diff --git a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCache.java b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCache.java
index eddbb92ed1..e2c5bc2d71 100644
--- a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCache.java
+++ b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCache.java
@@ -26,6 +26,8 @@
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
+import com.google.errorprone.annotations.CheckReturnValue;
+
 /**
  * A semi-persistent mapping from keys to values. Cache entries are manually added using
  * {@link #get(Object, Function)} or {@link #put(Object, CompletableFuture)}, and are stored in the
@@ -178,6 +180,7 @@ CompletableFuture<Map<K, V>> getAll(Iterable<? extends K> keys,
    *
    * @return a thread-safe view of this cache supporting all of the optional {@link Map} operations
    */
+  @CheckReturnValue
   ConcurrentMap<K, CompletableFuture<V>> asMap();
 
   /**
@@ -188,5 +191,6 @@ CompletableFuture<Map<K, V>> getAll(Iterable<? extends K> keys,
    *
    * @return a thread-safe synchronous view of this cache
    */
+  @CheckReturnValue
   Cache<K, V> synchronous();
 }
diff --git a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCacheLoader.java b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCacheLoader.java
index d7e269dd43..5f7902cd14 100644
--- a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCacheLoader.java
+++ b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncCacheLoader.java
@@ -26,6 +26,8 @@
 
 import org.checkerframework.checker.nullness.qual.NonNull;
 
+import com.google.errorprone.annotations.CheckReturnValue;
+
 /**
  * Computes or retrieves values asynchronously, based on a key, for use in populating a
  * {@link AsyncLoadingCache}.
@@ -125,6 +127,7 @@ default CompletableFuture<? extends V> asyncReload(
    * @return an asynchronous cache loader that delegates to the supplied {@code mappingFunction}
    * @throws NullPointerException if the mappingFunction is null
    */
+  @CheckReturnValue
   static <K extends Object, V extends Object> AsyncCacheLoader<K, V> bulk(
       Function<? super Set<? extends K>, ? extends Map<? extends K, ? extends V>> mappingFunction) {
     return CacheLoader.bulk(mappingFunction);
@@ -146,6 +149,7 @@ static <K extends Object, V extends Object> AsyncCacheLoader<K, V> bulk(
    * @return an asynchronous cache loader that delegates to the supplied {@code mappingFunction}
    * @throws NullPointerException if the mappingFunction is null
    */
+  @CheckReturnValue
   static <K extends Object, V extends Object> AsyncCacheLoader<K, V> bulk(
       BiFunction<? super Set<? extends K>, ? super Executor,
       ? extends CompletableFuture<? extends Map<? extends K, ? extends V>>> mappingFunction) {
diff --git a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncLoadingCache.java b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncLoadingCache.java
index da2c56f92b..f16c4d4f5a 100644
--- a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncLoadingCache.java
+++ b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/AsyncLoadingCache.java
@@ -20,6 +20,8 @@
 
 import org.checkerframework.checker.nullness.qual.NonNull;
 
+import com.google.errorprone.annotations.CheckReturnValue;
+
 /**
  * A semi-persistent mapping from keys to values. Values are automatically loaded by the cache
  * asynchronously, and are stored in the cache until either evicted or manually invalidated.
@@ -89,5 +91,6 @@ public interface AsyncLoadingCache<K extends @NonNull Object, V extends @NonNull
    * @return a thread-safe synchronous view of this cache
    */
   @Override
+  @CheckReturnValue
   LoadingCache<K, V> synchronous();
 }
diff --git a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Cache.java b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Cache.java
index 5655b8cddb..84e2cbc470 100644
--- a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Cache.java
+++ b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Cache.java
@@ -26,6 +26,7 @@
 import org.checkerframework.checker.nullness.qual.PolyNull;
 
 import com.github.benmanes.caffeine.cache.stats.CacheStats;
+import com.google.errorprone.annotations.CheckReturnValue;
 
 /**
  * A semi-persistent mapping from keys to values. Cache entries are manually added using
@@ -180,6 +181,7 @@ Map<K, V> getAll(Iterable<? extends K> keys,
    * @return the estimated number of mappings
    */
   @NonNegative
+  @CheckReturnValue
   long estimatedSize();
 
   /**
@@ -191,6 +193,7 @@ Map<K, V> getAll(Iterable<? extends K> keys,
    *
    * @return the current snapshot of the statistics of this cache
    */
+  @CheckReturnValue
   CacheStats stats();
 
   /**
@@ -208,6 +211,7 @@ Map<K, V> getAll(Iterable<? extends K> keys,
    *
    * @return a thread-safe view of this cache supporting all of the optional {@link Map} operations
    */
+  @CheckReturnValue
   ConcurrentMap<K, V> asMap();
 
   /**
@@ -223,5 +227,6 @@ Map<K, V> getAll(Iterable<? extends K> keys,
    *
    * @return access to inspect and perform advanced operations based on the cache's characteristics
    */
+  @CheckReturnValue
   Policy<K, V> policy();
 }
diff --git a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/CacheLoader.java b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/CacheLoader.java
index 134bbd9e2e..6804c2b75b 100644
--- a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/CacheLoader.java
+++ b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/CacheLoader.java
@@ -27,6 +27,8 @@
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
+import com.google.errorprone.annotations.CheckReturnValue;
+
 /**
  * Computes or retrieves values, based on a key, for use in populating a {@link LoadingCache} or
  * {@link AsyncLoadingCache}.
@@ -211,6 +213,7 @@ default CompletableFuture<? extends V> asyncReload(
    * @return a cache loader that delegates to the supplied {@code mappingFunction}
    * @throws NullPointerException if the mappingFunction is null
    */
+  @CheckReturnValue
   static <K extends Object, V extends Object> CacheLoader<K, V> bulk(
       Function<? super Set<? extends K>, ? extends Map<? extends K, ? extends V>> mappingFunction) {
     requireNonNull(mappingFunction);
diff --git a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Caffeine.java b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Caffeine.java
index b373787dee..a61f02b1a5 100644
--- a/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Caffeine.java
+++ b/caffeine/src/main/java/com/github/benmanes/caffeine/cache/Caffeine.java
@@ -46,6 +46,7 @@
 import com.github.benmanes.caffeine.cache.stats.CacheStats;
 import com.github.benmanes.caffeine.cache.stats.ConcurrentStatsCounter;
 import com.github.benmanes.caffeine.cache.stats.StatsCounter;
+import com.google.errorprone.annotations.CheckReturnValue;
 import com.google.errorprone.annotations.FormatMethod;
 
 /**
@@ -224,6 +225,7 @@ static long ceilingPowerOfTwo(long x) {
    *
    * @return a new instance with default settings
    */
+  @CheckReturnValue
   public static Caffeine<Object, Object> newBuilder() {
     return new Caffeine<>();
   }
@@ -234,6 +236,7 @@ public static Caffeine<Object, Object> newBuilder() {
    * @param spec the specification to build from
    * @return a new instance with the specification's settings
    */
+  @CheckReturnValue
   public static Caffeine<Object, Object> from(CaffeineSpec spec) {
     Caffeine<Object, Object> builder = spec.toBuilder();
     builder.strictParsing = false;
@@ -246,6 +249,7 @@ public static Caffeine<Object, Object> from(CaffeineSpec spec) {
    * @param spec a String in the format specified by {@link CaffeineSpec}
    * @return a new instance with the specification's settings
    */
+  @CheckReturnValue
   public static Caffeine<Object, Object> from(String spec) {
     return from(CaffeineSpec.parse(spec));
   }
@@ -1030,6 +1034,7 @@ boolean isBounded() {
    * @param <V1> the value type of the cache
    * @return a cache having the requested features
    */
+  @CheckReturnValue
   public <K1 extends K, V1 extends V> Cache<K1, V1> build() {
     requireWeightWithWeigher();
     requireNonLoadingCache();
@@ -1055,6 +1060,7 @@ public <K1 extends K, V1 extends V> Cache<K1, V1> build() {
    * @param <V1> the value type of the loader
    * @return a cache having the requested features
    */
+  @CheckReturnValue
   public <K1 extends K, V1 extends V> LoadingCache<K1, V1> build(
       CacheLoader<? super K1, V1> loader) {
     requireWeightWithWeigher();
@@ -1086,6 +1092,7 @@ public <K1 extends K, V1 extends V> LoadingCache<K1, V1> build(
    * @param <V1> the value type of the cache
    * @return a cache having the requested features
    */
+  @CheckReturnValue
   public <K1 extends K, V1 extends V> AsyncCache<K1, V1> buildAsync() {
     requireState(valueStrength == null, "Weak or soft values can not be combined with AsyncCache");
     requireState(writer == null, "CacheWriter can not be combined with AsyncCache");
@@ -1117,6 +1124,7 @@ public <K1 extends K, V1 extends V> AsyncCache<K1, V1> buildAsync() {
    * @param <V1> the value type of the loader
    * @return a cache having the requested features
    */
+  @CheckReturnValue
   public <K1 extends K, V1 extends V> AsyncLoadingCache<K1, V1> buildAsync(
       CacheLoader<? super K1, V1> loader) {
     return buildAsync((AsyncCacheLoader<? super K1, V1>) loader);
@@ -1140,6 +1148,7 @@ public <K1 extends K, V1 extends V> AsyncLoadingCache<K1, V1> buildAsync(
    * @param <V1> the value type of the loader
    * @return a cache having the requested features
    */
+  @CheckReturnValue
   public <K1 extends K, V1 extends V> AsyncLoadingCache<K1, V1> buildAsync(
       AsyncCacheLoader<? super K1, V1> loader) {
     requireState(valueStrength == null,
diff --git a/caffeine/src/test/java/com/github/benmanes/caffeine/cache/AsyncLoadingCacheTest.java b/caffeine/src/test/java/com/github/benmanes/caffeine/cache/AsyncLoadingCacheTest.java
index 17ca60e70b..f967247f31 100644
--- a/caffeine/src/test/java/com/github/benmanes/caffeine/cache/AsyncLoadingCacheTest.java
+++ b/caffeine/src/test/java/com/github/benmanes/caffeine/cache/AsyncLoadingCacheTest.java
@@ -416,14 +416,16 @@ public void asyncReload() throws Exception {
     assertThat(future.join(), is(-1));
   }
 
+  @SuppressWarnings("CheckReturnValue")
   @Test(expectedExceptions = NullPointerException.class)
-  public void bulk_function_null_() {
+  public void bulk_function_null() {
     Function<Set<? extends Integer>, Map<Integer, Integer>> f = null;
     AsyncCacheLoader.bulk(f);
   }
 
+  @SuppressWarnings("CheckReturnValue")
   @Test(expectedExceptions = NullPointerException.class)
-  public void bulk_bifunction_null_() {
+  public void bulk_bifunction_null() {
     BiFunction<Set<? extends Integer>, Executor, CompletableFuture<Map<Integer, Integer>>> f = null;
     AsyncCacheLoader.bulk(f);
   }
diff --git a/caffeine/src/test/java/com/github/benmanes/caffeine/cache/CaffeineTest.java b/caffeine/src/test/java/com/github/benmanes/caffeine/cache/CaffeineTest.java
index 306c9af36f..5028adee2a 100644
--- a/caffeine/src/test/java/com/github/benmanes/caffeine/cache/CaffeineTest.java
+++ b/caffeine/src/test/java/com/github/benmanes/caffeine/cache/CaffeineTest.java
@@ -44,7 +44,7 @@
  *
  * @author ben.manes@gmail.com (Ben Manes)
  */
-@SuppressWarnings({"PreferJavaTimeOverload", "deprecation"})
+@SuppressWarnings({"PreferJavaTimeOverload", "deprecation", "CheckReturnValue"})
 public final class CaffeineTest {
   @Mock StatsCounter statsCounter;
   @Mock Expiry<Object, Object> expiry;
diff --git a/caffeine/src/test/java/com/github/benmanes/caffeine/cache/LoadingCacheTest.java b/caffeine/src/test/java/com/github/benmanes/caffeine/cache/LoadingCacheTest.java
index 446b766deb..c753156747 100644
--- a/caffeine/src/test/java/com/github/benmanes/caffeine/cache/LoadingCacheTest.java
+++ b/caffeine/src/test/java/com/github/benmanes/caffeine/cache/LoadingCacheTest.java
@@ -769,6 +769,7 @@ public void asyncReload() throws Exception {
     assertThat(future.get(), is(-1));
   }
 
+  @SuppressWarnings("CheckReturnValue")
   @Test(expectedExceptions = NullPointerException.class)
   public void bulk_null() {
     CacheLoader.bulk(null);
diff --git a/guava/src/main/java/com/github/benmanes/caffeine/guava/CaffeinatedGuava.java b/guava/src/main/java/com/github/benmanes/caffeine/guava/CaffeinatedGuava.java
index 83bbd579b9..a1441b7f5e 100644
--- a/guava/src/main/java/com/github/benmanes/caffeine/guava/CaffeinatedGuava.java
+++ b/guava/src/main/java/com/github/benmanes/caffeine/guava/CaffeinatedGuava.java
@@ -23,6 +23,7 @@
 import com.google.common.cache.Cache;
 import com.google.common.cache.CacheLoader;
 import com.google.common.cache.LoadingCache;
+import com.google.errorprone.annotations.CheckReturnValue;
 
 /**
  * An adapter to expose a Caffeine cache through the Guava interfaces.
@@ -39,6 +40,7 @@ private CaffeinatedGuava() {}
    * @param builder the configured cache builder
    * @return a cache exposed under the Guava APIs
    */
+  @CheckReturnValue
   public static <K, V, K1 extends K, V1 extends V> Cache<K1, V1> build(Caffeine<K, V> builder) {
     return new CaffeinatedGuavaCache<>(builder.build());
   }
@@ -50,6 +52,7 @@ public static <K, V, K1 extends K, V1 extends V> Cache<K1, V1> build(Caffeine<K,
    * @param loader the cache loader used to obtain new values
    * @return a cache exposed under the Guava APIs
    */
+  @CheckReturnValue
   public static <K, V, K1 extends K, V1 extends V> LoadingCache<K1, V1> build(
       Caffeine<K, V> builder, CacheLoader<? super K1, V1> loader) {
     @SuppressWarnings("unchecked")
@@ -66,6 +69,7 @@ public static <K, V, K1 extends K, V1 extends V> LoadingCache<K1, V1> build(
    * @param loader the cache loader used to obtain new values
    * @return a cache exposed under the Guava APIs
    */
+  @CheckReturnValue
   public static <K, V, K1 extends K, V1 extends V> LoadingCache<K1, V1> build(
       Caffeine<K, V> builder,
       com.github.benmanes.caffeine.cache.CacheLoader<? super K1, V1> loader) {
diff --git a/guava/src/test/java/com/github/benmanes/caffeine/cache/CaffeineSpecGuavaTest.java b/guava/src/test/java/com/github/benmanes/caffeine/cache/CaffeineSpecGuavaTest.java
index f249d656b6..dc101b6c85 100644
--- a/guava/src/test/java/com/github/benmanes/caffeine/cache/CaffeineSpecGuavaTest.java
+++ b/guava/src/test/java/com/github/benmanes/caffeine/cache/CaffeineSpecGuavaTest.java
@@ -32,7 +32,7 @@
  *
  * @author Adam Winer
  */
-@SuppressWarnings("PreferJavaTimeOverload")
+@SuppressWarnings({"PreferJavaTimeOverload", "CheckReturnValue"})
 public class CaffeineSpecGuavaTest extends TestCase {
 
   public void testParse_empty() {
diff --git a/guava/src/test/java/com/google/common/cache/CacheBuilderTest.java b/guava/src/test/java/com/google/common/cache/CacheBuilderTest.java
index 439a2b5b22..3639198130 100644
--- a/guava/src/test/java/com/google/common/cache/CacheBuilderTest.java
+++ b/guava/src/test/java/com/google/common/cache/CacheBuilderTest.java
@@ -238,6 +238,7 @@ public void testTimeToLive_negative_duration() {
     }
   }
 
+  @SuppressWarnings("CheckReturnValue")
   public void testTimeToLive_small() {
     CaffeinatedGuava.build(Caffeine.newBuilder()
         .expireAfterWrite(1, NANOSECONDS), identityLoader());
@@ -284,6 +285,7 @@ public void testTimeToIdle_negative_duration() {
     }
   }
 
+  @SuppressWarnings("CheckReturnValue")
   public void testTimeToIdle_small() {
     CaffeinatedGuava.build(Caffeine.newBuilder()
         .expireAfterAccess(1, NANOSECONDS), identityLoader());
@@ -312,6 +314,7 @@ public void testTimeToIdle_setTwice_duration() {
     }
   }
 
+  @SuppressWarnings("CheckReturnValue")
   public void testTimeToIdleAndToLive() {
     CaffeinatedGuava.build(Caffeine.newBuilder()
         .expireAfterWrite(1, NANOSECONDS)