Index: oak-core/src/main/java/org/apache/jackrabbit/oak/spi/commit/BackgroundObserver.java
===================================================================
--- oak-core/src/main/java/org/apache/jackrabbit/oak/spi/commit/BackgroundObserver.java	(revision 1675047)
+++ oak-core/src/main/java/org/apache/jackrabbit/oak/spi/commit/BackgroundObserver.java	(working copy)
@@ -227,7 +227,7 @@
             public int getLocalEventCount() {
                 return size(filter(queue, new Predicate<ContentChange>() {
                     @Override
-                    public boolean apply(@Nullable ContentChange input) {
+                    public boolean apply(ContentChange input) {
                         return input.info != null;
                     }
                 }));
@@ -237,7 +237,7 @@
             public int getExternalEventCount() {
                 return size(filter(queue, new Predicate<ContentChange>() {
                     @Override
-                    public boolean apply(@Nullable ContentChange input) {
+                    public boolean apply(ContentChange input) {
                         return input.info == null;
                     }
                 }));