To add to this, if you use maven along with the maven-eclipse-plugin, configure the plugin to automatically download the javadoc jars from the repo. That way when you generate your eclipse descriptor from maven, your jars will be set on the javadoc lookup path for you. This does go without saying not all libs will have there javadoc in the repos and you would have to put the javadocs for any proprietary libs in your local repo (assuming they are available).
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To add to this, if you use maven along with the maven-eclipse-plugin, configure the plugin to automatically download the javadoc jars from the repo. That way when you generate your eclipse descriptor from maven, your jars will be set on the javadoc lookup path for you. This does go without saying not all libs will have there javadoc in the repos and you would have to put the javadocs for any proprietary libs in your local repo (assuming they are available).