JDB Tutorial JDB Tutorial Start jdb . Only one thread is currently running in this threadgroup. Object variables can be printed as well. Technically, that class name is really java.lang.Thread, but jdb will make its best guess if you specify a partial name. Each line is a separate stack frame whose display varies slightly depending on how that file was compiled.
Every line displays the full method name and signature.
The first line then shows a stack frame where the class was optimized and has no line number information, while the next line shows one with line numbers. Inc. Last updated September 5, 1995.