# Transportclient 502 after Added nodes in cluster

**URL:** <https://discuss.elastic.co/t/transportclient-502-after-added-nodes-in-cluster/257492>\
**Category:** Elasticsearch\
**Created:** [December 3, 2020, 11:06am UTC](https://discuss.elastic.co/t/transportclient-502-after-added-nodes-in-cluster/257492 "2020-12-03T11:06:29Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![arthurxx](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/arthurxx/32/80161_2.png) [@arthurxx](https://discuss.elastic.co/u/arthurxx)\
**Post date:** [December 5, 2020, 2:15pm UTC](https://discuss.elastic.co/t/transportclient-502-after-added-nodes-in-cluster/257492/6 "2020-12-05T14:15:23Z")

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thank you. I'll try it.

BTW, I find that in the client side, our system create more than one java transpotclient instances.

In another discuss( [TranspotClient thread sage](https://discuss.elastic.co/t/transportclient-thread-safe/12366/2) ), you mentioned the whole jvm need only one client instance. why if there are multiple instances of java client , it will be not thread safe? and what will happen if create multiple clients? I haven't find any explanations in the official document. could you give the answer or some error cases by multiple client instances or the document url ?

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