Thanks for the reply, so far from documentation, I believe
"newInstance"=true(default) replaces the old kb as a whole and =false will
update the existing kb. But I didn't see anywhere explaining that if there
is a compilation error on rules, it will not update the kb. And I verified.
It updates the kb. I don't know if that is expected or bugs in this version.
Anyway, I found the workthrough by assigning the kb to the variable and
update it only if there is not resourceCompilationFailed using
knowledgeBaseUpdated event on KnowledgeAgentEventListener.
Anyway, thanks for your help.
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