I believe the recent changes as part of (JDK-8193085) in these areas caused the below tests failures in JCK.
api/java_nio/ByteBuffer/index.html#TplMethods: ByteBuffer2078
api/java_nio/CharBuffer/index.html#Methods:CharBuffer2030
api/java_nio/DoubleBuffer/index.html#Methods:DoubleBuffer2030
api/java_nio/FloatBuffer/index.html#Methods: FloatBuffer2030
api/java_nio/IntBuffer/index.html#Methods: IntBuffer2030
api/java_nio/LongBuffer/index.html#Methods: LongBuffer2030
api/java_nio/ShortBuffer/index.html#Methods: ShortBuffer2030

I believe it's a typo in the code :

int i = BufferMismatch.mismatch(this, this.position(),
                                        that, that.position(),
                                        Math.min(this.remaining(), that.remaining()));
        if (i >= 0) {
            return compare(this.get(this.position() + i), that.get(this.position() + i));

Where that.get(that.position() ) instead of that.get(this.position())