Solved

Java gets a lock on opened file preventing others to get a write lock

Posted on 2011-09-15
11
346 Views
Last Modified: 2013-11-24
We are opening a website from our application , which has a java digital sign applet running for signing xml files with .pfx.
But due to this ,java gets a lock on all the open files in our program.
We cannot get a write lock on that file using ,
Open App.path & "\" & "BlackBox" & ".LOG" For Random Access Read Write Lock Write As #LOGNUM Len = LOGLEN
It will also not allow to kill that file.
Can anyone explain this behaviour of java and suggest a workaround?

Also, after i read that file in a vb code, it will allow me to get a write lock on that file. strange!

0
Comment
Question by:winman_soft
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 3
  • 2
11 Comments
 
LVL 4

Expert Comment

by:reijnemans
ID: 36542206
Hi

How do you read the file with your java application. Maybe those links are usefull:

http://mohammed-technical.blogspot.com/2011/02/how-to-read-file-without-locking-in.html

regards,

Reijnemans
0
 

Author Comment

by:winman_soft
ID: 36542218
the java applet is run from the website which I open.
It gets a lock on all the files opened in my program
0
 
LVL 4

Expert Comment

by:reijnemans
ID: 36542241
"my program" is the java applet? how do you open the fiels in "my program"?
0
Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

 

Author Comment

by:winman_soft
ID: 36542267
sorry for not being clear...
I have a vb6 application(my program) which opens a website with java applet. But it gets a lock on all the opened files in my program.i.e the vb6 app.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 36542331
First of all, you need to find out exactly what's locked and by what:

http://technet.microsoft.com/en-us/sysinternals/bb896655

Let us know what you find
0
 

Author Comment

by:winman_soft
ID: 36542540
thanks for the answer..
I found out that java has a lock on the file using handle..
How to check if there is a lock on the file and close that handle from my program..
I found some info here : http://www.codeproject.com/KB/shell/OpenedFileFinder.aspx
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 36542796
You need to kill the process (Java) that has them open
0
 

Author Comment

by:winman_soft
ID: 36542817
but doing that might effect other programs using java!
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 36542881
That's true, but it's the only way. A workaround might be to work on copies of the open files and rename them later if necessary
0
 

Accepted Solution

by:
winman_soft earned 0 total points
ID: 36548118
I found a way to close the handle..
http://www.codeproject.com/KB/shell/OpenedFileFinder.aspx
0
 

Author Closing Comment

by:winman_soft
ID: 36572232
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

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

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
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…
Viewers learn about the third conditional statement “else if” and use it in an example program. Then additional information about conditional statements is provided, covering the topic thoroughly. Viewers learn about the third conditional statement …
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…

627 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