RFR: 8302819: Remove JAR Index

[Eirik Bjorsnos]

On Thu, 23 Mar 2023 15:31:31 GMT, Eirik Bjorsnos <duke at openjdk.org> wrote:

> Do you know if the `jar` tool allows running with a `SecurityManager`? If not, we could perhaps simply use `System.getProperty`?

I ended up feeling opimistic and replaced the current code with just `System.getProperty`. If that is any concern doing that, let me know and I can use `AccessController` instead.

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PR Comment: https://git.openjdk.org/jdk/pull/13158#issuecomment-1481727128