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http://stackoverflow.com/questions/5322632/spring-expression-language-spel-with-value-dollar-vs-hash-vs

${...} is the property placeholder syntax. It can only be used to dereference properties.

#{...} is SpEL syntax, which is far more capable and complex. It can also handle property placeholders, and a lot more besides.

Both are valid, and neither is deprecated.

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【半角英字】^[a-zA-Z]+$
abcdefghijklmnopqrstuvwxyz
【半角数字】^[0-9]+$
0-9
【半角記号】^[ -/:-@\[-\`\{-\~]+$
半角空白!”#$%&’()*+-.,/:;<=>?@[\]^_`{|}~
【半角英数字】^[a-zA-Z0-9]+$
abcdefghijklmnopqrstuvwxyz0123456789
【半角英数字記号】^[a-zA-Z0-9 -/:-@\[-\`\{-\~]+$
abcdefghijklmnopqrstuvwxyz0123456789半角空白!”#$%&’()*+-.,/:;<=>?@[\]^_`{|}~

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@VisibleForTesting


com.google.common.annotations

4つ提供されていますが、普段使いできそうなのは1つかな。
VisibleForTestingは、メソッドやフィールドに付与するもので、テストをしやすくするためにアクセス修飾子のレベルを緩くしているということを明示するために付与する。テストのためにprivateをパッケージプライベートに変更したりってことはよくするので、このアノテーションを利用するのはよさそう。

参照：　http://d.hatena.ne.jp/mtoyoshi/20100725/1280040233

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[hogehoge@ ~]$ sudo /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[hogehoge@ ~]$ sudo /usr/local/nginx/sbin/nginx -s reload

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+        location ~ /apple-touch-icon(|-\d+x\d+)(|-precomposed).png {
+            return 204;
+            log_not_found off;
+        }

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2013-03-12T17:29:32.875+0900: [GC [ParNew: 105726K->658K(118016K), 0.0036680 secs] 940860K->835893K(1035520K), 0.0038120 secs] [Times: user=0.04 sys=0.00, real=0.01 secs] 
2013-03-12T17:29:33.937+0900: [GC [ParNew (promotion failed): 105618K->105610K(118016K), 0.0631610 secs][CMS: 835245K->259864K(917504K), 1.8827850 secs] 940853K->259864K(1035520K), [CMS Perm : 53618K->53373K(83968K)], 1.9461600 secs] [Times: user=1.98 sys=0.02, real=1.94 secs] 
2013-03-12T17:29:35.952+0900: [GC [ParNew: 104960K->4540K(118016K), 0.0079190 secs] 364824K->264404K(1035520K), 0.0080600 secs] [Times: user=0.07 sys=0.00, real=0.01 secs] 
2013-03-12T17:29:36.076+0900: [GC [ParNew: 109500K->4641K(118016K), 0.0096710 secs] 369364K->264505K(1035520K), 0.0098120 secs] [Times: user=0.03 sys=0.00, real=0.01 secs] 

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[
  {
    "data": "JP",
    "key": "test"
  },
  {
    "data": "TH",
    "key": "test"
  }
]

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public class TestClass{
	private String generateToken(){
		MessageDigest md;
		try {
			md = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			// coding error.
			LOGGER.error("codeing error. ", e);
			throw new RuntimeException(e);
		}

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https://github.com/robbyrussell/oh-my-zsh
http://qiita.com/mollifier/items/0b618f9e969193ccf5c8
https://github.com/zsh-users/antigen