BindBytes.java

@BindingAnnotation(BindBytes.BytesBinderFactory.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.PARAMETER})
public @interface BindBytes {
    String value();

    class BytesBinderFactory implements BinderFactory {
        public Binder build(final Annotation annotation) {
            return new Binder<BindBytes, byte[]>() {
                public void bind(SQLStatement q, BindBytes bind, byte[] arg) {
                    String name = ((BindBytes) annotation).value();
                    q.bind(name, UtilKt.hexify(arg));
                }
            };
        }
    }
}

binds.kt

@BindingAnnotation(BindBytes.BytesBinderFactory::class)
@Retention(RetentionPolicy.RUNTIME)
@Target(AnnotationTarget.VALUE_PARAMETER)
annotation class BindBytes(val value: String)

class BytesBinderFactory : BinderFactory {
    override fun build(annotation: Annotation): Binder<BindBytes, ByteArray> {
        return Binder { q, bind, arg ->
            val name = (annotation as BindBytes).value
            q.bind(name, arg.hexify())
        }
    }
}