Great question, Amanda!
Yes, we have recently stopped supporting JRE 6. A majority of our customers are now using JRE 7 or 8, and both versions will work for Ananplan Connect or other Anaplan APIs.
If Anaplan Connect no longer works, we would like you to upgrade to JRE 8. Need instructions? There are some available on Anapedia and here is the download detail from Oracle.
If you have JRE 7, it will continue to work. However, Oracle has stopped making updates and security patches available publicly (i.e., unless you have purchased a Java support package), we strongly encourage you to upgrade to JRE 8.
If you have any additional questions regarding this change, please let us know.