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

Posted on 2011-09-15
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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!

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Question by:winman_soft
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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
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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
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LVL 4

Expert Comment

by:reijnemans
ID: 36542241
"my program" is the java applet? how do you open the fiels in "my program"?
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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.
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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
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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
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Expert Comment

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

by:winman_soft
ID: 36542817
but doing that might effect other programs using java!
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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
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Accepted Solution

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

by:winman_soft
ID: 36572232
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