[midPoint-git] [Evolveum/midpoint] 907f71: Make ExpressionFactory thread-safe

[mederly]

  Branch: refs/heads/support-4.1
  Home:   https://github.com/Evolveum/midpoint
  Commit: 907f716d39bd2c4efda0cd33525342e206587fad
      https://github.com/Evolveum/midpoint/commit/907f716d39bd2c4efda0cd33525342e206587fad
  Author: Pavol Mederly <mederly at evolveum.com>
  Date:   2020-08-25 (Tue, 25 Aug 2020)

  Changed paths:
    M repo/repo-common/src/main/java/com/evolveum/midpoint/repo/common/expression/ExpressionFactory.java

  Log Message:
  -----------
  Make ExpressionFactory thread-safe

This is an approximate solution to MID-6432.
(100% solution would require immutability of the cache keys.)