在使用Spring Boot整合Mybatis的过程中遇到Communications link failure的错误，错误涉及到JDBC连接问题，可能原因在于数据库连接配置。通过删除URL中的特定参数解决了该问题。
报错内容：
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 1,091 milliseconds ago. The last packet sent successfully to the server was 1,087 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_231]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_231]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_231]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_231]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:201) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.MysqlIO.negotiateSSLConnection(MysqlIO.java:4914) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1663) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2199) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2230) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2025) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:778) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_231]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_231]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_231]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_231]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) ~[mysql-connector-java-5.1.47.jar:5.1.47]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:117) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:123) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:365) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:194) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:460) [HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:534) [HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115) [HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) [HikariCP-2.7.9.jar:na]
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:151) [spring-jdbc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115) [spring-jdbc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78) [spring-jdbc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82) [mybatis-spring-1.3.2.jar:1.3.2]
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68) [mybatis-spring-1.3.2.jar:1.3.2]
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:338) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) [mybatis-3.4.6.jar:3.4.6]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_231]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_231]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_231]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_231]
at org.mybatis.spring.SqlSessionTemplate S q l S e s s i o n I n t e r c e p t o r . i n v o k e ( S q l S e s s i o n T e m p l a t e . j a v a : 433 ) [ m y b a t i s − s p r i n g − 1.3.2. j a r : 1.3.2 ] a t c o m . s u n . p r o x y . SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) [mybatis-spring-1.3.2.jar:1.3.2] at com.sun.proxy. SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)[mybatis−spring−1.3.2.jar:1.3.2]atcom.sun.proxy.Proxy60.selectOne(Unknown Source) [na:na]
at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166) [mybatis-spring-1.3.2.jar:1.3.2]
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:83) [mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59) [mybatis-3.4.6.jar:3.4.6]
at com.sun.proxy. P r o x y 61. g e t U s e r s ( U n k n o w n S o u r c e ) [ n a : n a ] a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 ( N a t i v e M e t h o d ) [ n a : 1.8. 0 2 31 ] a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e ( N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 62 ) [ n a : 1.8. 0 2 31 ] a t s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e ( D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43 ) [ n a : 1.8. 0 2 31 ] a t j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e ( M e t h o d . j a v a : 498 ) [ n a : 1.8. 0 2 31 ] a t o r g . s p r i n g f r a m e w o r k . a o p . s u p p o r t . A o p U t i l s . i n v o k e J o i n p o i n t U s i n g R e f l e c t i o n ( A o p U t i l s . j a v a : 343 ) [ s p r i n g − a o p − 5.0.9. R E L E A S E . j a r : 5.0.9. R E L E A S E ] a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . R e f l e c t i v e M e t h o d I n v o c a t i o n . i n v o k e J o i n p o i n t ( R e f l e c t i v e M e t h o d I n v o c a t i o n . j a v a : 197 ) [ s p r i n g − a o p − 5.0.9. R E L E A S E . j a r : 5.0.9. R E L E A S E ] a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . R e f l e c t i v e M e t h o d I n v o c a t i o n . p r o c e e d ( R e f l e c t i v e M e t h o d I n v o c a t i o n . j a v a : 163 ) [ s p r i n g − a o p − 5.0.9. R E L E A S E . j a r : 5.0.9. R E L E A S E ] a t o r g . s p r i n g f r a m e w o r k . d a o . s u p p o r t . P e r s i s t e n c e E x c e p t i o n T r a n s l a t i o n I n t e r c e p t o r . i n v o k e ( P e r s i s t e n c e E x c e p t i o n T r a n s l a t i o n I n t e r c e p t o r . j a v a : 139 ) [ s p r i n g − t x − 5.0.9. R E L E A S E . j a r : 5.0.9. R E L E A S E ] a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . R e f l e c t i v e M e t h o d I n v o c a t i o n . p r o c e e d ( R e f l e c t i v e M e t h o d I n v o c a t i o n . j a v a : 185 ) [ s p r i n g − a o p − 5.0.9. R E L E A S E . j a r : 5.0.9. R E L E A S E ] a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . J d k D y n a m i c A o p P r o x y . i n v o k e ( J d k D y n a m i c A o p P r o x y . j a v a : 212 ) [ s p r i n g − a o p − 5.0.9. R E L E A S E . j a r : 5.0.9. R E L E A S E ] a t c o m . s u n . p r o x y . Proxy61.getUsers(Unknown Source) [na:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_231] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_231] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_231] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_231] at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343) [spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197) [spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) [spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) [spring-tx-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) [spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE] at com.sun.proxy. Proxy61.getUsers(UnknownSource)[na:na]atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod) [na:1.8.0231]atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [na:1.8.0231]atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [na:1.8.0231]atjava.lang.reflect.Method.invoke(Method.java:498) [na:1.8.0231]atorg.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)[spring−aop−5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197)[spring−aop−5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)[spring−aop−5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)[spring−tx−5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)[spring−aop−5.0.9.RELEASE.jar:5.0.9.RELEASE]atorg.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)[spring−aop−5.0.9.RELEASE.jar:5.0.9.RELEASE]atcom.sun.proxy.Proxy63.getUsers(Unknown Source) [na:na]
at com.zxh.service.User_Service.getUsers(User_Service.java:21) [classes/:na]
at com.zxh.controller.User_controller.GetUser(User_controller.java:24) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_231]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_231]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_231]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_231]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.coyote.AbstractProtocol C o n n e c t i o n H a n d l e r . p r o c e s s ( A b s t r a c t P r o t o c o l . j a v a : 806 ) [ t o m c a t − e m b e d − c o r e − 8.5.34. j a r : 8.5.34 ] a t o r g . a p a c h e . t o m c a t . u t i l . n e t . N i o E n d p o i n t ConnectionHandler.process(AbstractProtocol.java:806) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.tomcat.util.net.NioEndpoint ConnectionHandler.process(AbstractProtocol.java:806)[tomcat−embed−core−8.5.34.jar:8.5.34]atorg.apache.tomcat.util.net.NioEndpointSocketProcessor.doRun(NioEndpoint.java:1498) [tomcat-embed-core-8.5.34.jar:8.5.34]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.34.jar:8.5.34]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_231]
at java.util.concurrent.ThreadPoolExecutor W o r k e r . r u n ( T h r e a d P o o l E x e c u t o r . j a v a : 624 ) [ n a : 1.8. 0 2 31 ] a t o r g . a p a c h e . t o m c a t . u t i l . t h r e a d s . T a s k T h r e a d Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_231] at org.apache.tomcat.util.threads.TaskThread Worker.run(ThreadPoolExecutor.java:624)[na:1.8.0231]atorg.apache.tomcat.util.threads.TaskThreadWrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.34.jar:8.5.34]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_231]
Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192) ~[na:1.8.0_231]
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1946) ~[na:1.8.0_231]
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:316) ~[na:1.8.0_231]
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:310) ~[na:1.8.0_231]
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1640) ~[na:1.8.0_231]
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:223) ~[na:1.8.0_231]
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1037) ~[na:1.8.0_231]
at sun.security.ssl.Handshaker.process_record(Handshaker.java:965) ~[na:1.8.0_231]
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1064) ~[na:1.8.0_231]
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367) ~[na:1.8.0_231]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395) ~[na:1.8.0_231]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379) ~[na:1.8.0_231]
at com.mysql.jdbc.ExportControlled.transformSocketToSSLSocket(ExportControlled.java:186) ~[mysql-connector-java-5.1.47.jar:5.1.47]
… 115 common frames omitted
Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors
at com.mysql.jdbc.ExportControlled X 509 T r u s t M a n a g e r W r a p p e r . c h e c k S e r v e r T r u s t e d ( E x p o r t C o n t r o l l e d . j a v a : 302 ) [ m y s q l − c o n n e c t o r − j a v a − 5.1.47. j a r : 5.1.47 ] a t s u n . s e c u r i t y . s s l . A b s t r a c t T r u s t M a n a g e r W r a p p e r . c h e c k S e r v e r T r u s t e d ( S S L C o n t e x t I m p l . j a v a : 1099 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . C l i e n t H a n d s h a k e r . s e r v e r C e r t i f i c a t e ( C l i e n t H a n d s h a k e r . j a v a : 1622 ) [ n a : 1.8. 0 2 31 ] . . . 123 c o m m o n f r a m e s o m i t t e d C a u s e d b y : j a v a . s e c u r i t y . c e r t . C e r t P a t h V a l i d a t o r E x c e p t i o n : P a t h d o e s n o t c h a i n w i t h a n y o f t h e t r u s t a n c h o r s a t s u n . s e c u r i t y . p r o v i d e r . c e r t p a t h . P K I X C e r t P a t h V a l i d a t o r . v a l i d a t e ( P K I X C e r t P a t h V a l i d a t o r . j a v a : 159 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . p r o v i d e r . c e r t p a t h . P K I X C e r t P a t h V a l i d a t o r . e n g i n e V a l i d a t e ( P K I X C e r t P a t h V a l i d a t o r . j a v a : 85 ) [ n a : 1.8. 0 2 31 ] a t j a v a . s e c u r i t y . c e r t . C e r t P a t h V a l i d a t o r . v a l i d a t e ( C e r t P a t h V a l i d a t o r . j a v a : 292 ) [ n a : 1.8. 0 2 31 ] a t c o m . m y s q l . j d b c . E x p o r t C o n t r o l l e d X509TrustManagerWrapper.checkServerTrusted(ExportControlled.java:302) ~[mysql-connector-java-5.1.47.jar:5.1.47] at sun.security.ssl.AbstractTrustManagerWrapper.checkServerTrusted(SSLContextImpl.java:1099) ~[na:1.8.0_231] at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1622) ~[na:1.8.0_231] ... 123 common frames omitted Caused by: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors at sun.security.provider.certpath.PKIXCertPathValidator.validate(PKIXCertPathValidator.java:159) ~[na:1.8.0_231] at sun.security.provider.certpath.PKIXCertPathValidator.engineValidate(PKIXCertPathValidator.java:85) ~[na:1.8.0_231] at java.security.cert.CertPathValidator.validate(CertPathValidator.java:292) ~[na:1.8.0_231] at com.mysql.jdbc.ExportControlled X509TrustManagerWrapper.checkServerTrusted(ExportControlled.java:302) [mysql−connector−java−5.1.47.jar:5.1.47]atsun.security.ssl.AbstractTrustManagerWrapper.checkServerTrusted(SSLContextImpl.java:1099) [na:1.8.0231]atsun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1622) [na:1.8.0231]...123commonframesomittedCausedby:java.security.cert.CertPathValidatorException:Pathdoesnotchainwithanyofthetrustanchorsatsun.security.provider.certpath.PKIXCertPathValidator.validate(PKIXCertPathValidator.java:159) [na:1.8.0231]atsun.security.provider.certpath.PKIXCertPathValidator.engineValidate(PKIXCertPathValidator.java:85) [na:1.8.0231]atjava.security.cert.CertPathValidator.validate(CertPathValidator.java:292) [na:1.8.0231]atcom.mysql.jdbc.ExportControlledX509TrustManagerWrapper.checkServerTrusted(ExportControlled.java:295) ~[mysql-connector-java-5.1.47.jar:5.1.47]
… 125 common frames omitted
2020-01-16 13:55:01.380 ERROR 5736 — [nio-8085-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.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 1,091 milliseconds ago. The last packet sent successfully to the server was 1,087 milliseconds ago.
The error may exist in file [C:\Users\ASUS\Desktop\新建文件夹 (2)\target\classes\mapper\User.xml]
The error may involve com.zxh.mapper.User_Mapper.getUsers
The error occurred while executing a query
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 1,091 milliseconds ago. The last packet sent successfully to the server was 1,087 milliseconds ago.] with root cause
java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors
at sun.security.provider.certpath.PKIXCertPathValidator.validate(PKIXCertPathValidator.java:159) ~[na:1.8.0_231]
at sun.security.provider.certpath.PKIXCertPathValidator.engineValidate(PKIXCertPathValidator.java:85) ~[na:1.8.0_231]
at java.security.cert.CertPathValidator.validate(CertPathValidator.java:292) ~[na:1.8.0_231]
at com.mysql.jdbc.ExportControlled X 509 T r u s t M a n a g e r W r a p p e r . c h e c k S e r v e r T r u s t e d ( E x p o r t C o n t r o l l e d . j a v a : 295 ) [ m y s q l − c o n n e c t o r − j a v a − 5.1.47. j a r : 5.1.47 ] a t s u n . s e c u r i t y . s s l . A b s t r a c t T r u s t M a n a g e r W r a p p e r . c h e c k S e r v e r T r u s t e d ( S S L C o n t e x t I m p l . j a v a : 1099 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . C l i e n t H a n d s h a k e r . s e r v e r C e r t i f i c a t e ( C l i e n t H a n d s h a k e r . j a v a : 1622 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . C l i e n t H a n d s h a k e r . p r o c e s s M e s s a g e ( C l i e n t H a n d s h a k e r . j a v a : 223 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . H a n d s h a k e r . p r o c e s s L o o p ( H a n d s h a k e r . j a v a : 1037 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . H a n d s h a k e r . p r o c e s s r e c o r d ( H a n d s h a k e r . j a v a : 965 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . S S L S o c k e t I m p l . r e a d R e c o r d ( S S L S o c k e t I m p l . j a v a : 1064 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . S S L S o c k e t I m p l . p e r f o r m I n i t i a l H a n d s h a k e ( S S L S o c k e t I m p l . j a v a : 1367 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . S S L S o c k e t I m p l . s t a r t H a n d s h a k e ( S S L S o c k e t I m p l . j a v a : 1395 ) [ n a : 1.8. 0 2 31 ] a t s u n . s e c u r i t y . s s l . S S L S o c k e t I m p l . s t a r t H a n d s h a k e ( S S L S o c k e t I m p l . j a v a : 1379 ) [ n a : 1.8. 0 2 31 ] a t c o m . m y s q l . j d b c . E x p o r t C o n t r o l l e d . t r a n s f o r m S o c k e t T o S S L S o c k e t ( E x p o r t C o n t r o l l e d . j a v a : 186 ) [ m y s q l − c o n n e c t o r − j a v a − 5.1.47. j a r : 5.1.47 ] a t c o m . m y s q l . j d b c . M y s q l I O . n e g o t i a t e S S L C o n n e c t i o n ( M y s q l I O . j a v a : 4914 ) [ m y s q l − c o n n e c t o r − j a v a − 5.1.47. j a r : 5.1.47 ] a t c o m . m y s q l . j d b c . M y s q l I O . p r o c e e d H a n d s h a k e W i t h P l u g g a b l e A u t h e n t i c a t i o n ( M y s q l I
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