8859-1"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"
metadata-complete="true"> <servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.felix.servlet.HelloServlet</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping> </web-app>
其中出下面的部分外,其他部分可以从Tomcat服务器提供的web应用的例程中的web.xml直接拷贝。
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.felix.servlet.HelloServlet</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
可能的错误原因:
1.servlet servlet-name servlet-class servlet-mapping url-pattern 有拼写错误
2.servlet-class路径有问题
3.url-pattern过滤器中缺少/
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