Phillip Webb 11b1318cad Reduce GC pressure in JAR handler
Update the JAR `Hander` so that URL `startsWith` checks produce less
garbage. Comparisons are now performed first on the `path` rather than
the full `toString`. URL `toString` operations produce quite a lot of
garbage since a `StringBuilder` is always used.

In addition, we now also cache the JarFile URL toString to save repeated
calculation.

Closes gh-14561
2018-09-20 22:33:19 -07:00
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2018-09-20 22:33:19 -07:00