Java program running in background

Question

I have a simple java program which is just a single piece of code that reads from a database and modifies the contents of the database based on certain conditions. Now, what I want is that this program should start automatically at the startup and silently run in the background unless someone kills it from the task manager. I have never done something like this before and don't know exactly how to go about it. Can someone help me out as to how this can be done? Thank you..

You want your java application to run on startup? Why not put a bat file on the startup folder to start the java applicaiotn? That should get it done assuming it's windows... — Thihara
– Thihara, Commented May 5, 2012 at 6:17

Ved · Accepted Answer · 2012-05-05 06:39:19Z

9

Follow the these steps to do the job :(Assuming you are using windows and jre is installed )

First compile your java program and place the class file at one location.
Now create a bat file and place java LOCATION TO THAT CLASS FILE/MyProgram in that.
Put your bat file in start up programs
Restart the system, you will get your program running in back ground..! Hope this will help you.

answered May 5, 2012 at 6:39

Ved

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4 Comments

sachin11 Over a year ago

Thnx for the suggestion. But I am running into a bit of problem when I am giving the absolute path to the class file in the command. Its throwing this error "Exception in thread "main" java.lang.NoClassDefFoundError: C:\Documents and Settings\Desktop\Test". However if I migrate to the directory and then run the command, it works fine! Any insight into this??

Ved Over a year ago

You need to set classpath/path variables in your system.

user1542476 Over a year ago

@blue add this in your answer too ulrichpalha.com/myblog/2011/11/19/…

robin Over a year ago

It's been a long time since this question has been asked, but in case anyone is reading this later on, writing your batch and then creating a Windows link (right click>Create Link) and copying the link in the startup folder avoids the classpath problems

Community · Accepted Answer · 2017-05-23 11:53:50Z

1

There are two problems here

How to add this program to the startup
- Windows - Run Java application at Windows startup
- Linux - Linux start-up script for java application
Run the program as a daemon (background process)
- Simplest way to do is using a while loop and sleep for required time interval in the while loop. Then perform the database operation.

Also for windows, you can check this JSL http://www.roeschter.com/

Thanks.

edited May 23, 2017 at 11:53

CommunityBot

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answered May 5, 2012 at 6:45

Manish Mulani

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1 Comment

Incerteza Over a year ago

doesn't while(true) load a processor 100%?

Box Box Box Box · Accepted Answer · 2016-05-09 05:10:32Z

-3

first create you jar bash and then add it to you crontab task list.

edited May 9, 2016 at 5:10

Box Box Box Box

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answered May 5, 2012 at 6:24

Mike

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1 Comment

Anubhav Sharma Over a year ago

crontab is for scheduling, not for auto-start

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