diff --git a/core/src/main/java/io/grpc/internal/ServerCallImpl.java b/core/src/main/java/io/grpc/internal/ServerCallImpl.java
index 290c9c310f..8ff60f4375 100644
--- a/core/src/main/java/io/grpc/internal/ServerCallImpl.java
+++ b/core/src/main/java/io/grpc/internal/ServerCallImpl.java
@@ -45,9 +45,9 @@ final class ServerCallImpl<ReqT, RespT> extends ServerCall<ReqT, RespT> {
   private static final Logger log = Logger.getLogger(ServerCallImpl.class.getName());
 
   @VisibleForTesting
-  static String TOO_MANY_RESPONSES = "Too many responses";
+  static final String TOO_MANY_RESPONSES = "Too many responses";
   @VisibleForTesting
-  static String MISSING_RESPONSE = "Completed without a response";
+  static final String MISSING_RESPONSE = "Completed without a response";
 
   private final ServerStream stream;
   private final MethodDescriptor<ReqT, RespT> method;
diff --git a/core/src/test/java/io/grpc/internal/AbstractClientStreamTest.java b/core/src/test/java/io/grpc/internal/AbstractClientStreamTest.java
index 801cf446f8..badd716516 100644
--- a/core/src/test/java/io/grpc/internal/AbstractClientStreamTest.java
+++ b/core/src/test/java/io/grpc/internal/AbstractClientStreamTest.java
@@ -27,8 +27,6 @@ import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
 import io.grpc.Attributes;
-import io.grpc.CallOptions;
-import io.grpc.ClientStreamTracer;
 import io.grpc.Codec;
 import io.grpc.Metadata;
 import io.grpc.Status;
@@ -226,14 +224,6 @@ public class AbstractClientStreamTest {
   public void getRequest() {
     AbstractClientStream.Sink sink = mock(AbstractClientStream.Sink.class);
     final TestClientStreamTracer tracer = new TestClientStreamTracer();
-    ClientStreamTracer.Factory tracerFactory =
-        new ClientStreamTracer.Factory() {
-          @Override
-          public ClientStreamTracer newClientStreamTracer(
-              CallOptions callOptions, Metadata headers) {
-            return tracer;
-          }
-        };
     StatsTraceContext statsTraceCtx = new StatsTraceContext(new StreamTracer[] {tracer});
     AbstractClientStream stream = new BaseAbstractClientStream(allocator,
         new BaseTransportState(statsTraceCtx), sink, statsTraceCtx, true);
diff --git a/core/src/test/java/io/grpc/internal/MessageDeframerTest.java b/core/src/test/java/io/grpc/internal/MessageDeframerTest.java
index bd140d98a7..f0eb14a662 100644
--- a/core/src/test/java/io/grpc/internal/MessageDeframerTest.java
+++ b/core/src/test/java/io/grpc/internal/MessageDeframerTest.java
@@ -62,8 +62,6 @@ public class MessageDeframerTest {
   private Listener listener = mock(Listener.class);
   private TestBaseStreamTracer tracer = new TestBaseStreamTracer();
   private StatsTraceContext statsTraceCtx = new StatsTraceContext(new StreamTracer[]{tracer});
-  private ArgumentCaptor<Long> wireSizeCaptor = ArgumentCaptor.forClass(Long.class);
-  private ArgumentCaptor<Long> uncompressedSizeCaptor = ArgumentCaptor.forClass(Long.class);
 
   private MessageDeframer deframer = new MessageDeframer(listener, Codec.Identity.NONE,
       DEFAULT_MAX_MESSAGE_SIZE, statsTraceCtx, "test");
@@ -397,10 +395,6 @@ public class MessageDeframerTest {
     assertEquals(uncompressedBytesReceived, tracer.getInboundUncompressedSize());
   }
 
-  private static List<Byte> bytes(ArgumentCaptor<InputStream> captor) {
-    return bytes(captor.getValue());
-  }
-
   private static List<Byte> bytes(InputStream in) {
     try {
       return Bytes.asList(ByteStreams.toByteArray(in));
diff --git a/protobuf-lite/src/test/java/io/grpc/protobuf/lite/ProtoLiteUtilsTest.java b/protobuf-lite/src/test/java/io/grpc/protobuf/lite/ProtoLiteUtilsTest.java
index c4a4d32174..7134a507ab 100644
--- a/protobuf-lite/src/test/java/io/grpc/protobuf/lite/ProtoLiteUtilsTest.java
+++ b/protobuf-lite/src/test/java/io/grpc/protobuf/lite/ProtoLiteUtilsTest.java
@@ -180,7 +180,6 @@ public class ProtoLiteUtilsTest {
 
   @Test
   public void testDrainTo_none() throws Exception {
-    byte[] golden = ByteStreams.toByteArray(marshaller.stream(proto));
     InputStream is = marshaller.stream(proto);
     byte[] unused = ByteStreams.toByteArray(is);
     Drainable d = (Drainable) is;