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Is there any way to access Javadoc information via reflection, the way annotations can be retained at runtime?
If not, how does Eclipse access the javadoc for .jar files?
Comments used for Javadoc are never retained in compiled classes (see http://java.sun.com/docs/books/jvms/second_edition/ClassFileFormat-Java5.pdf for instance). Eclipse is able to associate Javadoc to the referenced jar files either by extracting it from the jar (if present), by direct association with the jar file (set by yourself or a plugin like m2eclipse), or by finding it inside the JRE javadoc (set directly in “Installed JREs”).