java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean

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Comparing integers in drools causes cast exception

java.lang.String cannot be cast to java.lang.Boolean

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean	at org.mvel2.ast.Negation.getReducedValueAccelerated(Negation.java:48)