# Invalid Configuration class specified on Upgrade to 5.1.2 **URL:** \ **Category:** Elasticsearch\ **Created:** [January 24, 2017, 11:34am UTC](https://discuss.elastic.co/t/invalid-configuration-class-specified-on-upgrade-to-5-1-2/72623 "2017-01-24T11:34:21Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![CharliesL](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@CharliesL](https://discuss.elastic.co/u/CharliesL)\ **Post date:** [January 24, 2017, 11:34am UTC](https://discuss.elastic.co/t/invalid-configuration-class-specified-on-upgrade-to-5-1-2/72623/1 "2017-01-24T11:34:21Z")
Hi, I've just tried to upgrade from 5.0.1 to 5.1.2 using the rpm. I did rpm -i --force elasticsearch-5.1.2.rpm (i hope that is correct) But then when trying to start it up I get the following problem and cannot figure out why service elasticsearch status ● elasticsearch.service - Elasticsearch Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; disabled; vendor preset: disabled) Active: failed (Result: exit-code) since Tue 2017-01-24 11:28:32 GMT; 3s ago Docs: [http://www.elastic.co](http://www.elastic.co) Process: 14553 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID\_DIR}/elasticsearch.pid --quiet -Edefault.path.logs=${LOG\_DIR} -Edefault.path.data=${DATA\_DIR} -Edefault.path.conf=${CONF\_DIR} (code=exited, status=1/FAILURE) Process: 14551 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS) Main PID: 14553 (code=exited, status=1/FAILURE) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: Exception in thread "main" java.lang.IllegalArgumentException: Invalid Configuration class specified Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(Default...ava:193) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(Default...ava:157) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: at org.apache.logging.log4j.core.config.builder.impl.DefaultConfigurationBuilder.build(Default...java:54) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: at org.elasticsearch.common.logging.LogConfigurator.configureStatusLogger(LogConfigurator.java:125) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: at org.elasticsearch.common.logging.LogConfigurator.configureWithoutConfig(LogConfigurator.java:67) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) elasticsearch[14553]: at org.elasticsearch.cli.Command.main(Command.java:85) Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) systemd[1]: Unit elasticsearch.service entered failed state. Jan 24 11:28:32 [es5-mv01.intranet.net](http://es5-mv01.intranet.net) systemd[1]: elasticsearch.service failed. Hint: Some lines were ellipsized, use -l to show in full. ---
**Author:** ![jasontedor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jasontedor/32/66992_2.png) [@jasontedor](https://discuss.elastic.co/u/jasontedor)\ **Post date:** [January 24, 2017, 12:09pm UTC](https://discuss.elastic.co/t/invalid-configuration-class-specified-on-upgrade-to-5-1-2/72623/2 "2017-01-24T12:09:56Z")
> [@CharliesL](#): > > I've just tried to upgrade from 5.0.1 to 5.1.2 using the rpm. > > I did rpm -i --force elasticsearch-5.1.2.rpm(i hope that is correct) No, it's not correct, and I suspect that's the source of your problem. To upgrade, you should do `rpm -U` or `rpm --upgrade`. I suspect that you have conflicting JARs lying around. I think at this point you want to uninstall and reinstall (perhaps even checking that `/usr/share/elasticsearch/lib` is completely empty between uninstalling and installing. ---
**Author:** ![CharliesL](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@CharliesL](https://discuss.elastic.co/u/CharliesL)\ **Post date:** [January 24, 2017, 12:10pm UTC](https://discuss.elastic.co/t/invalid-configuration-class-specified-on-upgrade-to-5-1-2/72623/3 "2017-01-24T12:10:52Z")
Yep I thought it was the cause. Have now rolled back and done the it with the upgrade command and it's working now. Thanks! ---
**Author:** ![jasontedor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jasontedor/32/66992_2.png) [@jasontedor](https://discuss.elastic.co/u/jasontedor)\ **Post date:** [January 24, 2017, 12:29pm UTC](https://discuss.elastic.co/t/invalid-configuration-class-specified-on-upgrade-to-5-1-2/72623/4 "2017-01-24T12:29:17Z")
You're welcome. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [February 21, 2017, 12:29pm UTC](https://discuss.elastic.co/t/invalid-configuration-class-specified-on-upgrade-to-5-1-2/72623/5 "2017-02-21T12:29:51Z")
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