Peter is the former President of the New Zealand Open Source Society. He is currently working on Business Workflow Automation, and is the core maintainer for Gravity Workflow a GPL workflow engine.
Java is a pretty broad field. It also doesn't exist in a vacuum. Here are some other common technologies which you should look at if you want to write server side apps.
SpringBoot & Spring Security (or other REST framework)
JUnit (Testing)
SQL or other DB, including ORMs (Data Storage)
Git (Source Code Version Control)
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Java is a pretty broad field. It also doesn't exist in a vacuum. Here are some other common technologies which you should look at if you want to write server side apps.