If there is nothing going into the application or application-server logs, then you need to be asking why the operating system is killing the processes.
I think it's far more likely that there are logs that can tell you what the crash is, but you don't know where to look. Two places to check
First, look at the logs in <confluence data>/logs - the most important one is atlassian-confluence.log - that will tell you if and why Confluence is failing. But check all the latest logs in there, sometimes it's something critical in one of the sub-systems that the other logs are logging.
Then look at the logs in <confluence install>/log - again, the main one is Catalina.out - that's the main Tomcat log which may tell you if/why Tomcat is failing (but also look at the others in there)
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.