require 'xmlsimple' broken puppetserver if xml-simple version 1.1.9 is installed

[sharewax]

after setup new puppet server we receive errors in /var/log/messages like:
/opt/puppetlabs/server/data/puppetserver/jruby-gems/gems/rexml-3.2.5/lib/rexml/parsers/baseparser.rb:108: warning: already initialized constant DEFAULT_ENTITIES

https://github.com/maik/xml-simple FAQ

Answer: The reason for this is, that you’re using XmlSimple explicitly in a rails app. XmlSimple is part of rails (you can find it in ./actionpack-1.12.5/lib/action_controller/vendor/xml_simple.rb). Unfortunately, the library is named "xml_simple.rb" and not "xmlsimple.rb". Ruby’s "require" prevents you from loading a library two times and it does so by checking if a file name occurs more than once. In your case somewhere in the rails framework "require 'xml_simple'" is performed and you run "require 'xmlsimple'" afterwards. Hence, the library is loaded twice and all constants are redefined.

A solution is to only require xml-simple unless XmlSimple has not been defined already.

Also the worst thing is:
ERROR [qtp222747617-2185] [puppetserver] Puppet Could not autoload puppet/parser/functions/clickhouse_config: load error: rexml/document -- java.lang.StackOverflowError: null

ERROR [qtp222747617-2185] [puppetserver] Puppet Evaluation Error: Error while evaluating a Resource Statement, Evaluation Error: Error while evaluating a Function Call, Could not autoload puppet/parser/functions/clickhouse_config: load error: rexml/document -- java.lang.StackOverflowError: null (file: /etc/puppetlabs/code/environments/production/modules/cluster/manifests/user.pp, line: 149, column: 24) (file: /etc/puppetlabs/code/environments/production/modules/cluster/manifests/init.pp, line: 31) on node xxxx.be.core.pw

currently we downgraded xml-simple to 1.1.8, but I suppose that require 'xmlsimple' should be changed to something different in lib/puppet/parser/functions/clickhouse_config.rb