Win a copy of Svelte and Sapper in Action this week in the JavaScript forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Bear Bibeault
  • Junilu Lacar
  • Jeanne Boyarsky
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • salvin francis
  • Frits Walraven
  • Scott Selikoff
  • Piet Souris
  • Carey Brown

service() method

Ranch Hand
Posts: 333
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The service() method is not threadsafe. Only one instance of a servlet is created. For each request, a new thread is spawned.
My question:
If some code is written in the service class which updates a database table, and different clients access the servlet at the same time (in effect, the service() method) then how is database consistency handled?
Ranch Hand
Posts: 1512
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I am assuming you mean service method when you said "If some code is written in the service class ".

First, you are not supposed to override the service method. This mathod is called by the container based on the requests it receives from the client. Your code should go in doGet/doPost and the service method will call the appropriate one.

Secondly, if you have any concern regarding multiple requests accessing/updating your database simultanously, the you have to handle that in your code in doPost/doGet. You can synchronize the piece of logic that updates the database so that only one thread of your particular servlet instance will be able to access it at a time.
In the renaissance, how big were the dinosaurs? Did you have tiny ads?
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
    Bookmark Topic Watch Topic
  • New Topic