我这个工程编译没错，但是操作页面的时候就报下面的错误，请大家给点意见！
java.sql.SQLException:   [Microsoft][SQLServer   2000   Driver   for   JDBC]Error   establishing   socket.
at   com.microsoft.jdbc.base.BaseExceptions.createException(Unknown   Source)
at   com.microsoft.jdbc.base.BaseExceptions.getException(Unknown   Source)
at   com.microsoft.jdbc.base.BaseExceptions.getException(Unknown   Source)
at   com.microsoft.jdbc.sqlserver.tds.TDSConnection. <init> (Unknown   Source)
at   com.microsoft.jdbc.sqlserver.SQLServerImplConnection.open(Unknown   Source)
at   com.microsoft.jdbc.base.BaseConnection.getNewImplConnection(Unknown   Source)
at   com.microsoft.jdbc.base.BaseConnection.open(Unknown   Source)
at   com.microsoft.jdbc.base.BaseDriver.connect(Unknown   Source)
at   java.sql.DriverManager.getConnection(DriverManager.java:525)
at   java.sql.DriverManager.getConnection(DriverManager.java:171)
at   beans.DBConn.getConnection11(DBConn.java:28)
at   beans.DBConn.intQuery(DBConn.java:151)
at   org.apache.jsp.check_jsp._jspService(org.apache.jsp.check_jsp:109)
at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
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.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$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at   org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at   org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at   org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at   java.lang.Thread.run(Thread.java:595)
2007-1-29   23:13:19   org.apache.catalina.core.StandardWrapperValve   invoke
严重:   Servlet.service()   for   servlet   jsp   threw   exception
java.lang.NullPointerException
at   beans.DBConn.intQuery(DBConn.java:154)
at   org.apache.jsp.check_jsp._jspService(org.apache.jsp.check_jsp:109)
at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at   org.apache.jasper.servlet.J