servlet异常处理(error instantiating servlet)

在学习SpringMVC时经常会因为搭建环境而出错，找半天找不到问题，简直是脑溢血

在学习SpringMVC的请求参数-基本参数的时候出现异常

javax.servlet.ServletException: Servlet[DispatcherServlet]的Servlet.init（）引发异常
	org.apache.catalina.authenticator.Authenticatorbase.invoke(Authenticatorbase.java:544)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1651)
org.apache.tomcat.util.net.SocketProcessorbase.run(SocketProcessorbase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:832)

之后进行了环境和配置的重新的搭建代码如下：

还有就是pom文件下的依赖包不能少

 
        
            mysql
            mysql-connector-java
            5.1.32
        
        
            c3p0
            c3p0
            0.9.1.2
        
        
            com.alibaba
            druid
            1.1.10
        
        
            junit
            junit
            4.12
            test
        
        
            org.springframework
            spring-context
            5.0.5.RELEASE
        
        
            org.springframework
            spring-test
            5.0.5.RELEASE
        
        
            org.springframework
            spring-web
            5.0.5.RELEASE
        
        
            org.springframework
            spring-webmvc
            5.0.5.RELEASE
        
        
            javax.servlet
            javax.servlet-api
            3.0.1
            provided
        
        
            javax.servlet.jsp
            javax.servlet.jsp-api
            2.2.1
            provided
        
        
            com.fasterxml.jackson.core
            jackson-core
            2.9.0
        
        
            com.fasterxml.jackson.core
            jackson-databind
            2.9.0
        
        
            com.fasterxml.jackson.core
            jackson-annotations
            2.9.0
        
        
            commons-fileupload
            commons-fileupload
            1.3.1
        
        
            commons-io
            commons-io
            2.3
        
    

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