See this project, which is based on the standard Sample.drl of the Drools Eclipse plugin: https://github.com/DuncanDoyle/DroolsConditionalNamedConsequenceIssue

As you can see in the 'src/main/resources/rules/Sample.drl', the first rule, which is commented out, uses an MVEL expression in the conditional 'if' statement, i.e. "if (m.status == Message.HELLO) break [sayHello]". The compiler throws this error:

Rule Compilation error The field DroolsTest.Message.status is not visible.

When I use a Java dialect and define the conditional if as " if (m.getStatus() == 0) break [sayHello]", as shown in the second rule everything works fine.

Note that there is also an issue with using public constants in the condition, but I'll open another JIRA for that issue.