How to access the reference of already running java application ?

Question

1.00/5 (1 vote)

See more:

C#

We want to design a application , let X.jar
If we first time run it than the new window should open after
that if we run it than no new instance should be create , application must communicate 
with already running instance .

What I have tried:

We want to design a application , let X.jar
If we first time run it than the new window should open after
that if we run it than no new instance should be create , application must communicate
with already running instance .

Posted 12-Apr-16 23:04pm

NCRK Rajput

Updated 12-Apr-16 23:48pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Rahul Rajat Singh · Answer 1 · 2016-04-12T23:48:00

This is the classic case of having a single instance of an application. This is achieved by using mutex.

have a mutex in your Main class. when the application starts, check if this mutex is available, if yes then acquire it and start the app. If not, just exit the main method.

Now when you are closing the application, release the mutex.

So the first instance:
check the mutex.
since it is free, it will acquire and start the app.

Second instance:
check the mutex.
its not available, so just exit(possibly with user message).

First instance:
when closing, release the mutex so that next time it could start.

This is the general algorithm to solve this problem. You can find java specific code for this now.