Java的線程與進(jìn)程以及線程的四種創(chuàng)建方式
更新時(shí)間：2022年03月15日 15:34:15 作者：羨羨ˇ
這篇文章主要為大家詳細(xì)介紹了Java的線程與進(jìn)程以及線程的四種創(chuàng)建方式，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下，希望能夠給你帶來(lái)幫助
問(wèn)題描述
這里我想測(cè)試某個(gè)與springboot相關(guān)的問(wèn)題，結(jié)果在搭建mybatis時(shí)，發(fā)現(xiàn)沒(méi)有成功從數(shù)據(jù)庫(kù)中獲取數(shù)據(jù)，報(bào)錯(cuò)信息為
com.mysql.cj.exceptions.DataConversionException: Unsupported conversion from LONG to java.sql.Timestamp
我仔細(xì)看了下代碼，沒(méi)啥問(wèn)題。
case 代碼截圖
數(shù)據(jù)庫(kù)DO
我這邊偷懶了。
controller定義
dao定義
mapper實(shí)現(xiàn)
mysql相關(guān) properties配置
數(shù)據(jù)庫(kù)數(shù)據(jù)
測(cè)試結(jié)果
具體錯(cuò)誤信息
2022-03-12 14:49:12.554 ERROR 43360 --- [nio-8088-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: Error attempting to get column '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.Timestamp] with root cause com.mysql.cj.exceptions.DataConversionException: Unsupported conversion from LONG to java.sql.Timestamp at com.mysql.cj.result.DefaultValueFactory.unsupported(DefaultValueFactory.java:70) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.result.DefaultValueFactory.createFromLong(DefaultValueFactory.java:91) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.protocol.a.MysqlTextValueDecoder.decodeInt8(MysqlTextValueDecoder.java:126) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.protocol.result.AbstractResultsetRow.decodeAndCreateReturnValue(AbstractResultsetRow.java:113) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.protocol.result.AbstractResultsetRow.getValueFromBytes(AbstractResultsetRow.java:243) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.protocol.a.result.ByteArrayRow.getValue(ByteArrayRow.java:91) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.jdbc.result.ResultSetImpl.getTimestamp(ResultSetImpl.java:933) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.mysql.cj.jdbc.result.ResultSetImpl.getTimestamp(ResultSetImpl.java:971) ~[mysql-connector-java-8.0.23.jar:8.0.23] at com.zaxxer.hikari.pool.HikariProxyResultSet.getTimestamp(HikariProxyResultSet.java) ~[HikariCP-4.0.3.jar:na] at org.apache.ibatis.type.DateTypeHandler.getNullableResult(DateTypeHandler.java:39) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.type.DateTypeHandler.getNullableResult(DateTypeHandler.java:28) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:85) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createUsingConstructor(DefaultResultSetHandler.java:710) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createByConstructorSignature(DefaultResultSetHandler.java:693) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:657) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:630) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:301) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:194) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:76) ~[mybatis-3.5.6.jar:3.5.6] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_202] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_202] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_202] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_202] at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:427) ~[mybatis-spring-2.0.6.jar:2.0.6] at com.sun.proxy.$Proxy66.selectOne(Unknown Source) ~[na:na] at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:160) ~[mybatis-spring-2.0.6.jar:2.0.6] at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:87) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152) ~[mybatis-3.5.6.jar:3.5.6] at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85) ~[mybatis-3.5.6.jar:3.5.6] at com.sun.proxy.$Proxy67.getById(Unknown Source) ~[na:na] at com.yichen.casetest.controller.JsonController.get(JsonController.java:27) ~[classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_202] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_202] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_202] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_202] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.12.jar:5.3.12] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.12.jar:5.3.12] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.12.jar:5.3.12] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.12.jar:5.3.12] at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.54.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.12.jar:5.3.12] at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.54.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.54.jar:9.0.54] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.12.jar:5.3.12] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.12.jar:5.3.12] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.12.jar:5.3.12] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.12.jar:5.3.12] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.12.jar:5.3.12] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.12.jar:5.3.12] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.54.jar:9.0.54] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.54.jar:9.0.54] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_202]
解決
這個(gè)錯(cuò)誤信息提示，讓我很困惑，我這里完全沒(méi)有Long轉(zhuǎn)timestamp的情況啊。這里的問(wèn)題是因?yàn)?code>resultMap中的type字段沒(méi)有無(wú)參構(gòu)造函數(shù)導(dǎo)致的
之后修改為如下，再次測(cè)試成功
總結(jié)
1、別偷懶，好好地區(qū)分DO和DTO就不會(huì)有這個(gè)問(wèn)題了(一般DO都只有getter()和setter())
2、注意 mybatis dao中反參需要無(wú)參構(gòu)造函數(shù)
3、數(shù)據(jù)庫(kù)中時(shí)間和網(wǎng)頁(yè)時(shí)間不一樣問(wèn)題(1、mapper中定義為Date。2、@JsonFOrmat注解)
本篇文章就到這里了，希望能夠給你帶來(lái)幫助，也希望您能夠多多關(guān)注腳本之家的更多內(nèi)容!
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