An alts release built with JDK 9+ wouldn't work under Java 7 or 8 #7348
Description
From #6829 (comment), I gather that your process may be to build releases with JDK 8. If so, then this is more about convenience for anyone else who might do a local build. (Compare #6839, which dealt with similar calls in core.)
My attempt to turn up other such calls shows some in alts:
$ ./gradlew publishToMavenLocal $ printf '%s\n' ~/.m2/repository/io/grpc/*/1.32.0-SNAPSHOT/*-SNAPSHOT.jar | parallel -q --gnu --will-cite -k bash -c 'jar -tf $1 | grep -oP ".*(?=[.]class$)" | xargs -r javap -private -v -cp $1' - > /tmp/allclasses $ ( R='Method java/nio/\w+Buffer[.](clear|flip|limit:[(]I|mark|position:[(]I|reset|rewind).*[)]Ljava/nio/\w+Buffer;'; grep -P "$R|^Classfile" /tmp/allclasses | grep -P -B 1 "$R" ) Classfile jar:file:///usr/local/google/home/cpovirk/.m2/repository/io/grpc/grpc-alts/1.32.0-SNAPSHOT/grpc-alts-1.32.0-SNAPSHOT.jar!/io/grpc/alts/internal/AltsTsiHandshaker.class 66: invokevirtual #163 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/ByteBuffer; 84: invokevirtual #168 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; -- Classfile jar:file:///usr/local/google/home/cpovirk/.m2/repository/io/grpc/grpc-alts/1.32.0-SNAPSHOT/grpc-alts-1.32.0-SNAPSHOT.jar!/io/grpc/alts/internal/AltsFraming.class 38: invokevirtual #59 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/ByteBuffer; 57: invokevirtual #68 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; 53: invokevirtual #59 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/ByteBuffer; 70: invokevirtual #68 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; -- Classfile jar:file:///usr/local/google/home/cpovirk/.m2/repository/io/grpc/grpc-alts/1.32.0-SNAPSHOT/grpc-alts-1.32.0-SNAPSHOT.jar!/io/grpc/alts/internal/AltsHandshakerClient.class 70: invokevirtual #399 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; 83: invokevirtual #399 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; -- Classfile jar:file:///usr/local/google/home/cpovirk/.m2/repository/io/grpc/grpc-alts/1.32.0-SNAPSHOT/grpc-alts-1.32.0-SNAPSHOT.jar!/io/grpc/alts/internal/AltsFraming$Parser.class 74: invokevirtual #72 // Method java/nio/ByteBuffer.flip:()Ljava/nio/ByteBuffer; 184: invokevirtual #118 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/ByteBuffer; 210: invokevirtual #72 // Method java/nio/ByteBuffer.flip:()Ljava/nio/ByteBuffer; 4: invokevirtual #132 // Method java/nio/ByteBuffer.clear:()Ljava/nio/ByteBuffer; -- Classfile jar:file:///usr/local/google/home/cpovirk/.m2/repository/io/grpc/grpc-alts/1.32.0-SNAPSHOT/grpc-alts-1.32.0-SNAPSHOT.jar!/io/grpc/alts/internal/AltsFraming$Producer.class 25: invokevirtual #78 // Method java/nio/ByteBuffer.flip:()Ljava/nio/ByteBuffer; 45: invokevirtual #83 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/ByteBuffer; 88: invokevirtual #98 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; 4: invokevirtual #103 // Method java/nio/ByteBuffer.clear:()Ljava/nio/ByteBuffer; 16: invokevirtual #98 // Method java/nio/ByteBuffer.position:(I)Ljava/nio/ByteBuffer; 36: invokevirtual #83 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/ByteBuffer; Again, there is no problem with 1.31.1, which I assume you built with JDK 8:
$ wget https://repo1.maven.org/maven2/io/grpc/grpc-alts/1.31.1/grpc-alts-1.31.1.jar $ javap -private -v -cp grpc-alts-1.31.1.jar 'io.grpc.alts.internal.AltsFraming' | grep limit ... 38: invokevirtual #59 // Method java/nio/ByteBuffer.limit:(I)Ljava/nio/Buffer; Still, after a bad protobuf release (protocolbuffers/protobuf#7827) and a near miss with Guava (google/guava#3994), I figured it was worth bringing this up again in case you want to take additional measures.