Runtime.exec not releasing lock on files

Hi,
I am using Runtime.exec to launch an external application, a batch file that runs a java program and generates a pdf file on disk. The Runtime.exec is called from inside the callback function of a toolbar button in my UI. Once, the runtime.exec returns, I popup a alert saying "pdf generated successfully". However, when I try to open the pdf that has been generated, I get a message saying the "program is in use by another program" or some such message. Only when I quit my GUI application, Iam able to open the pdf file using acrobat reader.
Can someone tell me how to solve this problem. I have tried doing proc.waitFor() etc.
Cheers,
vidyut

You can try some of sysinternals tools to look through file sharing information and decide what process is locked file.
PS Try to ensure that you start java in same process as batch file executes, overthise you just can't ensure it terminates on time.

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>
I'm trying to invoke a C++ executable from java using
the Runtime.exec() method. The C++ application accepts
a filename as a command line argument & opens the
file. This C++ app is unicode enabled i.e. it can
accept UTF-16 (wide char) parameters. Howevere, when i
invoke this application using Java's Runtime.exec()
and specify a japanese file name as an argument, the
japanese characters get converted to '?' characters by
the time they are received in the C++ application. I'm
running this application on Windows 2K, default i.e.
English version.
Looking at the source code of Runtime class, it seems
that the exec()
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