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On certain occasions, Firefox might choose not to display certain Java applets.
This is due to the applet having mixed security. In order to fix this, go to about:config and look for the name:
Change the value to false, and refresh the page containing the Java applet.
A method to design records so that they're allocated on a specific byte boundary, such as 16 bytes, 512 bytes, 4096 bytes, etc.