Serious: servlet.service () for servlet JSP Three Exception, find the answer, find the reason! ! ! Online, etc

Error is that the null pointer in line 15 is abnormal, so find "."in line 15, indicating that the signature object is empty.

It indicates that the list variable did not get the expected value.

Or the parameters specified in getAttribute("newss ") do not match those specified in setAttribute("xx"); Or newss is a key submitted through a form, you should use the getParameter("newss ") method to get the value entered in the form.

If you want to improve the robustness of the program, you should add a judgment statement if (list! =null), the program will not throw any more exceptions, and it can if(list == null){ go to the error page or display an error message}.

Where do people usually buy photo albums? What kind of album do you want to buy?

Are there any new regulations on the qualification accreditation standards for construction drawing review agencies?

Contents of workshop safety production morning meeting

Yes, sand sculptures have names.

How to check the authenticity of electronic invoices

Dump Aaron Kwok and talk about several foreign men. At the age of 46, they married small fresh meat. Why is Christy Chung so wild?

3 personal signatures of life motto

Off-court life in alain perrin

What are the names of these two rich women?

All the information about Aaron (including family, debut, personality, etc. ) should be complete.