Dispose managed objects in reverse creation order

RequestScope.java

/**
 * Implementation of the request scope instance.
 */
public static final class Instance {

    /**
     * A map of injectable instances in this scope.
     */
    private final Map<ActiveDescriptor<?>, Object> store;

    private Instance() {
       //Use a LinkedHashMap to keep insertion order
        this.store = new LinkedHashMap<ActiveDescriptor<?>, Object>();
        this.referenceCounter = new AtomicInteger(1);
    }

    /**
     * Release a single reference to the current request scope instance.
     *
     * Once all instance references are released, the instance will be recycled.
     */
    public void release() {
        if (referenceCounter.decrementAndGet() < 1) {
            try {
                //Create a reverse order list to remove the objects from last created to first.
                List<ActiveDescriptor<?>> keys = Lists.reverse(ImmutableList.copyOf(store.keySet()));
                for (final ActiveDescriptor<?> descriptor : keys) {
                    remove(descriptor);
                }
            } finally {
                logger.debugLog("Released scope instance {0}", this);
            }
        }
    }
}