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How do servlets work? Instantiation, sessions, shared variables and multithreading
...afety
That said, your major concern is possibly thread safety. You should now know that servlets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (read: HTTP requests) can make use of the same instance. It would otherwise be too e...
Convert a series of parent-child relationships into a hierarchical tree?
...dilemma" for outputting an array. The dilemma is, that each item does not know whether or not children will follow up or how many preceding elements need to be closed. In another answer I already solved that by using a RecursiveIteratorIterator and looking for getDepth() and other meta-information t...
What is the difference between the Data Mapper, Table Data Gateway (Gateway), Data Access Object (DA
...ulate the database logic for a specific entity so the calling code has no knowledge of the underlying persistence layer. From my brief research all of them typically implement your standard CRUD methods and abstract away the database-specific details.
...
How to pull request a wiki page on GitHub?
...i repo
push your changes to GitHub
Once you are ready to let the author know you have changes, do the following:
open an issue on OREPO
provide a direct link to your wiki's git repo for ease of merging:
i.e. [FREPO].wiki.git
Merging Changes
As the owner of OREPO, you have now received a messa...
Using Spring MVC Test to unit test multipart POST request
...er for saving autos. I have verified that this works when I use e.g. cURL. Now I want to unit test the method with Spring MVC Test. I have tried to use the fileUploader, but I am not managing to get it working. Nor do I manage to add the JSON part.
...
Spring RestTemplate - how to enable full debugging/logging of requests/responses?
...
We have been using this technique for about 3 months now. It only works with RestTemplate configured with a BufferingClientHttpResponseWrapper as @sofienezaghdoudi implies. However, it does not work when used in tests using spring's mockServer framework since MockRestServiceS...
java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...e theory behind cursors and how JDBC should be used. If you don't need to know the background, you can skip this and go straight to 'Eliminating Leaks'.
What is a cursor?
A cursor is a resource on the database that holds the state of a query, specifically the position where a reader is in a Result...
MySQL order by before group by
...publish', post_type='post', post_author='user A', post_date='2012-12-31')
Now, when you order the results of the grouping by post_date, you get the data you wanted.
SELECT wp_posts.*
FROM wp_posts
WHERE wp_posts.post_status='publish' AND wp_posts.post_type='post'
GROUP BY wp_posts.post_author DESC...
Dependency Inject (DI) “friendly” library
...eed a short-lived object, or to construct the dependency based on a value known only at run-time.
See this for more information.
Compose only at the Last Responsible Moment
Keep objects decoupled until the very end. Normally, you can wait and wire everything up in the application's entry point. T...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...elimited("cork app bug 2\n");
err = -EINVAL;
goto out;
}
/*
* Now cork the socket to pend data.
*/
fl4 = &inet->cork.fl.u.ip4;
fl4->daddr = daddr;
fl4->saddr = saddr;
fl4->fl4_dport = dport;
fl4->fl4_sport = inet->inet_sport;
up->pending = AF_INET; //标记，表明正在...