it sounds like Ecipse may be seeing an older version of the plugin. There were significant changes to the architecture of the Designer plugin in order for the Javadoc support to work. This means that if a previous version of the API was installed, you need to remove that first via File > Application > Application Management.... You'll also need to restart after uninstalling any previous versions.
Author: Oliver Busse
http://about.me/oliverbusse
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