Comment 10 for bug 680370

Indeed, apologies there. I was also missing the source plugin:

            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>

I generally develop in IntelliJ IDEA and was checking classpaths from there so I didn't catch that.

The other problem is really weird. At runtime in my environment, the class name of the second parameter shows up as "c.m.q.t.Expr" (instead of "Expression"). Somehow the name of the class is being mangled. I don't believe it has anything to do with Querydsl, sorry for the noise.