Mention Java dependency in installation instructions

📚 The doc issue

torchserve apparently requires Java (and, in particular, Java 17) in order to run. However, neither the README nor the Getting Started doc describe this requirement.

The closest I can find about this requirement are the Win Native and WSL docs. But anyone running on Linux would have no reason to read those docs. Furthermore, links to those Windows-related docs seem sparse.

Suggest a potential alternative/fix

Mention the need for Java to be installed, including the expected version of Java and setting the JAVA_HOME environment variable, as part of the high level installation and getting started instructions.

[tpanza]

Thanks, @msaroufim Yes, I think the Java dependency is important enough to warrant mentioning up front in the README.

I suppose this is technically a separate issue, but the ts_scripts/install_dependencies.py does not appear to be a universal solution. For example, running apt-get install -y openjdk-17-jdk would not work for someone running on a RHEL-based distro.

[ozancaglayan]

I generally refrain from running dependency installer scripts unless I’m 100% sure what it does. So I think it’d be good to document all the steps performed in the install_deps also in the README file.