Java engineer development?

Question

Java

Hey! I'm 33 and would like to dive into Java system maintenance/automation.
At work, I am currently engaged in the maintenance / development of Teamcity, Youtrack, Atlassian products.
At the same time I am learning Java programming. It's going badly, to be honest.
I am faced with setting up a heap, monitoring via jmx.
What technologies should you pay attention to? What knowledge is required from a Java engineer?

Answer 1

For the most part, java is a web application, so you need to understand how they run and be able to configure the appropriate services.
Understand application servers - in practice, you need to be able to write a simple web application and run it under tomcat, deal with the settings in tomcat and configure https accordingly. At the same time and with certificates to understand. In the future, you can complicate your helloworld by adding authorization, redirection, authorization by certificates and Tomcat optimization.
How good is everything with Linux? simple bash scripting and raising the whole park under Linux? If there is no experience (teamcity often spins under Windows), then learn how to lift all this under Linux, both teamcity, and tomcat.
In addition to Tomcat, you can then look at other application servers (Tomcat is one of the simplest, which has almost everything you need for an enterprise), it makes sense to look at other servers if you use another one.

Answer 2

What knowledge is required from a Java engineer?

There are few employers on the Toaster, even fewer associated with Java - a specific technology.
It is better to search for the answer to your question on job / freelance sites for the relevant search queries.