奇怪的jdbc连接错误

我的代码如下：（test.jsp）
<%@ page import="java.lang.*,java.io.*, java.sql.*, java.util.*" contentType="text/html;charset=gb2312" %>
  <% 
   Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
   String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs";
   //pubs is your database 已经存在的数据库
   String user="sa";
   String password="123456";
   Connection conn= DriverManager.getConnection(url,user,password);
   Statement sql=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
   ResultSet rs;
   rs=sql.executeQuery("Select * From authors");
  out.println(" Congratulation!");
   while(rs.next())
    out.println(rs.getString(1));    
%>
运行成功，显示：
Congratulation! 172-32-1176 213-46-8915 238-95-7766 267-41-2394 274-80-9391 341-22-1782 409-56-7008 427-17-2319 472-27-2349 486-29-1786 527-72-3246 648-92-1872 672-71-3249 712-45-1867 722-51-5454 724-08-9931 724-80-9391 756-30-7391 807-91-6654 846-92-7186 893-72-1158 899-46-2035 998-72-3567 但是把数据库改成master就不行了，其他的数据库都不行，只有pubs才可以，很奇怪，出现问题如下：
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Exception in JSP: /test.jsp:118:    Connection conn= DriverManager.getConnection(url,user,password);
9:    Statement sql=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
10:    ResultSet rs;
11:    rs=sql.executeQuery("Select * From authors");
12:   out.println(" Congratulation!");
13:    while(rs.next())
14:     out.println(rs.getString(1));    
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause javax.servlet.ServletException: [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]对象名 'authors' 无效。
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:843)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:776)
org.apache.jsp.test_jsp._jspService(test_jsp.java:69)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC][SQLServer]对象名 'authors' 无效。
com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
com.microsoft.jdbc.sqlserver.tds.TDSRequest.processErrorToken(Unknown Source)
com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReplyToken(Unknown Source)
com.microsoft.jdbc.sqlserver.tds.TDSRPCRequest.processReplyToken(Unknown Source)
com.microsoft.jdbc.sqlserver.tds.TDSRequest.processReply(Unknown Source)
com.microsoft.jdbc.sqlserver.tds.TDSCursorRequest.openCursor(Unknown Source)
com.microsoft.jdbc.sqlserver.SQLServerImplStatement.execute(Unknown Source)
com.microsoft.jdbc.base.BaseStatement.commonExecute(Unknown Source)
com.microsoft.jdbc.base.BaseStatement.executeQueryInternal(Unknown Source)
com.microsoft.jdbc.base.BaseStatement.executeQuery(Unknown Source)
org.apache.jsp.test_jsp._jspService(test_jsp.java:57)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.