exception - index out of bounds in jsp and servlet -

-

type exception report

message java.lang.indexoutofboundsexception: index: 0, size: 0

description server encountered internal error prevented fulfilling request.

root cause 

  java.lang.indexoutofboundsexception: index: 0, size: 0 java.util.arraylist.rangecheck(unknown source) java.util.arraylist.get(unknown source) com.ncr.usedetails.displaydetails.<init>(displaydetails.java:20) org.apache.jsp.success_jsp._jspservice(success_jsp.java:72) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70) javax.servlet.http.httpservlet.service(httpservlet.java:731) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:439) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:395) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:339) javax.servlet.http.httpservlet.service(httpservlet.java:731) org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52) com.ncr.registration.putdetails.dopost(putdetails.java:81) javax.servlet.http.httpservlet.service(httpservlet.java:650) javax.servlet.http.httpservlet.service(httpservlet.java:731) org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)

what causing error , how resolve it?

there form(jsp file) has entries ,the servlet(let call a) gets these entries stores them in database.the servlet(a) passes these entries arraylist stores them(i.e. have defined arraylist outside dopost() , used reference variable inside dopost() value of these entries in arraylist).i have defined method outside dopost() has return type of list , returns arraylist.

in class(let call b) import servlet class , use method defined in servlet class arraylist.i store arraylist in new list object.using reference capture value of indexes want inside strings(this inside constructor of class b i.e. entire process of storing arraylist of class in list done inside constructor of class b ).i have method inside class b gets value of arraylist index 0 , stores in string.now use class(b) inside jsp importing inside <%@ %> , creating it's object inside<% %> , calling method gets value of index 0 of arraylist. store value of object.method() inside string variable. , print variable hello! <%=variable %>. there no errors(compile time errors) in code.

(p.s not post code here because lengthy.)

the class display details:- package com.ncr.usedetails;

 import java.util.*;    import com.ncr.registration.putdetails;     public class displaydetails     {      private string fname,lname,uname,pword;     putdetails putdetails=new putdetails();     list<string> catchinglist=new arraylist<string>();     public displaydetails()     {      catchinglist=putdetails.getlistdetails();        fname=catchinglist.get(0);       lname=catchinglist.get(1);       uname=catchinglist.get(2);       pword=catchinglist.get(3);        }      public string getfirstname()    {        return fname;       }   }

check this

com.ncr.usedetails.displaydetails.<init>(displaydetails.java:20)

line number 20 in displaydetails.java, there must array fetch operation taking place.

the array seems empty. try sysout (or log, if have logging enabled) , check value on server console/log file.

edit: in response of comments , code posted, try

 public displaydetails()     {     catchinglist=putdetails.getlistdetails();     // print size of list, check on server console.     system.out.println(catchinglist.size());      // because expecting 4 elements, check beforehand if have indeed 4 elements.     if(catchinglist.size() >= 4) {       fname=catchinglist.get(0);       lname=catchinglist.get(1);       uname=catchinglist.get(2);       pword=catchinglist.get(3);     }else {      // not getting 4 elements, there in array list. lets print on server console.       system.out.println(catchinglist);     } }

this 1 way debug, on whether getting expected.


Comments

Post a Comment

Popular posts from this blog

python - pip install -U PySide error -

-
does know how avoid following error when running pip install -u pyside per official website instructions here: https://pypi.python.org/pypi/pyside/#installing-pyside-on-a-mac-os-x-system note have done brew install qt successfully. you using pip version 7.0.3, version 7.1.2 available. should consider upgrading via 'pip install --upgrade pip' command. collecting pyside using cached pyside-1.2.4.tar.gz installing collected packages: pyside running setup.py install pyside complete output command /applications/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-build-cpxemt/pyside/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-0r7hri-record/install-record.txt --single-version-externally-managed --compile: ...
Read more

arrays - C++ error: a brace-enclosed initializer is not allowed here before ‘{’ token -

-
simple question: i'm trying initialize array within c++ class declaration: using namespace std; #include <string> class myclass{ public: string myarray[] = {"a","b","c"}; }; and i'm getting error: error: brace-enclosed initializer not allowed here before ‘{’ token no, without complied c++11 compiler, cannot initialize member array in declaration. have initialize array member in constructor. , don't use open array if know number of elements initialize array.
Read more

cytoscape.js - How to add nodes to Dagre layout with Cytoscape -

-
i trying add nodes dagre graph through cityscape.js. problem nodes not painted. code have: cy.add({ group: "nodes", data: { id:"n0",name:"n0",weight: 75 }, }); $.ajax(url).done(function(jsontree){ var newnodes=[]; for(var i=1;i<6;i++){ //var child = jsontree.result[i]; newnodes.push( { group: "nodes", data: { id: "n"+i, name:"n"+i}}, { group: "edges", data: { id: "e"+i, source: "n0", target: "n"+i } } ); } cy.add(newnodes); any ideas? have used loaded function reload graph not work. not know if have use specific function reload graph. thank in advance. you need add positions new nodes. cytoscape.js docs : it important note positions of newly added nodes must defined when calling cy.add(). nodes can not placed in graph without valid position — otherwise not displayed. yo...
Read more