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java.lang.ClassCastException: 	at org.hibernate.dialect.Dialect.getDialect(Dialect.java:518)	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:109)	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1509)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1054)	at hello.db.HibernateUtil.(HibernateUtil.java:15)	at hello.web.HelloAction.execute(HelloAction.java:24)	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)	at java.lang.Thread.run(Thread.java:534)