使用bean报错：请各位大哥指教

Question

显示这个文件看看\tomcat\bin\..\work\localhost\_\scan_jsp.java

Answer 1

package org.apache.jsp;import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import org.apache.jasper.runtime.*;
public class scan_jsp extends HttpJspBase {    // begin [file="C:\\tomcat\\webapps\\ROOT\\scan.jsp";from=(1,0);to=(1,77)]
    // end    static {
    }
    public scan_jsp( ) {
    }    private static boolean _jspx_inited = false;    public final void _jspx_init() throws org.apache.jasper.JasperException {
    }    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=8859_1");
            pageContext = _jspxFactory.getPageContext(this, request, response,
"", true, 8192, true);            application = pageContext.getServletContext();
            config = pageContext.getServletConfig();
            session = pageContext.getSession();
            out = pageContext.getOut();            // HTML // begin [file="C:\\tomcat\\webapps\\ROOT\\scan.jsp";from=(0,46);to=(1,0)]
                out.write("\r\n");            // end
            // begin [file="C:\\tomcat\\webapps\\ROOT\\scan.jsp";from=(1,0);to=(1,77)]
                filterbean.filterbean p_bean = null;
                boolean _jspx_specialp_bean  = false;
                 synchronized (application) {
                    p_bean= (filterbean.filterbean)
                    pageContext.getAttribute("p_bean",PageContext.APPLICATION_SCOPE);
                    if ( p_bean == null ) {
                        _jspx_specialp_bean = true;
                        try {
                            p_bean = (filterbean.filterbean) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "filterbean.filterbean");
                        } catch (Exception exc) {
                             throw new ServletException (" Cannot create bean of class "+"filterbean.filterbean", exc);
                        }
                        pageContext.setAttribute("p_bean", p_bean, PageContext.APPLICATION_SCOPE);
                    }
                 } 
                if(_jspx_specialp_bean == true) {
            // end
            // begin [file="C:\\tomcat\\webapps\\ROOT\\scan.jsp";from=(1,0);to=(1,77)]
                }
            // end
            // HTML // begin [file="C:\\tomcat\\webapps\\ROOT\\scan.jsp";from=(1,77);to=(2,0)]
                out.write("\r\n");            // end
            // begin [file="C:\\tomcat\\webapps\\ROOT\\scan.jsp";from=(2,2);to=(6,0)]
                
                 String aa=p_bean.scan();
                 out.println(aa);
                }
            // end        } catch (Throwable t) {
            if (out != null && out.getBufferSize() != 0)
                out.clearBuffer();
            if (pageContext != null) pageContext.handlePageException(t);
        } finally {
            if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
        }
    }
}

Answer 2

Throwable 能够被 catch吗？

Answer 3

Throwable 当然能够被 catch

Answer 4

我也曾遇到这样的问题。不过，我是在JSP中使用JavaBeans做Web组件访问EJB，在我的程序里，出错的原因很简单，就是JSP文件中的小脚本里，有关if/else的语句不匹配。抱错的原因是，JSP文件被JSP引擎翻译成Servlet时将所有的if/else都翻译成try/catch。我想，你可以检查一下程序中的if/else及其相关的语句的“{/}”是否配对。成不成，都告诉我一声，我再想别的办法。