# IncompatibleClassChangeError\[Implementing class\] **URL:** \ **Category:** Elasticsearch\ **Created:** [May 23, 2014, 2:54am UTC](https://discuss.elastic.co/t/incompatibleclasschangeerror-implementing-class/17684 "2014-05-23T02:54:12Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Olivier\_B](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/olivier_b/32/1422_2.png) [@Olivier\_B](https://discuss.elastic.co/u/Olivier_B)\ **Post date:** [May 23, 2014, 2:54am UTC](https://discuss.elastic.co/t/incompatibleclasschangeerror-implementing-class/17684/1 "2014-05-23T02:54:12Z")
Hey! I'm using Elasticsearch 1.1.1 on ubuntu on java 7: java version "1.7.0\_55" OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode) It's working perfectly. But, when I try to upgrade to 1.2.0, elasticsearch won't start: [2014-05-23 02:32:53,812][INFO][node] [Larry Bodine]version [1.2.0], pid[43], build[c82387f/2014-05-22T12:49:13Z] [2014-05-23 02:32:53,813][INFO][node] [Larry Bodine]initializing ... [2014-05-23 02:32:53,853][INFO][plugins] [Larry Bodine]loaded [cloud-aws, jetty, river-couchdb, lang-javascript], sites [bigdesk] [2014-05-23 02:32:56,655][INFO][node] [Larry Bodine]initialized [2014-05-23 02:32:56,655][INFO][node] [Larry Bodine]starting ... [2014-05-23 02:32:56,800][INFO][transport] [Larry Bodine]bound\_address {inet[/0:0:0:0:0:0:0:0:9300]}, publish\_address {inet[/172.17.0.2:9300]} [2014-05-23 02:32:59,846][INFO][cluster.service] [Larry Bodine] new\_master [Larry Bodine][QBC3No2hQYKosA-cz9Pfog][7c414f6cd187][inet[/172.17.0.2:9300]], reason: zen-disco-join (elected\_as\_master) [2014-05-23 02:32:59,895][INFO][discovery] [Larry Bodine] es-cluster/QBC3No2hQYKosA-cz9Pfog [2014-05-23 02:32:59,939][INFO][gateway] [Larry Bodine]recovered [0] indices into cluster\_state {1.2.0}: Startup Failed ... - IncompatibleClassChangeError[Implementing class] Any idea of what's happening? -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/91b5acc5-28bc-470c-badf-0729b8250235%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/91b5acc5-28bc-470c-badf-0729b8250235%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\ **Post date:** [May 23, 2014, 4:44pm UTC](https://discuss.elastic.co/t/incompatibleclasschangeerror-implementing-class/17684/2 "2014-05-23T16:44:56Z")
Not positive, but I would assume the issue is with one of your plugins. Try removing them and see if the problem persist and if it does, keep re-adding them one by one until you find the culprit. -- Ivan On Thu, May 22, 2014 at 7:54 PM, Olivier B [obierlai@gmail.com](mailto:obierlai@gmail.com) wrote: > Hey! > > I'm using Elasticsearch 1.1.1 on ubuntu on java 7: > > java version "1.7.0\_55" > OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1) > OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode) > > It's working perfectly. But, when I try to upgrade to 1.2.0, elasticsearch > won't start: > [2014-05-23 02:32:53,812][INFO][node] [Larry Bodine]version > [1.2.0], pid[43], build[c82387f/2014-05-22T12:49:13Z] > [2014-05-23 02:32:53,813][INFO][node] [Larry Bodine]initializing > ... > [2014-05-23 02:32:53,853][INFO][plugins] [Larry Bodine]loaded > [cloud-aws, jetty, river-couchdb, lang-javascript], sites [bigdesk] > [2014-05-23 02:32:56,655][INFO][node] [Larry Bodine]initialized > [2014-05-23 02:32:56,655][INFO][node] [Larry Bodine]starting > ... > [2014-05-23 02:32:56,800][INFO][transport] [Larry Bodine]bound\_address > {inet[/0:0:0:0:0:0:0:0:9300]}, publish\_address {inet[/172.17.0.2:9300]} > [2014-05-23 02:32:59,846][INFO][cluster.service] [Larry Bodine] > new\_master [Larry > Bodine][QBC3No2hQYKosA-cz9Pfog][7c414f6cd187][inet[/172.17.0.2:9300]], > reason: zen-disco-join (elected\_as\_master) > [2014-05-23 02:32:59,895][INFO][discovery] [Larry Bodine] > es-cluster/QBC3No2hQYKosA-cz9Pfog > [2014-05-23 02:32:59,939][INFO][gateway] [Larry Bodine]recovered > [0] indices into cluster\_state > {1.2.0}: Startup Failed ... > > - IncompatibleClassChangeError[Implementing class] > > Any idea of what's happening? > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/91b5acc5-28bc-470c-badf-0729b8250235%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/91b5acc5-28bc-470c-badf-0729b8250235%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/91b5acc5-28bc-470c-badf-0729b8250235%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/91b5acc5-28bc-470c-badf-0729b8250235%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQApagKyCQg-CDh25OEb9JKBGHrTZtpVjZndteevAyZ0vg%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQApagKyCQg-CDh25OEb9JKBGHrTZtpVjZndteevAyZ0vg%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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, 1:27am UTC](https://discuss.elastic.co/t/incompatibleclasschangeerror-implementing-class/17684/3 "2017-07-06T01:27:21Z")