Java ThreadLocal singleton – what is it?

Laymen say, what does it mean when someone says that an object is a thread singleton in Java? I'm attending a lecture on Java Server faces. Every time I talk about facescontext - the lecturer always reminds us that this is a single threaded single person

Solution

Each thread has only one unique instance of facescontext

Facesservlet creates a ThreadLocal < facescontext > at the beginning of the HTTP servlet request and deletes it at the end of the HTTP servlet response associated with the HTTP servlet request Whenever you execute facescontext#getcurrentinstance() in JSF code, you will always get the same instance in the whole HTTP servlet request / response processing

Since HTTP servlet requests are executed by different threads and facescontext instances are attached to a single thread as thread local variables, no two HTTP servlet requests share the same facescontext instance