Add some @Nullable annotations

diff --git a/src/main/java/net/pterodactylus/sone/core/Core.java b/src/main/java/net/pterodactylus/sone/core/Core.java
index 37ef0ac..66677de 100644 (file)
--- a/src/main/java/net/pterodactylus/sone/core/Core.java
+++ b/src/main/java/net/pterodactylus/sone/core/Core.java
@@ -554,6 +554,7 @@ public class Core extends AbstractService implements SoneProvider, PostProvider,
         *            The ID of the image
         * @return The image with the given ID
         */
+       @Nullable
        public Image getImage(String imageId) {
                return getImage(imageId, true);
        }
@@ -570,6 +571,7 @@ public class Core extends AbstractService implements SoneProvider, PostProvider,
         * @return The image with the given ID, or {@code null} if none exists and
         *         none was created
         */
+       @Nullable
        public Image getImage(String imageId, boolean create) {
                Optional<Image> image = database.getImage(imageId);
                if (image.isPresent()) {