Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Creating my own library - thread safe issues

Creating my own library - thread safe issues

Creating my own library - thread safe issues

I'm in the process of creating a my own library.  I've studied the internet and forums and articles about synchronization, locking, and even what seems to be the advise for libraries is standard pojo but with thread safe wrappers.

I'm so confused. I'm new in Java, created plenty of classes, exceptions and web services which works great.  Coming from Delphi background most of these are not new to me.  Building libraries is a different matter.

I have 2 concerns:

1. Using the lib classes from an EJB
2. Using it from multiple threads.

Creating a class instance per thread or instance seems to be the logical (maybe incorrect) conclusion. This will ensure that each validation is not interfered with.

My scenario is as follows:

I have a class that does validation of a string. This process will include parsing of the string, looking data up in a database or hashmap or some structure and then constructing an output which is not just a singel string but can be a number of fields of varying types.


public class Validator {

  private String _string_to_validate = null;
  private final String resultString1 = null;
  private final int resultInt1 = -1;
  public Validator() {

  public void validate() {
    //parse the string and do db lookups etc

  public void validate(String value) {
    this._string_to_validate = value;

  private void doSomeStuff() {
    //manipulate string and set results
    resultInt1 = 9292;
    resultString1 = "whatever I need to set it to";


Is this ok? Please help.

RE: Creating my own library - thread safe issues

I can't see where is the problem: your class has not static variables, so there will be differente instances running with no synchronization problems. The application server with handle thread and classes issues for you.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close