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Associating the Library with a Public
Part 
You associate the JAR file with a public part.
● A JAR file is added to the development component (DC).
● A public part is created.
...
1. Open the Resource Perspective and expand the DC project.
2. In the context menu of the JAR file, choose Development Component ® Add to Public Part.
3. Select the public part and choose OK.
You have associated the library with a public part.