一个关于JSP隐含对象的问题

Question

package org.apache.jsp;import com.neukingstone.util.Resultobj;
import com.neukingstone.util.WebTools;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import org.apache.jasper.runtime.*;
public class index$jsp extends HttpJspBase {    // begin [file="/oa/index.jsp";from=(4,0);to=(4,91)]
    // end
    // begin [file="/oa/index.jsp";from=(5,0);to=(5,86)]
    // end    static {
    }
    public index$jsp( ) {
    }    private static boolean _jspx_inited = false;    public final void _jspx_init() throws org.apache.jasper.runtime.JspException {
    }    public void _jspService(HttpServletRequest request, HttpServletResponse  response)
        throws java.io.IOException, ServletException {        JspFactory _jspxFactory = null;
        PageContext pageContext = null;
        HttpSession session = null;
        ServletContext application = null;
        ServletConfig config = null;
        JspWriter out = null;
        Object page = this;
        String  _value = null;
        try {            if (_jspx_inited == false) {
                synchronized (this) {
                    if (_jspx_inited == false) {
                        _jspx_init();
                        _jspx_inited = true;
                    }
                }
            }
            _jspxFactory = JspFactory.getDefaultFactory();
            response.setContentType("text/html;charset=GB2312");
            pageContext = _jspxFactory.getPageContext(this, request, response,
"common/ErrorPage.jsp", true, 8192, true);            application = pageContext.getServletContext();
            config = pageContext.getServletConfig();
            session = pageContext.getSession();
            out = pageContext.getOut();