Starting in Java 9, the resource in a try-with-resources statement can be a reference to a final or effectively-final variable.

That is, you can write this:

AutoCloseable resource = ...;
try (resource) {
  doSomething(resource);
}

instead of this:

AutoCloseable resource = ...;
try (AutoCloseable resource2 = resource) {
  doSomething(resource2);
}

NOTE: the resource cannot be an arbitrary expression, for example try (returnsTheResources()) { ... } is still not allowed.