1 files changed, 8 insertions, 5 deletions
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java b/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java
index 1a5771eb..49124b00 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java
@@ -20,7 +20,7 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
 import io.opencensus.common.Function;
-import io.opencensus.implcore.internal.NullnessUtils;
+import io.opencensus.implcore.internal.CheckerFrameworkUtils;
 import io.opencensus.stats.Aggregation;
 import io.opencensus.stats.BucketBoundaries;
 
@@ -100,7 +100,8 @@ abstract class MutableAggregation {
         Function<? super MutableCount, T> p1,
         Function<? super MutableMean, T> p2,
         Function<? super MutableDistribution, T> p3) {
-      return NullnessUtils.<MutableSum, T>removeSuperFromFunctionParameterType(p0).apply(this);
+      return CheckerFrameworkUtils.<MutableSum, T>removeSuperFromFunctionParameterType(p0)
+          .apply(this);
     }
   }
 
@@ -146,7 +147,8 @@ abstract class MutableAggregation {
         Function<? super MutableCount, T> p1,
         Function<? super MutableMean, T> p2,
         Function<? super MutableDistribution, T> p3) {
-      return NullnessUtils.<MutableCount, T>removeSuperFromFunctionParameterType(p1).apply(this);
+      return CheckerFrameworkUtils.<MutableCount, T>removeSuperFromFunctionParameterType(p1)
+          .apply(this);
     }
   }
 
@@ -214,7 +216,8 @@ abstract class MutableAggregation {
         Function<? super MutableCount, T> p1,
         Function<? super MutableMean, T> p2,
         Function<? super MutableDistribution, T> p3) {
-      return NullnessUtils.<MutableMean, T>removeSuperFromFunctionParameterType(p2).apply(this);
+      return CheckerFrameworkUtils.<MutableMean, T>removeSuperFromFunctionParameterType(p2)
+          .apply(this);
     }
   }
 
@@ -356,7 +359,7 @@ abstract class MutableAggregation {
         Function<? super MutableCount, T> p1,
         Function<? super MutableMean, T> p2,
         Function<? super MutableDistribution, T> p3) {
-      return NullnessUtils.<MutableDistribution, T>removeSuperFromFunctionParameterType(p3)
+      return CheckerFrameworkUtils.<MutableDistribution, T>removeSuperFromFunctionParameterType(p3)
           .apply(this);
     }
   }