`A `A]root cause [/b]

net.sf.hibernate.JDBCException: Cannot open connection
net.sf.hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:281)
net.sf.hibernate.impl.SessionImpl.connect(SessionImpl.java:3264)
net.sf.hibernate.impl.SessionImpl.connection(SessionImpl.java:3244)
net.sf.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:40)
net.sf.hibernate.transaction.JDBCTransactionFactory.beginTransaction(JDBCTransactionFactory.java:19)
net.sf.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:2195)
com.bOS.bPRO_PersonManage.service.UsersDao.logonUsers(UsersDao.java:78)
com.bOS.bPRO_PersonManage.action.UsersAction.logon(UsersAction.java:111)
com.bOS.bPRO_PersonManage.action.UsersAction.execute(UsersAction.java:41)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
com.bOS.Action.ActionServlet.process(ActionServlet.java:21)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

不知如何解决

这个错误是数据库连接的错误，请按照说明书上仔细检查数据库配置和环境配置是否正确