class test { private String function () { String a = "555\n555"; a = "ggg"; return a; } } Scenario A (Selection Paste): Use the mouse to select the \n characters (inside the double quotes), copy them, ...
If you want to debug eclipse.jdt.ls itself, add -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=1044 right after java and ensure nothing else is running on port 1044. If you want to ...