Cannot use a field name starting with an underscore --------------------------------------------------- Key: DROOLS-554 URL: https://issues.jboss.org/browse/DROOLS-554 Project: Drools Issue Type: Bug Reporter: Mario Fusco Assignee: Mario Fusco Priority: Minor Trying to parse an expression using a field name starting with an underscore ('_') causing a compile time error like the following: Unable to Analyse Expression _id == "test": [Error: no such identifier: _id] [Near : {... _id == "test" ....}] ^ : [Rule name='R']