Cause java.sql.SQLDataException Unsupported conversion from LONG to java.sql.Timestamp

今天遇到了一个奇怪的错误，报错如下图所示：

org.springframework.dao.DataIntegrityViolationException: Error attempting to get column 'question_id' from result set.  Cause: java.sql.SQLDataException: Unsupported conversion from LONG to java.sql.Timestamp
; Unsupported conversion from LONG to java.sql.Timestamp; nested exception is java.sql.SQLDataException: Unsupported conversion from LONG to java.sql.Timestampat org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:84)at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:88)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)at com.sun.proxy.$Proxy140.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:223)at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForMany(MybatisMapperMethod.java:177)at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:78)at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:96)at com.sun.proxy.$Proxy153.selectList(Unknown Source)at cn.tedu.straw.portal.test.mapper.TestTeacherQuestionMapper.selectOne(TestTeacherQuestionMapper.java:32)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:498)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.sql.SQLDataException: Unsupported conversion from LONG to java.sql.Timestampat com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:114)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:96)at com.mysql.cj.jdbc.result.ResultSetImpl.getTimestamp(ResultSetImpl.java:903)at com.mysql.cj.jdbc.result.ResultSetImpl.getTimestamp(ResultSetImpl.java:948)at com.zaxxer.hikari.pool.HikariProxyResultSet.getTimestamp(HikariProxyResultSet.java)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:498)at org.apache.ibatis.logging.jdbc.ResultSetLogger.invoke(ResultSetLogger.java:69)at com.sun.proxy.$Proxy248.getTimestamp(Unknown Source)at org.apache.ibatis.type.DateTypeHandler.getNullableResult(DateTypeHandler.java:39)at org.apache.ibatis.type.DateTypeHandler.getNullableResult(DateTypeHandler.java:28)at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:81)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createUsingConstructor(DefaultResultSetHandler.java:671)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createByConstructorSignature(DefaultResultSetHandler.java:654)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:618)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:591)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:301)at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:194)at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65)at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)at com.sun.proxy.$Proxy236.query(Unknown Source)at com.baomidou.mybatisplus.core.executor.MybatisSimpleExecutor.doQuery(MybatisSimpleExecutor.java:67)at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.query(MybatisCachingExecutor.java:155)at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy235.query(Unknown Source)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)... 37 more

实体类：

@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("teacher_question")
@ApiModel(value="TeacherQuestion对象", description="")
public class TeacherQuestion implements Serializable {private static final long serialVersionUID = 1L;@TableId(value = "id", type = IdType.AUTO)private Integer id;@TableField("teacher_id")private Integer teacherId;@TableField("question_id")private Integer questionId;@TableField("createtime")private Date createtime;public TeacherQuestion(Integer teacherId, Integer questionId, Date createtime) {this.teacherId = teacherId;this.questionId = questionId;this.createtime = createtime;}
}

mapper类和mapper文件如下：

public interface TeacherQuestionMapper extends BaseMapper<TeacherQuestion> {}<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.tedu.straw.portal.mapper.TeacherQuestionMapper"><!-- 通用查询映射结果 --><resultMap id="BaseResultMap" type="cn.tedu.straw.portal.model.TeacherQuestion"><id column="id" property="id" /><result column="teacher_id" property="teacherId" /><result column="question_id" property="questionId" /><result column="createtime" property="createtime" /></resultMap></mapper>

数据库表如下：

测试类如下：

@SpringBootTest(classes = StrawPortalApplication.class)
@RunWith(SpringRunner.class)
public class TestTeacherQuestionMapper {@Resourceprivate TeacherQuestionMapper teacherQuestionMapper;@Testpublic void selectOne(){QueryWrapper queryWrapper=new QueryWrapper();queryWrapper.eq("teacher_id",4);queryWrapper.eq("question_id",44);List<TeacherQuestion> teacherQuestions = teacherQuestionMapper.selectList(queryWrapper);System.out.println(teacherQuestions);}}

反复测试了好多次，不管什么测试条件都是报Cause: java.sql.SQLDataException: Unsupported conversion from LONG to java.sql.Timestamp错误。

后来才想起来自己在实体类里加了一个带参数的构造方法：

 public TeacherQuestion(Integer teacherId, Integer questionId, Date createtime) {this.teacherId = teacherId;this.questionId = questionId;this.createtime = createtime;}

这样就导致该实体类没有无参构造方法了，众所周知，一旦我们手动添加了带参数的构造方法，编译器就不会给我们添加默认的无参构造方法。导致mybatis无法new这个实体类。也就无法做映射。

解决的办法是：给该实体类手动添加一个无参构造方法。

 public TeacherQuestion() {}

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