# Elasticsearch connection getting disconnected.. No node available.. Java client.. ES 1.7.3 ..Single node **URL:** \ **Category:** Elasticsearch\ **Created:** [February 3, 2016, 7:04am UTC](https://discuss.elastic.co/t/elasticsearch-connection-getting-disconnected-no-node-available-java-client-es-1-7-3-single-node/40829 "2016-02-03T07:04:15Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![jaykrik](https://avatars.discourse-cdn.com/v4/letter/j/ba8739/32.png) [@jaykrik](https://discuss.elastic.co/u/jaykrik)\ **Post date:** [February 3, 2016, 7:04am UTC](https://discuss.elastic.co/t/elasticsearch-connection-getting-disconnected-no-node-available-java-client-es-1-7-3-single-node/40829/1 "2016-02-03T07:04:15Z")
Apache-tomcat - 7.0.65 Elasticsearch - 1.7.3 - no plugins installed Java - 1.7.0\_80 Java client connection properties given elasticsearch.address=127.0.0.1 elasticsearch.port=9300 elasticsearch.writerThread=10 elasticsearch.readerThread=10 elasticsearch.clusterName=mystores Elasticsearch is not clustered, zen multicast disabled, Nodename is hostname(taken from environment variable). ## Issue : Elasticsearch connection gets lost and tomcat starts throwing the following error continuously ## 2016-02-02 18:59:52,279 [pool-1-thread-5] INFO com.clogic.eventstore.es.ESEventDataStore - disconnected client instance closed 2016-02-02 18:59:52,289 [pool-1-thread-5] INFO org.elasticsearch.plugins - [Doctor Strange] loaded [], sites [] 2016-02-02 18:59:52,309 [pool-1-thread-5] INFO com.clogic.eventstore.es.ESEventDataStore - new client created 2016-02-02 18:59:52,309 [pool-1-thread-5] INFO com.clogic.eventstore.es.ESWriter - exception e org.elasticsearch.client.transport.NoNo deAvailableException: None of the configured nodes are available: [] 2016-02-02 18:59:52,310 [pool-1-thread-10] INFO com.clogic.eventstore.es.ESEventDataStore - no connected ES client. creating a new one now 2016-02-02 18:59:52,315 [pool-1-thread-10] INFO com.clogic.eventstore.es.ESEventDataStore - disconnected client instance closed 2016-02-02 18:59:52,324 [pool-1-thread-10] INFO org.elasticsearch.plugins - [Hermes] loaded [], sites [] 2016-02-02 18:59:52,344 [pool-1-thread-10] INFO com.clogic.eventstore.es.ESEventDataStore - new client created 2016-02-02 18:59:52,344 [pool-1-thread-10] INFO com.clogic.eventstore.es.ESWriter - exception e org.elasticsearch.client.transport.NoN odeAvailableException: None of the configured nodes are available: [] 2016-02-02 18:59:52,344 [pool-1-thread-7] INFO com.clogic.eventstore.es.ESWriter - exception e org.elasticsearch.client.transport.NoNo deAvailableException: None of the configured nodes are available: [] One point noted here is, it seems the node name to which the Java client tries to connect changes for every attempt. The connection issue does not start after a specific time,it gets lost randomly after tomcat is started and client tries to reconnect. This is also sometimes successful, but after some time the above error is continuously thrown until tomcat is restarted. ## Also, even at startup the node name shown is random, but it works as shown below ## 2016-02-02 19:05:30,528 [localhost-startStop-1] INFO com.clogic.eventstore.es.ESEventDataStore - no connected ES client. creating a ne w one now 2016-02-02 19:05:30,669 [localhost-startStop-1] INFO org.elasticsearch.plugins - [John Doe] loaded [], sites [] 2016-02-02 19:05:31,666 [localhost-startStop-1] INFO com.clogic.eventstore.es.ESEventDataStore - new client created Any input is appreciated.. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 11:19pm UTC](https://discuss.elastic.co/t/elasticsearch-connection-getting-disconnected-no-node-available-java-client-es-1-7-3-single-node/40829/2 "2017-07-05T23:19:20Z")