org.apache.jasper.JasperException: Exception in JSP: /indent_detail.jsp:24

显示全部楼层 · 2009-5-6 16:19:11

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
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.lang.NullPointerException
org.apache.jsp.indent_005fdetail_jsp._jspService(indent_005fdetail_jsp.java:77)
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:332)
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)
indent_detail.jsp:
5:

千问 · 2009-5-6 16:19:11

username=(String)session.getAttribute("username"); if(username.equals("")){ out.println(""); }if应该判断session.getAttribute("username")是否Null ，然后赋值给username你这样写就是username=Null 然后再调用 .equals() 当然java.lang.NullPointerException...

千问 · 2009-5-6 16:19:11

空指针异常, 一步一步调试看看哪个对象没有创建成功或是对象引用失败...

千问 · 2009-5-6 16:19:11

可能是上面的那个字段写错了吧你在仔细找找看...

千问 · 2009-5-6 16:19:11

空指针异常：你把表单中的值是放在request范围内还是session范围内了。...