Please get checker-qual and error_prone_annotations to agree with caffeine...update your check-qual dependency to 2.6.0 and your error_prone_annotations dependency to 2.3.3, please.

    Require upper bound dependencies error for org.checkerframework:checker-qua>
        +-com.google.guava:guava:27.1-jre (managed) <-- com.google.guava:guava:>
          +-org.checkerframework:checker-qual:2.5.2
    and
        +-com.github.ben-manes.caffeine:caffeine:2.7.0
          +-org.checkerframework:checker-qual:2.6.0

    Require upper bound dependencies error for com.google.errorprone:error_pron>
        +-com.google.guava:guava:27.1-jre (managed) <-- com.google.guava:guava:>
          +-com.google.errorprone:error_prone_annotations:2.2.0
    and
        +-com.github.ben-manes.caffeine:caffeine:2.7.0
          +-com.google.errorprone:error_prone_annotations:2.3.3

public static final WithPublicConstants FIRST = new WithPublicConstants();
    
    @SuppressWarnings("unused")
    public static final WithPublicConstants SECOND = new WithPublicConstants();
  }
  private static class FirstConstantIsNull {
    
    @SuppressWarnings("unused")
    public static final FirstConstantIsNull FIRST = null;
    public static final FirstConstantIsNull SECOND = new FirstConstantIsNull();
  }
  public static class NonFinalFieldIgnored {
    public static NonFinalFieldIgnored instance = new NonFinalFieldIgnored();
    private NonFinalFieldIgnored() {}
  }
  public static class NonPublicConstantIgnored {
    static final NonPublicConstantIgnored INSTANCE = new NonPublicConstantIgnored();
    private NonPublicConstantIgnored() {}
  }
  public static class NonStaticFieldIgnored {
    
    public final NonStaticFieldIgnored instance = new NonStaticFieldIgnored();
    private NonStaticFieldIgnored() {}
  }
}