A call to `sweep()`, although protected by the lock for concurrent calls to `reserve()`, may be concurrent with `remove(Entry)`.

`remove(Entry)` in turn calls `entries.remove(Object)`, so that the concurrent iteration in `sweep()` over `entries` fails with an `ArrayIndexOutOfBoundsException`.

Now using the bulk `entries.removeIf(Predicate)` method in `sweep()`, so that sweeping is atomic with respect to `entries.remove(Object)`.

Signed-off-by: Simone Bordet <[email protected]>

… that may be concurrent with removals.

Signed-off-by: Simone Bordet <[email protected]>

Signed-off-by: Simone Bordet <[email protected]>