org.hibernate.exception.JDBCConnectionException：无法打开连接

Question

异常跟踪：

org.hibernate.exception.JDBCConnectionException: Cannot open connection 
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:99) 
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52) 
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449) 
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) 
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160) 
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81) 
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473) 
at com.jwt.hibernate.dao.UserDAO.addUserDetails(UserDAO.java:27) 
at com.jwt.hibernate.controller.UserControllerServlet.doPost(UserControllerServlet.java:29) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
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 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:504) 
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:421) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: java.sql.SQLException: No suitable driver found for jdbc:sqlserver://localhost:1433;databaseName=sagar 
at java.sql.DriverManager.getConnection(DriverManager.java:689) 
at java.sql.DriverManager.getConnection(DriverManager.java:208) 
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133) 
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446) 
... 28 more 

Answer 1

No suitable driver found for jdbc:sqlserver://localhost:1433;databaseName=sagar 

从你的例外，我看到你没有在你的类路径JDBC驱动程序的jar。下载SQL JDBC jar并将其放置在你的类路径中。

Answer 2

，而你的问题（或缺乏）被认为是目前还不清楚，我会尽力帮助：

如果你是在本地环境中开发，你应该下载JDBC驱动程序罐子，在你的类路径添加它。

如果您正在开发远程服务器环境，除了将驱动程序添加到类路径之外，还应将驱动程序放在项目的WebContent/Web-Inf/bin /文件夹中。

这些步骤后，你应该能够克服这个例外。 祝你好运。