数据库查询报错无法创建有效参数 Cannot create Parameters

出现这个报错是因为在User中通常没有添加无参构造函数，只需要在User中添加上

public User() {
}就可以解决。

package com.example.Javaweb.pojo;public class User {private Integer id;private String username;private String password;private String email;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", email='" + email + '\'' +'}';}public User() {}public User(Integer id, String username, String password, String email) {this.id = id;this.username = username;this.password = password;this.email = email;}
}

报错内容如下：

八月 17, 2021 10:36:16 上午 com.alibaba.druid.pool.DruidDataSource info
信息: {dataSource-1} inited
java.sql.SQLException: Cannot create com.example.Javaweb.pojo.User: com.example.Javaweb.pojo.User Query: select `id`,`username`,`password`,`email` from t_user where username = ? Parameters: [admin]
   at org.apache.commons.dbutils.AbstractQueryRunner.rethrow(AbstractQueryRunner.java:527)
   at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:391)
   at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:252)
   at com.example.Javaweb.dao.impl.BaseDao.queryForOne(BaseDao.java:43)
   at com.example.Javaweb.dao.impl.UserDaoImpl.queryUserByUsername(UserDaoImpl.java:8)
   at com.example.Javaweb.dao.impl.UserDaoTest.queryUserByUsername(UserDaoTest.java:12)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:497)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
null
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
   at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
   at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
   at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
   at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
   at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
   at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
   at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
   at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
   at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
   at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)

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