# Java.lang.NullPointerException error after copy plugin and no known master node

**URL:** <https://discuss.elastic.co/t/java-lang-nullpointerexception-error-after-copy-plugin-and-no-known-master-node/22211>\
**Category:** Elasticsearch\
**Created:** [February 17, 2015, 3:48pm UTC](https://discuss.elastic.co/t/java-lang-nullpointerexception-error-after-copy-plugin-and-no-known-master-node/22211 "2015-02-17T15:48:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ali\_Lotfdar](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@Ali\_Lotfdar](https://discuss.elastic.co/u/Ali_Lotfdar)\
**Post date:** [February 17, 2015, 3:48pm UTC](https://discuss.elastic.co/t/java-lang-nullpointerexception-error-after-copy-plugin-and-no-known-master-node/22211/1 "2015-02-17T15:48:49Z")

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Hi All,

I am trying to write plugin foe ES. Whenever, I copy the plugin inside  
plugin folder of ES, I encounter with this error and ES dose not respond to  
any comments(even after restarting ES and deleting plugin). So, I restart  
the computer and it is fixed. Could you please let me know what is the  
reason and if there is another way to solve it except restarting computer.

java.lang.NullPointerException error after copy plugin and no known master  
node.  
no known master node, scheduling a retry  
observer: timeout notification from cluster service. timeout setting [30s],  
time since start [30s]....

[2015-02-17 10:45:34,660][ERROR][marvel.agent.exporter] [Tommy] failed  
to verify/upload the marvel template to [[0:0:0:0:0:0:0:0]:9209]:

Server returned HTTP response code: 503 for URL:  
http://[0:0:0:0:0:0:0:0]:9209/\_template/marvel

[2015-02-17 10:45:34,660][ERROR][marvel.agent.exporter] [Tommy] could  
not connect to any configured elasticsearch

Thank you  
Ali

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 12:32am UTC](https://discuss.elastic.co/t/java-lang-nullpointerexception-error-after-copy-plugin-and-no-known-master-node/22211/2 "2017-07-06T00:32:09Z")

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Closed on July 6, 2017, 12:32am UTC