1.18.4 introduced a breaking change for @FieldNameConstants. Generated fields are no longer prefix + fieldName + suffix and instead are generated as just fieldName inside an inner type.
After delombok i am seeing
public static final String nullFIELDnull = "field";
Generated strings should belong in inner type as
public final class Fields{
public static final String FIELD = "field";
}
See unit test from lombok repo.
Before:
https://github.com/rzwitserloot/lombok/blob/3d432c38d0cfeb36b8e7402eca56faaafcf7bac7/test/transform/resource/before/FieldNameConstantsBasic.java
IDEA Version: Build #IU-182.4892.20, built on October 16, 2018
JDK Version: JRE: 1.8.0_152-release-1248-b19 amd64
_What steps do we need to take to reproduce this issue?_
Simply use @FieldNameConstants with latest version of lombok.
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Still facing this problem. Feature is not useable. When it is planned to be fixed?
Are you going to fix it?
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I'm having this problem too, but with OpenJDK 11!
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I am still having the problem. Tried on versions 1.18.4, 1.18.5 and 1.18.6.

@vrosenshtein: this change will be available in the next release of plugin (version 0.24)
@mplushnikov do you know when 0.24 will be released? :) Thanks in advance!
@mplushnikov +1 for Tomasz, fix release would be really appreciated.
+1 also very interested in release date
I would appreciate know the release date please :)
It's released, if someone is still waiting.
Well, just installed 0.25-EAP onto IDEA 2019.1.2. The issue is still here if the lombok dependency is 1.18.4 or 1.18.6. If the lombok is 1.18.2, it's fine of 0.25-EAP (was not working on 0.24 - thanks).

You are right @schernov-xo . You need compatible lombok library for your code of couse.
@mplushnikov just realized that lombok 1.18.6 has another format of Fields class (instead of FIELD_ constants). Did not expect such change in a minor update (since 1.18.2). Seems to be working fine. Thanks!
Most helpful comment
@vrosenshtein: this change will be available in the next release of plugin (version 0.24)