Probably the right tool to resolve what is going on there is jstack, a thread dumping utility in Java. To use (if jstack is on your path. otherwise would be in jdk/bin/ ), you can type:
jstack -l 1704 > C:\Users\You\MangoStuff\stack-1704
jstack -l 1220 > C:\Users\You\MangoStuff\stack-1220
It could also be useful to know which is the parent PID, if one is the parent pid of the other (maybe you have two Java processes, maybe you have started two instances of Mango on different ports). It looks like you can get PPID numbers via this command at the command prompt:
wmic process where (processid=1704) get parentprocessid
My only familiarity with causing these forks to happen and hang uses Process Event Handlers, so if you have some I will invariably ask something about if that script runs and works.