Tomcat 报异常org.apache.catalina.core.standardwrappervalve invoke

本文档记录了在使用 SpringMVC 过程中遇到的问题,特别是关于依赖注入的注意事项。指出在 Spring 依赖注入环境下,所有上下层类不能直接 new,而必须通过依赖注入的方式调用,否则会引发空指针异常。

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关于应用Spring mvc应用遇到问题的笔记,方便自己以后查看。

Spring 依赖注入后,所有上下层类都不能new 只能以注入方式调用,否则会产生类为空,报空指针错误和题目的异常

08-Jun-2025 20:19:08.482 严重 [http-nio-8080-exec-7] org.apache.catalina.core.StandardWrapperValve.invoke路径为/delivery_system_war_exploded的上下文中Servlet[com.atguigu.servlet.UserServlet]的Servlet.service()引发了具有根本原因的异常Servlet执行抛出一个异常 java.lang.ClassNotFoundException: com.alibaba.druid.pool.DruidDataSourceFactory at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1437) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1245) at com.atguigu.util.JdbcUtilsFinal.<clinit>(JdbcUtilsFinal.java:27) at com.atguigu.dao.BaseDAO.queryValue(BaseDAO.java:92) at com.atguigu.dao.UserDAOImpl.checkUsername(UserDAOImpl.java:15) at com.atguigu.service.UserServiceImpl.checkUsername(UserServiceImpl.java:17) at com.atguigu.servlet.UserServlet.service(UserServlet.java:21) at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:631) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:676) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
06-09
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/electric_data?useSSL=false&characterEncoding=UTF-8 at java.sql.DriverManager.getConnection(DriverManager.java:689) at java.sql.DriverManager.getConnection(DriverManager.java:247) at com.electric.web.servlet.UploadStaticServlet.doPost(UploadStaticServlet.java:90) at javax.servlet.http.HttpServlet.service(HttpServlet.java:555) at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:199) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144) at com.electric.filter.CrosFilter.doFilter(CrosFilter.java:31) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:656) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) at org.apache.coyote.Abstract
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06-12
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