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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
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@NotNull: The CharSequence, Collection, Map or Array object is not null, but can be empty.
@Not...
Ruby sleep or delay less than a second?
...h ruby that must render frames at 24 frames per second, but I need to wait 1/24th of a second between sending the commands. What is the best way to sleep for less than a second?
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git produces Gtk-WARNING: cannot open display
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edited Jun 27 '13 at 7:07
answered Apr 19 '13 at 12:19
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Eclipse - debugger doesn't stop at breakpoint
...e shoot a JUnit. In the source code, I have set break point in two places: 1) in a line where a static member is initialized 2) the first line of one of the test cases.
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SQL Server Management Studio won't let me add an index to a table
...ase, and refreshed and restarted SSMS, but no luck. I'm using SQL Server 2012 Business Intelligence SP1 CTP.
5 Answers
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How to restart a rails server on Heroku?
...hrc or .bash_aliases file as described at:
https://askubuntu.com/questions/17536/how-do-i-create-a-permanent-bash-alias and
Creating permanent executable aliases
Then you can just type hra app_name
You can restart a specific remote, e.g. "staging" with:
heroku restart -a app_name -r remote_name
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Django: reverse accessors for foreign keys clashing
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1 Answer
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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
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函数
属性
应用场景
1. 数据记录应用
2. MQTT 客户端
3. 食谱显示应用
4. 长时间运行的应用
5. 下载管理器
重要说明
权限要求
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How to var_dump variables in twig templates?
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14 Answers
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How to produce a range with step n in bash? (generate a sequence of numbers with increments)
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I'd do
for i in `seq 0 2 10`; do echo $i; done
(though of course seq 0 2 10 will produce the ...