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  • HTTP Status 500 java.lang.NoClassDefFoundError: org/springframework/jdbc/core/RowMapper_

    org.springframework.beans.BeanInstantiationException: Failed to instantiate [demo.Words]:
    No default constructor found; nested exception is java.lang.NoSuchMethodException: demo.Words.<init>()
    或者是:

    org.springframework.beans.BeanInstantiationException: Failed to instantiate [Daomain.User]: Is it an abstract class?; nested exception is java.lang.InstantiationException: Daomain.User

     

    这个异常就是实体类的构造函数引起的  

    解决方法:

    要么不设置构造函数;

    要么设置满参构造函数和空参函构造数;..

    javax.servlet.ServletException: Servlet execution threw an exception org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

    root cause

    java.lang.NoClassDefFoundError: org/springframework/jdbc/core/RowMapper
    	AjaxTest.doGet(AjaxTest.java:23)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    这个是因为实体类字段跟数据库类型不一致造成的,把实体类类型改成跟数据库类型一样就好了 .


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  • 原文地址:https://www.cnblogs.com/mljqqh/p/9833563.html
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