For some reason intellij does not autocomplete certain classes even though they exist on classpath.
Maybe it has to do with stale Maven dependencies, not sure. Seems like the class is indexed only
after spelling out the fully qualified class name and hitting alt+enter.
Another slight variant of the problem above. Say you have two classes called AbstractList and AbstractMap.
Sometimes intellij choose to autocomplete only one class from a set of classes with matching letters in the beginning.
The remaining set of classes is shown only after you typed the first letter that separate them.
Im running with default settings.