我极力尝试通过我的java webapp（在同一主机上运行的机器人）以root用户访问Mysql数据库8.0.18（测试环境）。但是，我总是得到以下Stacktrace：
SQLException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[?:?]
at java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[?:?]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:861) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2096) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2021) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[?:?]
at java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[?:?]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at java.sql.DriverManager.getConnection(DriverManager.java:677) ~[java.sql:?]
at java.sql.DriverManager.getConnection(DriverManager.java:189) ~[java.sql:?]
at de.aedsicad.vermunterlagenportal.auftragsverwaltung.DBconnection.openDbConnection(DBconnection.java:108) [onlineadapterservice.jar:6_5_0_0_RC16]
at de.aedsicad.vermunterlagenportal.auftragsverwaltung.AuftragsverwaltungDBOperation.insertNewAuftrag(AuftragsverwaltungDBOperation.java:48) [onlineadapterservice.jar:6_5_0_0_RC16]
at de.aedsicad.vermunterlagenportal.portaladapter.webservice.PortaladapterWebservice.executeJob(PortaladapterWebservice.java:44) [onlineadapterservice.jar:6_5_0_0_RC16]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
at com.sun.xml.ws.util.Trampoline.invoke(MethodUtil.java:82) [?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
at com.sun.xml.ws.util.MethodUtil.invoke(MethodUtil.java:107) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.api.server.MethodUtil.invoke(MethodUtil.java:64) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.api.server.InstanceResolver$1.invoke(InstanceResolver.java:250) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.server.InvokerTube$2.invoke(InvokerTube.java:149) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:88) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:1136) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:1050) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:1019) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:877) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:419) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:868) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:422) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.transport.http.servlet.ServletAdapter.invokeAsync(ServletAdapter.java:225) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doGet(WSServletDelegate.java:161) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doPost(WSServletDelegate.java:197) [jaxws-rt-2.3.0.jar:2.3.0]
at com.sun.xml.ws.transport.http.servlet.WSServlet.doPost(WSServlet.java:81) [jaxws-rt-2.3.0.jar:2.3.0]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) [servlet-api.jar:?]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [servlet-api.jar:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [catalina.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-websocket.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
at de.aedsicad.filters.EncodingFilter.doFilter(EncodingFilter.java:46) [onlineadapterservice.jar:6_5_0_0_RC16]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71) [log4j-web-2.11.0.jar:2.11.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:9.0.27]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:9.0.27]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [catalina.jar:9.0.27]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:9.0.27]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) [catalina.jar:9.0.27]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [catalina.jar:9.0.27]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [catalina.jar:9.0.27]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) [catalina.jar:9.0.27]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [catalina.jar:9.0.27]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [catalina.jar:9.0.27]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-coyote.jar:9.0.27]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:9.0.27]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-coyote.jar:9.0.27]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) [tomcat-coyote.jar:9.0.27]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:9.0.27]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:9.0.27]
at java.lang.Thread.run(Thread.java:830) [?:?]
Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2037) ~[mysql-connector-java-5.1.46.jar:5.1.46]
... 71 more
所以我试图像这样向root用户授予访问权限：
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'mysql' WITH GRANT OPTION;
FLUSH PRIVILEGES;
但是，MySQLWorkbench给我这个错误作为答案：
Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTIFIED BY 'mysql' WITH GRANT OPTION' at line 1
我的陈述有什么问题？我在整个互联网上搜索，对我来说，我可以找到所有的示例和教程？
IDENTIFIED BY子句用于创建用户，并分配密码。 GRANT语句未创建用户。
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;
应该工作。
尽管您的应用程序似乎更有可能为root配置了错误的mysql密码。确保密码正确，或更改root的密码。