[rules-users] Memory leak in 5.2/5.3

[vadlam]

as suggested in his post by Thomas , we are retracting the facts from memory.
we are doing it in the finally block to make sure a rule session exception
does not leave the facts in memory .

for ex, we came across an incorrect regular expression  syntax within the
rules when using incorrect syntax .

java.util.regex.PatternSyntaxException: Illegal character range near index 7
^[A-Za-Z]+

retracting the facts in finally block fixes the leak .

That, besides making sure we are reusing the StatefulSession rather than
creating a new one every time.

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