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Creating a Library Archive 
A library archive defines a deployable unit with which you can make all the JARs and references in the library project available in the J2EE engine.
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1. Select the library project node in the J2EE Explorer.
2. Open the context menu and choose Build Library Archive.
3. Choose OK to confirm the displayed message.
An archive file with the extension .sda is created. A corresponding node for the new archive is added to the project structure.

