TomcatTransportTest > clientChecksInboundMetadataSize_header FAILED
    java.lang.NullPointerException at CoyoteOutputStream.java:154

> Task :grpc-android-interop-testing:mergeDexDebug
ERROR:/home/kbuilder/.gradle/caches/modules-2/files-2.1/com.google.errorprone/error_prone_annotations/2.36.0/227d4d4957ccc3dc5761bd897e3a0ee587e750a7/error_prone_annotations-2.36.0.jar: D8: java.lang.NullPointerException

> Task :grpc-android-interop-testing:lintVitalAnalyzeRelease

> Task :grpc-android-interop-testing:minifyReleaseWithR8
WARNING:Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /tmpfs/src/github/grpc-java/android-interop-testing/build/outputs/mapping/release/missing_rules.txt.

WARNING:R8: Missing class com.google.protobuf.Descriptors$Descriptor (referenced from: com.google.protobuf.Descriptors$Descriptor io.grpc.health.v1.HealthProto.internal_static_grpc_health_v1_HealthCheckRequest_descriptor and 6 other contexts)
Missing class com.google.protobuf.Descriptors$FileDescriptor (referenced from: com.google.protobuf.Descriptors$FileDescriptor io.grpc.health.v1.HealthProto.descriptor and 2 other contexts)
Missing class com.google.protobuf.GeneratedMessageV3$Builder (referenced from: void io.grpc.health.v1.HealthCheckRequest$Builder.() and 13 other contexts)
Missing class com.google.protobuf.GeneratedMessageV3$FieldAccessorTable (referenced from: com.google.protobuf.GeneratedMessageV3$FieldAccessorTable io.grpc.health.v1.HealthProto.internal_static_grpc_health_v1_HealthCheckRequest_fieldAccessorTable and 2 other contexts)
Missing class com.google.protobuf.GeneratedMessageV3 (referenced from: void io.grpc.health.v1.HealthCheckRequest.() and 7 other contexts)
Missing class com.google.protobuf.Message (referenced from: io.grpc.health.v1.HealthCheckRequest io.grpc.health.v1.HealthCheckRequest$Builder.build() and 2 other contexts)
Missing class com.google.protobuf.MessageOrBuilder (referenced from: io.grpc.health.v1.HealthCheckRequestOrBuilder and 1 other context)
Missing class com.google.protobuf.ProtocolMessageEnum (referenced from: io.grpc.health.v1.HealthCheckResponse$ServingStatus)
Missing class com.google.protobuf.UnknownFieldSet (referenced from: io.grpc.health.v1.HealthCheckRequest$Builder io.grpc.health.v1.HealthCheckRequest$Builder.mergeFrom(io.grpc.health.v1.HealthCheckRequest) and 7 other contexts)

> Task :grpc-android-interop-testing:mergeDexDebug FAILED
> Task :grpc-android-interop-testing:optimizeReleaseResources

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':grpc-android-interop-testing:mergeDexDebug'.
> Could not resolve all files for configuration ':grpc-android-interop-testing:debugRuntimeClasspath'.
   > Failed to transform error_prone_annotations-2.36.0.jar (com.google.errorprone:error_prone_annotations:2.36.0) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexing-min-sdk=20, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime}.
      > Execution failed for DexingWithClasspathTransform: /home/kbuilder/.gradle/caches/modules-2/files-2.1/com.google.errorprone/error_prone_annotations/2.36.0/227d4d4957ccc3dc5761bd897e3a0ee587e750a7/error_prone_annotations-2.36.0.jar.
         > Error while dexing.