Product Version: NetBeans IDE Dev (Build 201606020002)
Java: 1.8.0_92; Java HotSpot(TM) 64-Bit Server VM 25.92-b14
Runtime: Java(TM) SE Runtime Environment 1.8.0_92-b14
System: Windows 10 version 10.0 running on amd64; Cp1252; en_CA (nb)
User directory: C:\Users\Gili\AppData\Roaming\NetBeans\dev
Cache directory: C:\Users\Gili\AppData\Local\NetBeans\Cache\dev

1. Given a Maven project that depends on:

        <dependency>
            <groupId>org.assertj</groupId>
            <artifactId>assertj-core</artifactId>
            <version>3.4.1</version>
        </dependency>

2. Create the following class:

public class NewClass {

    public static void main(String[] args) {
        assertThat("foo").isEqualTo("bar");
    }
}

3. Trigger "Fix All Imports"
4. The combo-box will contain 20-30 duplicates per possible combination of "assertThat".

My guess is that Netbeans is generating one entry per method signature. I am expecting it to generate a single entry per method name, regardless of the method signature.