Not yet, but I'm interested in Oracle user groups - Hungarian Oracle Users Group. It's a very nice local group, with frequent meetups, and knowledge sharing.
Yes - Java User Group in the Phoenix area. MySQL is good for staying on top of the curve in what's going on and how other people approach problems often encountered in the industry.
Yes - Java: awareness of new improvements in new versions. Most benefits are around Java features, but there is little content specific to MySQL in this interest group. Reactive programming techniques would provide better throughput when dealing with database access.
Not yet, but I'm interested in Oracle user groups - I want to be in the Java and MySQL group, because I'm a web and mobile developer and I use these technology in my projects.