If you are using maven, installing a dependency on Scala should instruct the plugin to pull javadocs (and the source for this question) from the repository. If you are not using maven for dependency management ... Well, you should start now.
By the way, exposing Scala types for Java is not good practice. You must wrap your Scala code in standard Java. This will greatly improve maintainability of the code, since developers using your banks will not have to twist their heads by switching Java to Scala types.
Cloves almeida
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