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What is a segmentation fault?
...
Segmentation fault is a specific kind of error caused by accessing memory that “does not belong to you.” It’s a helper mechanism that keeps you from corrupting the memory and introducing hard-to-debug memory bugs. Whenever you get a segfault you know you are doing somethin...
Increasing the maximum number of TCP/IP connections in Linux
...
Maximum number of connections are impacted by certain limits on both client & server sides, albeit a little differently.
On the client side:
Increase the ephermal port range, and decrease the tcp_fin_timeout
To find out the default values:
sysctl net.ipv4.ip_lo...
tomcat - CATALINA_BASE and CATALINA_HOME variables
...tallation.
Optionally, Tomcat may be configured for multiple instances by defining $CATALINA_BASE for each instance. If multiple instances are not configured, $CATALINA_BASE is the same as $CATALINA_HOME.
See: Apache Tomcat 7 - Introduction
Running with separate CATALINA_HOME and CATALINA_BAS...
What is string_view?
... array or string.
Such a view-handle class could be passed around cheaply by value and would offer cheap substringing operations (which can be implemented as simple pointer increments and size adjustments).
Many uses of strings don't require actual owning of the strings, and the string in question...
SecItemAdd and SecItemCopyMatching returns error code -34018 (errSecMissingEntitlement)
...tiple
possible causes:
Some instances of the problem are caused by incorrect
app signing. You can easily distinguish this case because the problem
is 100% reproducible.
Some instances of the problem are caused by a
bug in how iOS supports app development (r. 23,991,853). Debugg...
What's the best strategy for unit-testing database-driven applications?
I work with a lot of web applications that are driven by databases of varying complexity on the backend. Typically, there's an ORM layer separate from the business and presentation logic. This makes unit-testing the business logic fairly straightforward; things can be implemented in discrete modul...
Are there any Java method ordering conventions? [closed]
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+1. I prefer to sort by visibility. Shame Eclipse cannot do this automatically (it will always group all constructors together and all methods together.)
– finnw
Jan 12 '11 at 11:34
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Which method performs better: .Any() vs .Count() > 0?
...d to go through the GetEnumerator()/MoveNext()/Dispose() sequence required by Any() to check for a non-empty IEnumerable<T> sequence.
For just IEnumerable<T>, then Any() will generally be quicker, as it only has to look at one iteration. However, note that the LINQ-to-Objects implementa...
POST JSON fails with 415 Unsupported media type, Spring 3 mvc
...son',
'success': callback
});
};
The Content-Type header is used by @RequestBody to determine what format the data being sent from the client in the request is. The accept header is used by @ResponseBody to determine what format to sent the data back to the client in the response. That's w...
Remove duplicate rows in MySQL
...IKE your_table;
INSERT your_table_deduped
SELECT *
FROM your_table
GROUP BY index1_id,
index2_id;
RENAME TABLE your_table TO your_table_with_dupes;
RENAME TABLE your_table_deduped TO your_table;
#OPTIONAL
ALTER TABLE `your_table` ADD UNIQUE `unique_index` (`index1_id`, `index2_id`);
#...