?
Solved

Problem with Runtime.getRuntime().exec()

Posted on 2011-03-16
5
Medium Priority
?
647 Views
Last Modified: 2012-05-11
Hi All,

I am using

Process ps=Runtime.getRuntimetime().exe()
int exitvalue=ps.waitfor();

to execute a shell script which communicates with ftp host and prints all the folders and files to a file, I am deploying in WAS CE. If i am not used for some days the application, it is giving NullPointerException. If i restared the server and used the application it is working fine. I am not getting where the problem is can any one help me in getting the solution for this

Thanks in advance
Pavan
0
Comment
Question by:Gangadhara Melukote
  • 2
  • 2
5 Comments
 
LVL 92

Expert Comment

by:objects
ID: 35145006
can you post the stack trace for the NPE
0
 

Author Comment

by:Gangadhara Melukote
ID: 35145145
It is comming when there is a delay in sending request to that piece of code. At present i dont have the trace but sure it is not returning the Process Object
Thanks
Pavan
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 2000 total points
ID: 35145152
Depending on how you're using Runtime.exec, it might well lock up a process stream which could turn into a NPE further down the line. See

http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

and

http://technojeeves.com/joomla/index.php/free/52-runtimeexec for a solution if that's a problem
0
 
LVL 92

Expert Comment

by:objects
ID: 35145171
Locking up of runtime exec would not cause an NPE, it would  cause your method to not return.
Let me know when you have more info and I'll have a look at it for you
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 35296506
:)
0

Featured Post

The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
In this post we will learn how to make Android Gesture Tutorial and give different functionality whenever a user Touch or Scroll android screen.
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
The viewer will learn how to implement Singleton Design Pattern in Java.
Suggested Courses
Course of the Month6 days, 12 hours left to enroll

592 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