View Tomcat/TomEE/Java web server thread dump ?
To show in console the thread dump just type : Control + Pause/break and done.
Another way more friendly you can use Java Visual VM.
To find them try this path:
Finally, here some screenshots for more info. I hope, this information help to solve you problem.
Console Thread dump:
Example path to find the Java Visual VM
Graphic User Interface - Java Visual VM