I admit OP's question is a little vague, but as someone who hasn't touched Java in a while, I appreciate it. True, the answers are just as vague as the question

I admit OP's question is a little vague, but as someone who hasn't touched Java in a while, I appreciate it. True, the answers are just as vague as the questions, but to someone who is familiar with Java and not the frameworks for web development it does enumerate the options that can be explored