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Why is it not possible to extend annotations in Java?
...se: @Target(ElementType.ANNOTATION_TYPE) @Retention(RetentionPolicy.RUNTIME) @interface C {}; @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) @C public @interface F {} class a{ @F public void S() {} } @Test public void blahTes...
Debug code-first Entity Framework migration codes
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@Talon Go grab a coffee and by the time you're back probably another Visual Studio instance popped up. :)
– Corstian Boerman
Jun 17 '14 at 8:40
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Understanding Apache's access log
... reliable)
%u is the user name determined by HTTP authentication
%t is the time the request was received.
%r is the request line from the client. ("GET / HTTP/1.0")
%>s is the status code sent from the server to the client (200, 404 etc.)
%b is the size of the response to the client (in bytes)
Re...
How to convert AAR to JAR
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I had a hard time finding out how to extract it on mac, in case others too: just change .aar to .zip and double click!
– Bastien Beurier
Jan 29 '15 at 23:16
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X-Frame-Options Allow-From multiple domains
...use it in old or new projects. Pages or Web apps using it may break at any time.
The modern alternative is the Content-Security-Policy header, which along many other policies can white-list what URLs are allowed to host your page in a frame, using the frame-ancestors directive.
frame-ancestors sup...
Using curl POST with variables defined in bash script functions
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Thanks a lot @pbaranski you saved lot of my time
– sudhir tataraju
Oct 17 '19 at 14:08
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How to “pretty” format JSON output in Ruby on Rails
...ommend to use it in production.rb. The JSON reparsing may degrade response time and throughput of your production app. Eventually extra logic such as 'X-Pretty-Json: true' header may be introduced to trigger formatting for manual curl requests on demand.
(Tested with Rails 3.2.8-5.0.0, Ruby 1.9.3-2...
Android AsyncTask threads limits?
I am developing an application where I need to update some info every time user logs in to the system, I also use database in the phone. For all those operations (updates, retrieving data from db and etc.) I use async tasks. As up till now I didn't see why I shouldn't use them, but recently I experi...
When is SQLiteOpenHelper onCreate() / onUpgrade() run?
...le so that onCreate() is run again. This is often preferred at development time where you have control over the installed versions and data loss is not an issue. Some ways to delete the database file:
Uninstall the application. Use the application manager or adb uninstall your.package.name from th...
The performance impact of using instanceof in Java
...th wrote, "We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil." The performance of instanceof probably won't be an issue, so don't waste your time coming up with exotic workarounds until you're sure that's the problem.
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