Solved

setting a timer in Java

Posted on 2012-03-14
16
221 Views
Last Modified: 2012-06-27
I have Java code which I would like to run at certain times during the day. I have Windows 2008 Server but I might also be able to do this on a Linux server.
Most of the code is in a file I have attached. I want to add code to read from a database and write to a database (both databases will be remote and won't be on this server).

I am wondering what the best way to have this code run at a certain times. Should I user window's scheduler or chron or is there some way within the java code to have it run at certain times? Also, I can compile this code into a class file. Will the be sufficient to run it or do I have to put it in a jar file? Note, in order for the file to run it needs other classes . These classes are from an open source Java program called Weka. I was going to install it on the server as well. Will this work?

Thanks for you help in advance!
JavaWekaJ48TestTrainPred2.java
0
Comment
Question by:onyourmark
  • 12
  • 4
16 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 37719559
If you want to have it in pure java you can either use Timer and TimeTask classes
or ExctutoThreadPool. You can also download and use java Quartz library
0
 
LVL 47

Assisted Solution

by:for_yan
for_yan earned 500 total points
ID: 37719565
Howevere if this is something you need to run rather rarely, say a few times a day - I'd prefer to use Windows scheduler on Winodws or a cron job in Unix - you'll not need to have a java process present all the time and have the OS or its functions to take care of the schedule
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719570
this is where you canm download Quartz
http://quartz-scheduler.org/
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719576
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719582
0
 

Author Comment

by:onyourmark
ID: 37719585
So your recommendation is to use scheduler/chron I think.
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719588
The issues related to reading/writing database or using third ;party java classes are hardly relevant - you can scheduel your runs for any java program or java process any of these ways
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719591
Yes, if this is somethiong noot happening on every minute scale, I'd think that cron or windows scheduler will provide less overhead and will take care of your schedule not worse than from within java
0
Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

 

Author Comment

by:onyourmark
ID: 37719598
Thanks. OK, also what about compiling this code into a class file. Will that be sufficient to run it or do I have to put it in a jar file? Note, in order for the file to run it needs other classes . These classes are from an open source Java program called Weka. I was going to install it on the server as well. Will this work?
0
 
LVL 47

Assisted Solution

by:for_yan
for_yan earned 500 total points
ID: 37719599
I do have many java applications which I run couple of times a day for years both using Winodws scheduler on PC and using cron on Solaris or Linux - and I never had any problems with those
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719607
In general this is not important if you run your java program from a collection of classes or you pakage them into a jkar file bfore, the main thing that they should be present in the classpath and classpath should be correct; wheteher they are jarred or not is not relevant
0
 

Author Comment

by:onyourmark
ID: 37719614
So I don't need to do more than make them into class files? Is it hard to get them to run using the scheduler?
0
 
LVL 47

Accepted Solution

by:
for_yan earned 500 total points
ID: 37719616
Usually if you want to move your program form one computer to another, or to deliver it tyo the users, then jar files are more handy than folders with classes, but form the point of view of running java application it does not matter
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719621
Your third partyu classes (iusually packaged into the jar file) need to be accessible in the cvlasspath
of course also
0
 

Author Closing Comment

by:onyourmark
ID: 37719622
Thanks so much!
0
 
LVL 47

Expert Comment

by:for_yan
ID: 37719643
You are always welcome.
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Suggested Solutions

For customizing the look of your lightweight component and making it look opaque like it was made of plastic.  This tip assumes your component to be of rectangular shape and completely opaque.   (CODE)
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now