Hi, the issue is this: https://issues.apache.org/jira/browse/PIVOT-855
but the strange thing is that I don't remember compilation errors with JDK 7 (maybe Oracle did some fix in one of latest Updates), but now even in my alternative dev environment (using Oracle JDK 7 Update 4) I have the same errors ... so it's not an issue related to the JDK 7 version used by Jenkins at Apache. So I'm thinking to take a look at this, even if it's targeted to 2.1 (and maybe for 2.0.3) ... I have to see if instead of two versions of remove methods (first method: remove(T) in Sequence, second method: remove(K) in Dictionary), if it's possible to make only one and split the behaviour inside ... Someone has objections to try to fix it before the 2.1 ? Sandro
