NetBeans 8.0.2
1) Create class
package bug21232375;

public class Class3 {
    void test() {
        class LocalClass {
            String _s;

            LocalClass() {
                this("Hello World!");
            }

            LocalClass(String s) { //#12
                _s = s;
            }

            void saySomething() {
                System.out.println(_s);
            }
        }

        new LocalClass("Hello World!").saySomething();
        LocalClass lc = new LocalClass("Hi");
        lc.saySomething();
    }


}

2) Right click in LocalClass(String s) constructor signature, line 12

3) Refactor->Replace Constructor With Factory...

This lead to:
Module Java Refactoring threw java.lang.NullPointerException. Please report a bug against Java Refactoring module and attach your var/log/messages.log.
and 
refactoring is not performed