<!-- IF YOUR ISSUE CONCERNS RUNNING/DEBUGGING JAVA CODE, PLEASE OPEN YOUR TICKET IN https://github.com/microsoft/vscode-java-debug/issues --> "Stream.concat(..)" should offer quickfix on "Stream" to "import java.util.stream.Stream". it and lots of other classes in JDK does not but some do, i.e. java.util.* classes seem to be offered automatically....not sure what the pattern is.