Comparison operation error -------------------------- Key: DROOLS-1167 URL: https://issues.jboss.org/browse/DROOLS-1167 Project: Drools Issue Type: Bug Affects Versions: 6.4.0.Final Environment: OracleLinux 6, Java 7/8 Reporter: Pierangelo Repetti Attachments: failing_rule.drl I migrated a set of rules from version 5.4 to 6.3. All rules are "Technical rules". After migration, I get the following error _Unable to Analyse Expression value != 0: [Error: Comparison operation requires compatible types. Found class org.mvel2.util.MethodStub and class java.lang.Integer] [Near : {... value != 0 ....}] ^ [Line: 29, Column: 9] _ on the following line of a rule _$imponibile : RuleElement(label=="IMPONIBILE", value != 0, imponibile : value, imponibile_artmap : artmap);_ RuleElement is a model class (loaded as a dependency) and declares a value attribute like _private Double value;_ The same rule compiled without problems in 5.4. Thanks