Select the Show Thread Groups command [ ] to change if thread groups should be used to organize threads displayed in the Debug View.
Debugger Local debugging Remote debugging
Changing debugger launch options Connecting to a remote VM with the Remote Java application launch configuration Disconnecting from a VM Launching a Java program Preparing to debug Resuming the execution of suspended threads Running and debugging Stepping through the execution of a program Suspending threads
Debug View Debug preferences Show Monitors Show System Threads Show Thread Groups