tokens: Because you 're using old fashioned JSP scriptlets <% %> instead of normal Java classes such as servlets to control the request/response and do the business stuff in the JSP , it 's harder to naildown the root cause of the NullPointerException .
ner_tags: O O O O O O B-Library B-File_Name B-Code_Block I-Code_Block O O O B-Language O O O B-Class O O O O O O O O O O O B-Library O O O O O O O O O O O B-Error_Name O