信息: Server startup in 974 mscom.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.?? ?at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)?? ?at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)?? ?at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)?? ?at java.lang.reflect.Constructor.newInstance(Constructor.java:513)?? ?at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)?? ?at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:988)?? ?at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)?? ?at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2251)?? ?at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)?? ?at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)?? ?at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)?? ?at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)?? ?at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)?? ?at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)?? ?at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)?? ?at java.lang.reflect.Constructor.newInstance(Constructor.java:513)?? ?at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)?? ?at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)?? ?at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)?? ?at java.sql.DriverManager.getConnection(DriverManager.java:582)?? ?at java.sql.DriverManager.getConnection(DriverManager.java:185)?? ?at test.DaoFactory.getConnection(DaoFactory.java:24)?? ?at daoimpl.BookDaoImpl.queryAllbooks(BookDaoImpl.java:26)?? ?at org.apache.jsp.index_jsp._jspService(index_jsp.java:92)?? ?at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)?? ?at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)?? ?at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)?? ?at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)?? ?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)?? ?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)?? ?at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)?? ?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)?? ?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)?? ?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)?? ?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)?? ?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)?? ?at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)?? ?at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)?? ?at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1774)?? ?at java.lang.Thread.run(Thread.java:619)Caused by: java.net.UnknownHostException: localhose?? ?at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)?? ?at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849)?? ?at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200)?? ?at java.net.InetAddress.getAllByName0(InetAddress.java:1153)?? ?at java.net.InetAddress.getAllByName(InetAddress.java:1083)?? ?at java.net.InetAddress.getAllByName(InetAddress.java:1019)?? ?at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:188)?? ?at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)?? ?... 35 morejava.lang.NullPointerException?? ?at daoimpl.BookDaoImpl.queryAllbooks(BookDaoImpl.java:27)?? ?at org.apache.jsp.index_jsp._jspService(index_jsp.java:92)?? ?at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)?? ?at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)?? ?at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)?? ?at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)?? ?at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)?? ?at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)?? ?at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)?? ?at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)?? ?at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)?? ?at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)?? ?at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)?? ?at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)?? ?at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)?? ?at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)?? ?at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1774)?? ?at java.lang.Thread.run(Thread.java:619)