Cleanup use of Guava library

[yangtools.git] / common / util / src / main / java / org / opendaylight / yangtools / util / SingletonSet.java

diff --git a/common/util/src/main/java/org/opendaylight/yangtools/util/SingletonSet.java b/common/util/src/main/java/org/opendaylight/yangtools/util/SingletonSet.java
index af024857da5c39de2437a13ab4169ec6ac512ca0..76359e2f7ccf85b4a10facef097a36ddee7adcc4 100644 (file)
--- a/common/util/src/main/java/org/opendaylight/yangtools/util/SingletonSet.java
+++ b/common/util/src/main/java/org/opendaylight/yangtools/util/SingletonSet.java
@@ -7,8 +7,9 @@
  */
 package org.opendaylight.yangtools.util;
 
+import static java.util.Objects.requireNonNull;
+
 import com.google.common.annotations.Beta;
-import com.google.common.base.Preconditions;
 import com.google.common.collect.Iterators;
 import java.io.Serializable;
 import java.util.Collection;
@@ -176,7 +177,7 @@ public abstract class SingletonSet<E> implements Set<E>, Immutable, Serializable
         private final E element;
 
         RegularSingletonSet(final E element) {
-            this.element = Preconditions.checkNotNull(element);
+            this.element = requireNonNull(element);
         }
 
         @Override