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run multiple java applications

Posted on 2006-10-31
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Last Modified: 2012-06-21
I have to create a scheduled task in which i have to run  4 separate applications -

1. java -jar cleaner.exe  --- cleans a file
2. sqlldr  --to load clean data
3. java -jar regulator.exe ---- compares new data with old data
4. java -jar findposition.exe - finds position for each record.

I want these application to run one after other. So sqlldr should not run until cleaner has finished cleaning and so on...

Now if I create a single batch file to run all the above applications, will all of these run in a sequence?
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Question by:at999
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Expert Comment

by:sciuriware
ID: 17847770
Yes, in an ordinary .bat they will run sequentially.


Another approach may be:

1) run them from another JAVA program
2) join them and call their 'main()'-s from another class

Everything is good.

;JOOP!
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Assisted Solution

by:objects
objects earned 50 total points
ID: 17848120
> Now if I create a single batch file to run all the above applications, will all of these run in a sequence?

depends on the application, and whether it completes processing before exitting.
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Expert Comment

by:sciuriware
ID: 17848132
>>> I want these application to run one after other
Let's assume that or it will be very complex.

;JOOP!
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Assisted Solution

by:TheMajestic
TheMajestic earned 50 total points
ID: 17848301
hi,

as mebtioned earlier in ordinary batch file it will run sequentially but there r prob .

so the best way i to use ant. in ant u can specify a dependency for a job to excute.that is for example the sqlldr will run only after the succesfull excution of its dependency job lets say cleaner.exe.

i think ant bulider is a best way to run this process.
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Assisted Solution

by:DaBump
DaBump earned 50 total points
ID: 17849085
Look at the java open source scheduling technology called Quartz:

http://www.java-source.net/open-source/job-schedulers/quartz

Good luck...
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by:
sciuriware earned 100 total points
ID: 17849421
Off topic!
the question was: Now if I create a single batch file to run all the above applications, will all of these run in a sequence?

And the answer is YES.

;JOOP!
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Author Comment

by:at999
ID: 17851739
like if i type in a batch file -
notepad.exe
notepad.exe
notepad.exe

And if I run this batch file,
It wont open the next notepad until the previous one is closed!!!

Would the same thing happen with java.exe and sqlldr.exe???

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Expert Comment

by:sciuriware
ID: 17851779
Yes.
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Author Comment

by:at999
ID: 17852463
Does it depend on operating system?? - XP, NT Server etc?
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Expert Comment

by:sciuriware
ID: 17852697
No
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Expert Comment

by:sciuriware
ID: 17852759
The word 'batch' refers to a sequence, so it's the same everywhere
and has been over 50 years.

;JOOP!
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Author Comment

by:at999
ID: 17852918
many thanks...:)
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