数据库连接池创建失败，提示Datasource[name=dao, Driver=null] created.

[guoxuhui]

首次安装后，提示连接失败，查看日志提示Unable to create initial connections of pool. Datasource[name=dao, Driver=null] created.

但是数据库配置文件是没错的 <Datasource name="dao" userName="root" password="123456" connectionUrl="jdbc:mysql://127.0.0.1:3306/CodeGen" driverClassName="com.mysql.jdbc.Driver"/>

[wangyenan]

能否贴一下相关的堆栈信息，还有，JDK版本，Tomcat版本是多少？

[hejiehui]

你是哪个版本的dal-client?要不你到qq群307228594里面来，我们帮你看看

[guoxuhui]

jdk1.7 tomcat7 与 jdk1.8 tomcat8 都测试过，不行

`[ INFO][12-20 20:05:56.900][http-bio-8080-exec-1][DAL Java Client 1.14.0:74]-Successfully initialized Dal Java Client Factory [ INFO][12-20 20:05:57.010][http-bio-8080-exec-1][DAL Java Client 1.14.0:197]-start request [ INFO][12-20 20:05:57.012][http-bio-8080-exec-1][DAL Java Client 1.14.0:31]-Start Task: N/A [ INFO][12-20 20:05:57.017][http-bio-8080-exec-1][com.ctrip.platform.dal.dao.datasource.SingleDataSource:51]-Datasource[name=dao, Driver=null] created. [ INFO][12-20 20:05:57.112][http-bio-8080-exec-1][com.ctrip.platform.dal.dao.datasource.SingleDataSource:56]-Datasource[name=dao, Driver=null] created. Dec 20, 2017 8:05:57 PM org.apache.tomcat.jdbc.pool.ConnectionPool init 严重: Unable to create initial connections of pool. java.sql.SQLException at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254) at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:727) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:661) at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:479) at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:156) at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116) at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103) at com.ctrip.platform.dal.dao.datasource.SingleDataSource.(SingleDataSource.java:57) at com.ctrip.platform.dal.dao.datasource.RefreshableDataSource.(RefreshableDataSource.java:19) at com.ctrip.platform.dal.dao.datasource.DataSourceLocator.createDataSource(DataSourceLocator.java:73) at com.ctrip.platform.dal.dao.datasource.DataSourceLocator.getDataSource(DataSourceLocator.java:56) at com.ctrip.platform.dal.dao.datasource.DefaultDalConnectionLocator.getConnection(DefaultDalConnectionLocator.java:36) at com.ctrip.platform.dal.dao.client.DalConnectionManager.getConnectionFromDSLocator(DalConnectionManager.java:120) at com.ctrip.platform.dal.dao.client.DalConnectionManager.getNewConnection(DalConnectionManager.java:54) at com.ctrip.platform.dal.dao.client.DalTransactionManager.getConnection(DalTransactionManager.java:112) at com.ctrip.platform.dal.dao.client.DalTransactionManager.getConnection(DalTransactionManager.java:87) at com.ctrip.platform.dal.dao.client.DalDirectClient.getConnection(DalDirectClient.java:425) at com.ctrip.platform.dal.dao.client.DalDirectClient$1.execute(DalDirectClient.java:55) at com.ctrip.platform.dal.dao.client.DalConnectionManager._doInConnection(DalConnectionManager.java:157) at com.ctrip.platform.dal.dao.client.DalConnectionManager.doInConnection(DalConnectionManager.java:134) at com.ctrip.platform.dal.dao.client.DalDirectClient.doInConnection(DalDirectClient.java:413) at com.ctrip.platform.dal.dao.client.DalDirectClient.query(DalDirectClient.java:76) at com.ctrip.platform.dal.dao.task.QuerySqlTask.execute(QuerySqlTask.java:19) at com.ctrip.platform.dal.dao.task.DalSqlTaskRequest$SqlTaskCallable.call(DalSqlTaskRequest.java:170) at com.ctrip.platform.dal.dao.task.RequestTaskWrapper.call(RequestTaskWrapper.java:33) at com.ctrip.platform.dal.dao.task.DalRequestExecutor.nonCrossShardExecute(DalRequestExecutor.java:133) at com.ctrip.platform.dal.dao.task.DalRequestExecutor.internalExecute(DalRequestExecutor.java:113) at com.ctrip.platform.dal.dao.task.DalRequestExecutor.execute(DalRequestExecutor.java:98) at com.ctrip.platform.dal.dao.DalQueryDao.query(DalQueryDao.java:132) at com.ctrip.platform.dal.daogen.dao.DaoOfLoginUser.getUserByNo(DaoOfLoginUser.java:46) at com.ctrip.platform.dal.daogen.entity.DefaultUserInfo.getLoginUser(DefaultUserInfo.java:23) at com.ctrip.platform.dal.daogen.entity.DefaultUserInfo.getEmployee(DefaultUserInfo.java:29) at com.ctrip.platform.dal.daogen.resource.CustomizedResource.getEmployee(CustomizedResource.java:82) at com.ctrip.platform.dal.daogen.filter.UserFilter.doFilter(UserFilter.java:30) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246) ... 51 more

[ERROR][12-20 20:05:57.143][http-bio-8080-exec-1][com.ctrip.platform.dal.dao.datasource.SingleDataSource:60]-Error creating pool for data source dao java.sql.SQLException: null at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254) at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:727) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:661) at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:479) at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:156) at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116) at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103) at com.ctrip.platform.dal.dao.datasource.SingleDataSource.(SingleDataSource.java:57) at com.ctrip.platform.dal.dao.datasource.RefreshableDataSource.(RefreshableDataSource.java:19) at com.ctrip.platform.dal.dao.datasource.DataSourceLocator.createDataSource(DataSourceLocator.java:73) at com.ctrip.platform.dal.dao.datasource.DataSourceLocator.getDataSource(DataSourceLocator.java:56) at com.ctrip.platform.dal.dao.datasource.DefaultDalConnectionLocator.getConnection(DefaultDalConnectionLocator.java:36) at com.ctrip.platform.dal.dao.client.DalConnectionManager.getConnectionFromDSLocator(DalConnectionManager.java:120) at com.ctrip.platform.dal.dao.client.DalConnectionManager.getNewConnection(DalConnectionManager.java:54) at com.ctrip.platform.dal.dao.client.DalTransactionManager.getConnection(DalTransactionManager.java:112) at com.ctrip.platform.dal.dao.client.DalTransactionManager.getConnection(DalTransactionManager.java:87) at com.ctrip.platform.dal.dao.client.DalDirectClient.getConnection(DalDirectClient.java:425) at com.ctrip.platform.dal.dao.client.DalDirectClient$1.execute(DalDirectClient.java:55) at com.ctrip.platform.dal.dao.client.DalConnectionManager._doInConnection(DalConnectionManager.java:157) at com.ctrip.platform.dal.dao.client.DalConnectionManager.doInConnection(DalConnectionManager.java:134) at com.ctrip.platform.dal.dao.client.DalDirectClient.doInConnection(DalDirectClient.java:413) at com.ctrip.platform.dal.dao.client.DalDirectClient.query(DalDirectClient.java:76) at com.ctrip.platform.dal.dao.task.QuerySqlTask.execute(QuerySqlTask.java:19) at com.ctrip.platform.dal.dao.task.DalSqlTaskRequest$SqlTaskCallable.call(DalSqlTaskRequest.java:170) at com.ctrip.platform.dal.dao.task.RequestTaskWrapper.call(RequestTaskWrapper.java:33) at com.ctrip.platform.dal.dao.task.DalRequestExecutor.nonCrossShardExecute(DalRequestExecutor.java:133) at com.ctrip.platform.dal.dao.task.DalRequestExecutor.internalExecute(DalRequestExecutor.java:113) at com.ctrip.platform.dal.dao.task.DalRequestExecutor.execute(DalRequestExecutor.java:98) at com.ctrip.platform.dal.dao.DalQueryDao.query(DalQueryDao.java:132) at com.ctrip.platform.dal.daogen.dao.DaoOfLoginUser.getUserByNo(DaoOfLoginUser.java:46) at com.ctrip.platform.dal.daogen.entity.DefaultUserInfo.getLoginUser(DefaultUserInfo.java:23) at com.ctrip.platform.dal.daogen.entity.DefaultUserInfo.getEmployee(DefaultUserInfo.java:29) at com.ctrip.platform.dal.daogen.resource.CustomizedResource.getEmployee(CustomizedResource.java:82) at com.ctrip.platform.dal.daogen.filter.UserFilter.doFilter(UserFilter.java:30) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException: null at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246) ... 51 common frames omitted Dec 20, 2017 8:05:57 PM org.apache.tomcat.jdbc.pool.ConnectionPool init 严重: Unable to create initial connections of pool.`

[hejiehui]

这个是1.14.0的bug。没有对基于datasource.xml的数据库连接配置做支持。我们后面会发个1.14.1来fix这个issue。目前可以用外部properties文件的方式继续使用1.14.0或切换到1.13.x

[skilyxx]

您好，试了一下1.14.1还是有这个问题。 PoolProperties里参数是空的，导致了后面解析jdbc字符串的时候报错反射找不到mysql类。

信息: Server startup in 2786 ms [ INFO][01-16 10:32:48.180][http-bio-8000-exec-1][com.ctrip.platform.dal.dao.configure.DataSourceConfigureParser:51]-datasource property will use file :/home/yeon/env/tomcat/apache-tomcat-7.0.61/webapps/ROOT/WEB-INF/classes/datasource.xml [ INFO][01-16 10:32:48.186][http-bio-8000-exec-1][DAL Java Client 1.14.1:74]-Successfully initialized Dal Java Client Factory [ INFO][01-16 10:32:48.209][http-bio-8000-exec-1][com.ctrip.platform.dal.dao.datasource.SingleDataSource:54]-pool properties: ConnectionPool[defaultAutoCommit=null; defaultReadOnly=null; defaultTransactionIsolation=-1; defaultCatalog=null; driverClassName=null; maxActive=100; maxIdle=100; minIdle=0; initialSize=1; maxWait=10000; testOnBorrow=true; testOnReturn=false; timeBetweenEvictionRunsMillis=5000; numTestsPerEvictionRun=0; minEvictableIdleTimeMillis=30000; testWhileIdle=false; testOnConnect=false; password=****; url=null; username=null; validationQuery=SELECT 1; validationQueryTimeout=5; validatorClassName=com.ctrip.platform.dal.dao.datasource.DataSourceValidator; validationInterval=30000; accessToUnderlyingConnectionAllowed=true; removeAbandoned=true; removeAbandonedTimeout=65; logAbandoned=false; connectionProperties=null; initSQL=null; jdbcInterceptors=org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer; jmxEnabled=true; fairQueue=true; useEquals=true; abandonWhenPercentageFull=0; maxAge=28000000; useLock=false; dataSource=null; dataSourceJNDI=null; suspectTimeout=0; alternateUsernameAllowed=false; commitOnReturn=false; rollbackOnReturn=false; useDisposableConnectionFacade=true; logValidationErrors=false; propagateInterruptState=false; ignoreExceptionOnPreLoad=false; [ INFO][01-16 10:32:48.210][http-bio-8000-exec-1][com.ctrip.platform.dal.dao.datasource.SingleDataSource:57]-Prepare Datasource[name=dao, Driver=null] 一月 16, 2018 10:32:48 上午 org.apache.tomcat.jdbc.pool.ConnectionPool init 严重: Unable to create initial connections of pool. java.sql.SQLException at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254) at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:727) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:661) at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:479) at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:156) at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116) at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103) at com.ctrip.platform.dal.dao.datasource.SingleDataSource.(SingleDataSource.java:58) at com.ctrip.platform.dal.dao.datasource.RefreshableDataSource.(RefreshableDataSource.java:22) at com.ctrip.platform.dal.dao.datasource.DataSourceLocator.createDataSource(DataSourceLocator.java:80) at com.ctrip.platform.dal.dao.datasource.DataSourceLocator.getDataSource(DataSourceLocator.java:59) at com.ctrip.platform.dal.dao.datasource.DefaultDalConnectionLocator.getConnection(DefaultDalConnectionLocator.java:38) at com.ctrip.platform.dal.dao.client.DalConnectionManager.getConnectionFromDSLocator(DalConnectionManager.java:120) at com.ctrip.platform.dal.dao.client.DalConnectionManager.getNewConnection(DalConnectionManager.java:54) at com.ctrip.platform.dal.dao.client.DalTransactionManager.getConnection(DalTransactionManager.java:112) at com.ctrip.platform.dal.dao.client.DalTransactionManager.startTransaction(DalTransactionManager.java:34) at com.ctrip.platform.dal.dao.client.DalTransactionManager.doInTransaction(DalTransactionManager.java:150) at com.ctrip.platform.dal.dao.client.DalDirectClient.doInTransaction(DalDirectClient.java:418) at com.ctrip.platform.dal.dao.client.DalDirectClient.executeBatch(DalDirectClient.java:407) at com.ctrip.platform.dal.dao.client.DalDirectClient.batchUpdate(DalDirectClient.java:177) at com.ctrip.platform.dal.daogen.dao.SetupDBDao.executeSqlScript(SetupDBDao.java:25) at com.ctrip.platform.dal.daogen.resource.SetupDBResource.setupTables(SetupDBResource.java:376) at com.ctrip.platform.dal.daogen.resource.SetupDBResource.initializeDb(SetupDBResource.java:185) 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.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:205) at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) at org.glassfish.jersey.internal.Errors.process(Errors.java:315) at org.glassfish.jersey.internal.Errors.process(Errors.java:297) at org.glassfish.jersey.internal.Errors.process(Errors.java:267) at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.ctrip.platform.dal.daogen.filter.UserFilter.doFilter(UserFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NullPointerException at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246) ... 72 more

[skilyxx]

换了1.13.1，正常。

[wangyenan]

我们已经更新到最新的1.14.2版本，本地test case通过，你再试一下，如果仍旧不行，加我们的QQ群，我们帮你看一下是哪里的配置问题。

[ShawyerPeng]

我首先也出现这样的错误，然后加了mysql-connector-java包，就OK啦