public synchronized void setSenderIfNull(InternalDistributedMember sendr) {
    if (sender == null) {
      sender = sendr;
    }
  }
Sets the member that threw the received exception

@param sendr the member that threw the exception
@since GemFire 6.0
geode-core/src/main/java/org/apache/geode/distributed/internal/ReplyException.java