diff --git a/android/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java b/android/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java
index 0fa3e2a88ebd..4bb0031dc2b0 100644
--- a/android/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java
+++ b/android/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java
@@ -63,7 +63,7 @@ byte crc32Checksum(int reps) throws Exception {
     byte result = 0x01;
     for (int i = 0; i < reps; i++) {
       CRC32 checksum = new CRC32();
-      checksum.update(testBytes);
+      checksum.update(testBytes, 0, testBytes.length);
       result = (byte) (result ^ checksum.getValue());
     }
     return result;
@@ -81,7 +81,7 @@ byte adler32Checksum(int reps) throws Exception {
     byte result = 0x01;
     for (int i = 0; i < reps; i++) {
       Adler32 checksum = new Adler32();
-      checksum.update(testBytes);
+      checksum.update(testBytes, 0, testBytes.length);
       result = (byte) (result ^ checksum.getValue());
     }
     return result;
diff --git a/android/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java b/android/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java
index 52532bb61ac2..0b9c87489c67 100644
--- a/android/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java
+++ b/android/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java
@@ -21,6 +21,7 @@
 import java.io.IOException;
 import java.io.StringReader;
 import java.io.StringWriter;
+import java.nio.Buffer;
 import java.nio.CharBuffer;
 import java.util.Random;
 
@@ -40,10 +41,10 @@ long copy(Readable from, Appendable to) throws IOException {
         CharBuffer buf = CharStreams.createBuffer();
         long total = 0;
         while (from.read(buf) != -1) {
-          buf.flip();
+          ((Buffer) buf).flip();
           to.append(buf);
           total += buf.remaining();
-          buf.clear();
+          ((Buffer) buf).clear();
         }
         return total;
       }
diff --git a/android/pom.xml b/android/pom.xml
index 5ca3e868029b..f1e8a2596ddd 100644
--- a/android/pom.xml
+++ b/android/pom.xml
@@ -508,7 +508,7 @@
                      be passed as part of the same <arg> as -Xplugin:ErrorProne,
                      and I gave up trying to figure out how to do that for test
                      compilation only. -->
-                <arg>-Xplugin:ErrorProne -Xep:NullArgumentForNonNullParameter:OFF</arg>
+                <arg>-Xplugin:ErrorProne -Xep:NullArgumentForNonNullParameter:OFF -Xep:Java8ApiChecker:ERROR</arg>
                 <!-- https://github.com/google/error-prone/blob/f8e33bc460be82ab22256a7ef8b979d7a2cacaba/docs/installation.md#jdk-16 -->
                 <!-- TODO(cpovirk): Use .mvn/jvm.config instead (per
                      https://errorprone.info/docs/installation#maven) if it can
diff --git a/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java b/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java
index 0fa3e2a88ebd..4bb0031dc2b0 100644
--- a/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java
+++ b/guava-tests/benchmark/com/google/common/hash/ChecksumBenchmark.java
@@ -63,7 +63,7 @@ byte crc32Checksum(int reps) throws Exception {
     byte result = 0x01;
     for (int i = 0; i < reps; i++) {
       CRC32 checksum = new CRC32();
-      checksum.update(testBytes);
+      checksum.update(testBytes, 0, testBytes.length);
       result = (byte) (result ^ checksum.getValue());
     }
     return result;
@@ -81,7 +81,7 @@ byte adler32Checksum(int reps) throws Exception {
     byte result = 0x01;
     for (int i = 0; i < reps; i++) {
       Adler32 checksum = new Adler32();
-      checksum.update(testBytes);
+      checksum.update(testBytes, 0, testBytes.length);
       result = (byte) (result ^ checksum.getValue());
     }
     return result;
diff --git a/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java b/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java
index 52532bb61ac2..0b9c87489c67 100644
--- a/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java
+++ b/guava-tests/benchmark/com/google/common/io/CharStreamsCopyBenchmark.java
@@ -21,6 +21,7 @@
 import java.io.IOException;
 import java.io.StringReader;
 import java.io.StringWriter;
+import java.nio.Buffer;
 import java.nio.CharBuffer;
 import java.util.Random;
 
@@ -40,10 +41,10 @@ long copy(Readable from, Appendable to) throws IOException {
         CharBuffer buf = CharStreams.createBuffer();
         long total = 0;
         while (from.read(buf) != -1) {
-          buf.flip();
+          ((Buffer) buf).flip();
           to.append(buf);
           total += buf.remaining();
-          buf.clear();
+          ((Buffer) buf).clear();
         }
         return total;
       }
diff --git a/pom.xml b/pom.xml
index a36161445235..1cb2a0be6e8b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -515,7 +515,7 @@
                      be passed as part of the same <arg> as -Xplugin:ErrorProne,
                      and I gave up trying to figure out how to do that for test
                      compilation only. -->
-                <arg>-Xplugin:ErrorProne -Xep:NullArgumentForNonNullParameter:OFF</arg>
+                <arg>-Xplugin:ErrorProne -Xep:NullArgumentForNonNullParameter:OFF -Xep:Java8ApiChecker:ERROR</arg>
                 <!-- https://github.com/google/error-prone/blob/f8e33bc460be82ab22256a7ef8b979d7a2cacaba/docs/installation.md#jdk-16 -->
                 <!-- TODO(cpovirk): Use .mvn/jvm.config instead (per
                      https://errorprone.info/docs/installation#maven) if it can