Solved

Problem with cocurrent runtime.getRuntime.exec processes

Posted on 2011-09-09
17
234 Views
Last Modified: 2012-05-12
Hi

I am executing shellscripts using runtime.getRuntime.exec method. It is taking the first request happily and allowing to do different operations on the site, but if he try to execute the second request immediately before completion of the first request of executing shell script, Server was hanging to take further requests. I am using WASCE server and Java 1.5

Any Help

Thanks
Pavan
0
Comment
Question by:Gangadhara Melukote
  • 7
  • 6
  • 4
17 Comments
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
Same thread or separate threads?
0
 

Author Comment

by:Gangadhara Melukote
Comment Utility
In Different request threads (different requests)
0
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
I think we need more info - what process, what files, etc.
0
 

Author Comment

by:Gangadhara Melukote
Comment Utility
A Simple Spring based Java File containing a method DStreamInstall.sh this file will be get invoked whenever a request(HTTPRequest) comes to this method .

This was under the menu called PackageInstall which will show all the  list of packages. when the user selects a package for the deployment this will invke the installDstream method that was there in the spring based java file. there in the installDstream method i am invoking the shell script DstreamInstall.sh

for the frst request to this method is doing good during the process of the first request it is not hanging at all and giving the responses for further requests if another request came in before completion of the first request(execution of the shellscript) then it is not allowing the user to do any other things.

Thanks
Pavan
0
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
I would imagine it's pretty normal that a package manager (for all sorts of reasons) would not support concurrent use
0
 
LVL 47

Expert Comment

by:for_yan
Comment Utility
So it does not start the seocnd external process?
Or the second process never returns ?
Do you see bothe processes present if youcheck on Unix side ?
0
 

Author Comment

by:Gangadhara Melukote
Comment Utility
It is starting the second process as well, when the second process also running along with first process it is not allowing to do any other requests, it just hangs till the either process completes its execution
0
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
>>
It is starting the second process as well, when the second process also running along with first process it is not allowing to do any other requests, it just hangs till the either process completes its execution
>>

That's perfectly normal for a package manager. They're not designed for concurrent use since such use is normally never required
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.

 
LVL 47

Expert Comment

by:for_yan
Comment Utility
So you mean when the first is running uit allow to start the second one,
when two are running - it does not allow to start the third one?

But it waits and whjen they are completed it starts the third one ?
0
 

Author Comment

by:Gangadhara Melukote
Comment Utility
Yes that's right..in fact we are not able to submit any other request after second as our application  just hangs. So until on of the two started processes don't end we are not able to process anything
0
 
LVL 47

Expert Comment

by:for_yan
Comment Utility
if you run these processs outside any java  - do you obsereve the same thing ?
0
 

Author Comment

by:Gangadhara Melukote
Comment Utility
yes we tried there is no problem from outside java, but if we are sending the request from the browser that to be from the same user after the second request the site was hanging
0
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
>>yes we tried there is no problem from outside java

How did you try it- what did you do?
0
 

Author Comment

by:Gangadhara Melukote
Comment Utility
I Just ran the shell script, i think that is your question am i correct?
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 300 total points
Comment Utility
If it *does* support concurrent use (i'd be surprised) then make sure you're handling Runtime.exec (not trivial) correctly. See

http://technojeeves.com/joomla/index.php/free/52-runtimeexec
0
 
LVL 47

Assisted Solution

by:for_yan
for_yan earned 200 total points
Comment Utility
no from outsisde model the same sityuation - start two of them and see iif you can start the third one
0
 
LVL 86

Expert Comment

by:CEHJ
Comment Utility
:)
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:

763 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

12 Experts available now in Live!

Get 1:1 Help Now