What methods can be used to implement the creation of new contexts in an application?

In Java, creating new contexts in an application can be implemented in several ways, depending on what exactly is meant by "context":

1. Using ClassLoader classes — to create isolated loading contexts, for example, in plugin systems.

2. Creating new threads (Thread) — each thread has its own stack and execution context.

3. Using the application context (ApplicationContext) in Spring Framework — you can create new contexts to isolate beans and configurations.

4. Using ThreadLocal — to store data specific to the current thread, thus creating a thread-bound context.

5. Using security context (SecurityContext) — to manage security information within a session or request.

Example of creating a new thread with a local context:

Thread thread = new Thread(() -> {
    // Local execution context
    System.out.println("New context in a separate thread");
});
thread.start();

In Spring, to create a new ApplicationContext:

ApplicationContext parentContext = ...;
AnnotationConfigApplicationContext newContext = new AnnotationConfigApplicationContext();
newContext.setParent(parentContext);
newContext.register(SomeConfig.class);
newContext.refresh();

Thus, the choice of method depends on the specific task and the level of isolation required.