Compilations with long classpaths and many references to symbols in the classpath cause javac to make many calls to Files.exist, and for the cache in ArchiveContainer to retain a large number of entries.

see: http://mail.openjdk.java.net/pipermail/compiler-dev/2016-December/010596.html

Repro:

1) generate the test inputs

$ javac -cp asm.jar Test.java && java -cp asm.jar:. Test

2) compile

$ $JAVAC8 -fullversion
javac full version "1.8.0_122-ea-b04"
$ time $JAVAC8 @params.txt
real 0m17.385s
user 0m40.855s
sys 0m1.305s

$ $JAVAC9 -fullversion
javac full version "9-ea+148"
$ time $JAVAC9 @params.txt
real 8m40.530s
user 32m8.614s
sys 0m57.024s