RFR: 8300977: Retire java.io.ExpiringCache

[Per Minborg]

On Tue, 24 Jan 2023 14:02:26 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposed to retire the class 'java.io.ExpiringCache'. The use of the class has been off by default since Java 16 but could be explicitly turned on by means of two System properties.

src/java.base/share/classes/java/io/FileSystem.java line 253:

> 251: 
> 252:     static {
> 253:         infoPropIsIgnored("sun.io.useCanonCaches");

I am not sure we should warn. If we should, there might be a better way to do it?

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PR Review Comment: https://git.openjdk.org/jdk/pull/12167#discussion_r1085371871