private static @Nullable JvmMethod getJvmMethod(JvmClass cls, JvmMethodSignature sig) {
    return sig != null? find(cls.getMethods(), m -> Objects.equals(m.getName(), sig.getName()) && Objects.equals(m.getDescriptor(), sig.getDescriptor())) : null;
  }
private static @Nullable JvmMethod getJvmMethod(JvmClass cls, JvmMethodSignature sig)