I can't type curly braces in Eclipse

The problem is with the skip breakpoints option. After unbinding the Alt+B key command, try to unbind the Ctr+Alt+B (skip brakepoints).

This solved my problem. If you try to type the "{" you can see the skip breakpoint option flashing.

Go Windows-> Preferences type in search field 'binding' click on Keys, look up for Alt+B, click on it and then click Unbind Command.