There is a known bug with incremental kbase changes (what happens when drools.agent.newInstance=false) and declared types. Sometime ago someone mentioned a possible workaround. Try to search in the mailing list.

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On Tue, Feb 21, 2012 at 12:25 PM, Juanker Atina <juankera@gmail.com> wrote:
Hi there,

I want to work with declared facts, inside drl file, but when i set
drools.agent.newInstance property to false, it seems that drools won't work with this specific fact.


My code stops working when i put this two lines,

KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
aconf.setProperty("drools.agent.newInstance", "false");

And it works fine when i remove these lines.


So, I've read that this property is related to new instances of KnowledgeBase when resources changes...


c&p from: http://grepcode.com/file/repository.jboss.org/maven2/org.drools/drools-api/5.0.0.M4/org/drools/agent/KnowledgeAgentFactory.java

aconf.setProperty( "drools.agent.newInstance",
                          "true" ); // resource changes results in a new instance of the KnowledgeBase being built,
                                    // this cannot currently be set to false for incremental building


Hence, why is this property changing the behaviour of the rules?

(See this thread too,
http://drools.46999.n3.nabble.com/rules-users-Truth-maintenance-and-RHS-variables-tt3722632.html#a3731857)
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