How to close PST file

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I am using java-libpst.0.7.jar for reading pst messages. I am using the 
following code to open the pst file to read messages.
PSTFile pstFile = new PSTFile("Path of the pst file");

I have to close the pst file once after getting the message details. But there 
is no option to close the pst file. Please help me how to do this.

Original issue reported on code.google.com by nithya2...@gmail.com on 27 Nov 2014 at 6:28