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这错误怎么解决?

0
[已解决问题] 解决于 2018-10-02 21:52

HTTP Status 500 – Internal Server Error
Type Exception Report

Message Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.pojo.System_User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.pojo.System_User.<init>()

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.pojo.System_User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.pojo.System_User.<init>()
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
Root Cause

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.pojo.System_User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.pojo.System_User.<init>()
org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)
com.sun.proxy.$Proxy16.selectOne(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
com.sun.proxy.$Proxy17.query_User(Unknown Source)
com.biz.BIzImpl.LoginBizImpl.query_User(LoginBizImpl.java:19)
com.controller.mainController.Login(mainController.java:30)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:564)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:177)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
Root Cause

org.apache.ibatis.reflection.ReflectionException: Error instantiating class com.pojo.System_User with invalid types () or values (). Cause: java.lang.NoSuchMethodException: com.pojo.System_User.<init>()
org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:86)
org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:48)
org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:41)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:539)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:518)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:334)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:294)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:269)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:239)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:153)
org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:60)
org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:564)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
com.sun.proxy.$Proxy16.selectOne(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
com.sun.proxy.$Proxy17.query_User(Unknown Source)
com.biz.BIzImpl.LoginBizImpl.query_User(LoginBizImpl.java:19)
com.controller.mainController.Login(mainController.java:30)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:564)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:177)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
Root Cause

java.lang.NoSuchMethodException: com.pojo.System_User.<init>()
java.base/java.lang.Class.getConstructor0(Class.java:3302)
java.base/java.lang.Class.getDeclaredConstructor(Class.java:2512)
org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:60)
org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:48)
org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:41)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:539)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:518)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:334)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:294)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:269)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:239)
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:153)
org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:60)
org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:564)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
com.sun.proxy.$Proxy16.selectOne(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)
com.sun.proxy.$Proxy17.query_User(Unknown Source)
com.biz.BIzImpl.LoginBizImpl.query_User(LoginBizImpl.java:19)
com.controller.mainController.Login(mainController.java:30)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:564)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:177)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

玄月白的主页 玄月白 | 初学一级 | 园豆:6
提问于:2018-10-02 00:36
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最佳答案
0

可能是因为缺少默认构造函数

奖励园豆:5
dudu | 高人七级 |园豆:36412 | 2018-10-02 14:14

对的,这个错误我已经解决了,只是,我发现一个问题,Idea中需要两个构造函数,Eclipse只要第一个构造函数这是怎么回事
代码如下
package com.pojo;

public class System_User {
public Long id;
public String name_tc;
public String pwd;

public Long getId() {
    return id;
}

public String getName_tc() {
    return name_tc;
}

public String getPwd() {
    return pwd;
}

public void setId(Long id) {
    this.id = id;
}

public void setName_tc(String name_tc) {
    this.name_tc = name_tc;
}

public void setPwd(String pwd) {
    this.pwd = pwd;
}

public System_User(Long id, String name_tc, String pwd) {
    super();
    this.id = id;
    this.name_tc = name_tc;
    this.pwd = pwd;
}
//和eclipse有区别,没有这个构造函数会报错
public System_User(){}

}

玄月白 | 园豆:6 (初学一级) | 2018-10-02 21:51
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