Product Version = NetBeans IDE 8.1 (Build 201510222201)
Operating System = Windows 7 version 6.1 running on amd64
Java; VM; Vendor = 1.7.0_67
Runtime = Java HotSpot(TM) 64-Bit Server VM 24.65-b04

Reproducibility: Happens every time

STEPS:
Go to: Options - Editor - Formatting - Braces
Set the Class Declaration to Same Line

Create class as follows:

class reformatError // extends someOtherClass - no longer needed
{
    // here comes the class
}

Save the class or press Shift-Alt-F

ACTUAL:

source code is reformatted as: 

class reformatError // extends someOtherClass - no longer needed {
    // here comes the class
}

which is wrong - brace is at the end, it becomes part of the comment

EXPECTED:
source code should be reformatted as:

class reformatError { // extends someOtherClass - no longer needed
    // here comes the class
}