PROBLEM

The "Replace StringBuffer/Builder by String" hint breaks some code, when a StringBuilder-specific method is used.

PROBLEM EXAMPLE

This snippet of code produces a hint to replace the StringBuilder with a String:

    String str = "Hello World!";
    StringBuilder sb = new StringBuilder(str);
    sb.deleteCharAt(5);

When the suggested replacement is applied, the snippet is changed to this:

    String str = "Hello World!";
    String sb = str;
    sb.deleteCharAt(5);

But then a compile error arises, because, of course, sb.deleteCharAt() doesn't exist.

SUGGESTED CHANGE

The hint should be suppressed when a StringBuilder-specific method is used.

FURTHER INFORMATION

This bug looks like bug #239082.

Here are my system details, however, I don't think they have something to do with the bug.

Product Version: NetBeans IDE 8.1 (Build 201510222201)
Updates: NetBeans IDE is updated to version NetBeans 8.1 Patch 1
Java: 1.8.0_74; Java HotSpot(TM) 64-Bit Server VM 25.74-b02
Runtime: Java(TM) SE Runtime Environment 1.8.0_74-b02
System: Windows 10 version 10.0 running on amd64; UTF-8; nl_NL (nb)