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JColorChooser RGB Rounding Issue in Java 21 on macOS

Summary

When using JColorChooser.showDialog with colorTransparencySelectionEnabled=false in Java 21 on macOS, RGB values in the range 0-64 are rounded down by 1 (e.g., 51/51/51/255 → 50/50/50/255), and values in 65-127 show inconsistent rounding (odd values match, even values are decremented by 1). This issue does not occur when colorTransparencySelectionEnabled=true or when using JColorChooser.createDialog with explicit JColorChooser instance management and the sequence of setColorTransparencySelectionEnabled(false) followed by setColor.

This document describes the issue, provides steps to reproduce, and outlines a workaround.

Environment

Java: 21.0.7 LTS
OS: macOS

ハード

$ system_profiler SPHardwareDataType|grep "Chip\|Memory"
      Chip: Apple M1
      Memory: 16 GB

brewでollamaをインストール

$ brew install ollama

ハード

$ system_profiler SPHardwareDataType|grep "Chip\|Memory"
      Chip: Apple M1
      Memory: 16 GB

brewでollamaをインストール

$ brew install ollama

ハード

$ system_profiler SPHardwareDataType|grep "Chip\|Memory"
      Chip: Apple M1
      Memory: 16 GB

brewでollamaをインストール

$ brew install ollama

	# %%
	import numpy as np
	from collections import Counter
	import matplotlib.pyplot as plt

	import matplotlib
	import matplotlib.font_manager as fm
	prop = fm.FontProperties(fname='/System/Library/Fonts/ヒラギノ角ゴシック W3.ttc')
	prop.set_weight = 'normal'
	matplotlib.rcParams['font.family'] = prop.get_name()

	# %%
	import urllib.parse as u
	s = "https://zenn.dev/toropippi/articles/d8def1c994e0a9#:~:text=そんなことを知らず、自作Shaderで sin(time * x) のように書きまくってましたけどね・・ "
	print(s if ":~:text=" not in s else (x := s.strip().split(":~:text=", 1))[0]+":~:text="+u.quote(x[1]))

	import bpy
	import bmesh
	from mathutils import Vector
	import math

	# タイル参考情報 https://tilingpackingcovering.web.fc2.com/abstract.html

	# code by Grok ここから

	# %%
	import numpy as np
	import matplotlib.pyplot as plt
	from matplotlib.collections import PolyCollection
	from sklearn.decomposition import PCA
	from scipy.spatial import Voronoi
	from scipy.spatial import ConvexHull
	import colorsys

	// clang -fobjc-arc -framework Foundation lockfile.m -o lockfile
	#import <Foundation/Foundation.h>

	int main(int argc, const char * argv[]) {
	@autoreleasepool {
	// ロックファイルのパス
	NSString *lockFilePath = @"/tmp/lockfile";

	// NSFileManagerのインスタンス
	NSFileManager *fileManager = [NSFileManager defaultManager];

	# %%
	def morse2Dot(in_filename, out_filename):
	ROOT_LABEL = '(start)'
	ROOT_CODE = 'START'
	DUMMY = 'dummy'
	DOT_SHAPE = 'shape=circle'
	BAR_SHAPE = 'shape=rectangle'
	ROOT_SHAPE = 'shape=diamond'
	PROP_LINES = '\n\trankdir=TB;\n\tnodesep=0.5;\n\tpad=0.2;'
	DUMMY_NODE_ATTR = ', label="(N/A)", margin=0'