Upgrade from 5.0.8 to 6.0.3

[Arie (Arie van den Heuvel)]

This is Out of my knowledge, but what comes into mind id if you are pointing to system java or build in graylog java in your configs.

Java version issue?

Before you post: Your responses to these questions will help the community help you. Please complete this template if you’re asking a support question. Don’t forget to select tags to help index your topic! 1. Describe your incident: After upgrading Graylog-server to version 5.0.2 using yum, graylog service will not start, the /varlog/messages shows the following error message: Exception in thread “main” java.lang.UnsupportedClassVersionError: org/graylog2/bootstrap/Main has been compiled b…