B4J Question jExcel does not close workbook


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I am trying to use jExcel in a non UI server project.

I can successfully open a template, create a new WritableWorkbook, modify the contents and save. However it appears that even though I call Close, the new file remains locked and can only be opened in Excel Read Only until the Java application is closed.

Does anyone have any idea what might be wrong?

Attached is a very simple (UI) app that reproduces the issue.

I'm using the latest version of jxl.jar (v2.6.12)