[rules-users] traits - don more than 3 pojos, got IllegalArgumentException

[Michal Bali]

Hi all,

I came across this issue when trying out 'traits' with POJOs (not declared
types). An IllegalArgumentException is being thrown when I apply the third
'don'. Here is how to reproduce:
as the POJO I am using the Message class that comes with the project
created by the Eclipse plugin.
now the rule file:

declare Message
  @Traitable

end

declare NiceMessage
  @format(trait)

end

rule load
    when

    then
        Message message = new Message();
        message.setMessage("Hello World");
        insert(message);
        don(message, NiceMessage.class);

        Message unreadMessage = new Message();
        unreadMessage.setMessage("unread");
        insert(unreadMessage);
        don(unreadMessage, NiceMessage.class);

        Message oldMessage = new Message();
        oldMessage.setMessage("old");
        insert(oldMessage);
        System.out.println("don " + oldMessage);
        don(oldMessage, NiceMessage.class); //*<--- exception happens here*
        System.out.println("wont reach this point");
end

When I run this and rule 'load' fires the third 'don' will throw the
following exception:

Exception executing consequence for rule "load" in com.mycompany.app:
java.lang.IllegalArgumentException: argument type mismatch
    at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
    at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
    at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
    at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
    at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:709)
    at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:673)
    at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:221)
    at com.mycompany.app.DroolsTest.main(DroolsTest.java:44)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
    at
org.drools.factmodel.traits.TraitFactory.getProxy(TraitFactory.java:92)
    at
org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:502)
    at
org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:522)
    at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8.defaultConsequence(Rule_load_86ecf966a4c14d8486844cfae2e1e0d8.java:21)
    at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
    at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8DefaultConsequenceInvoker.evaluate(Unknown
Source)
    at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
    ... 6 more

Am I doing something wrong or is this a bug. I am running with 5.4.0.Beta2.

BTW traits are a great piece of functionality. Thank you!

Best regards,
Michal
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