When I try getting on my worlds or server a window pops up saying Java(TM) has stopped working and problem caused it to work incorrectly and takes me back to launcher.

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
to get on my world/server.
What actually happened was...:
Describe what happened here
game froze and a window pops up saying Java(TM) stopped working.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...go on launcher, edit profile, go on JMV arguement, and change 1 in Xmx 1G (begging) to another number. (Maybe)
g
3. ...go onto game and try getting on a world/server.