Product Version: NetBeans IDE 6.9 (Build 201007282301)
Java: 1.6.0_20; Java HotSpot(TM) Client VM 16.3-b01
System: Linux version 2.6.32-24-generic-pae running on i386; UTF-8; en_US (nb)

Having source:

package pkg;
public class NewClass {
    String foo;
    public NewClass(String s) {
        foo = s.
        String a;
    }
}

When you invoke CC on 's.|', select e.g. 'concat' from the list and commit with <semicolon> then you get broken source like:

    public NewClass(String s) {
        foo = s.concat(s)
        String; a;
             ^^^
    }