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How to respond with HTTP 400 error in a Spring MVC @ResponseBody method returning String?
...lt;>(json,HttpStatus.OK);
UPDATE 1
after spring 4.1 there are helper methods in ResponseEntity could be used as
return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(null);
and
return ResponseEntity.ok(json);
...
What's the difference between session.Merge and session.SaveOrUpdate?
I notice sometimes with my parent/child objects or many-to-many relationships, I need to call either SaveOrUpdate or Merge . Usually, when I need to call SaveOrUpdate , the exception I get on calling Merge has to do with transient objects not being saved first.
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Having both a Created and Last Updated timestamp columns in MySQL 4.0
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From the MySQL 5.5 documentation:
One TIMESTAMP column in a table can have the current timestamp as the default value for initializing the column, as the auto-update value, or both. It is not possible to have the current timestamp be the defaul...
Rails: Logging the entire stack trace of an exception
I have been trying to figure out the right way to log a stack trace. I came across this link which states that logger.error $!, $!.backtrace is the way to go but that does not work for me log_error does. As per documentation I do not see how passing a second argument to the error method would ...
Matplotlib 2 Subplots, 1 Colorbar
...spent entirely too long researching how to get two subplots to share the same y-axis with a single colorbar shared between the two in Matplotlib.
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Convert PHP closing tag into comment
...ng. Under normal operation this does not cause a problem, but I need to comment out the line.
6 Answers
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How can one use multi threading in PHP applications
Is there a realistic way of implementing a multi-threaded model in PHP whether truly, or just simulating it. Some time back it was suggested that you could force the operating system to load another instance of the PHP executable and handle other simultaneous processes.
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In C#, how to check if a TCP port is available?
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Since you're using a TcpClient, that means you're checking open TCP ports. There are lots of good objects available in the System.Net.NetworkInformation namespace.
Use the IPGlobalProperties object to get to an array of TcpConnectionInformation objects, which y...
How do I calculate percentiles with python/numpy?
...there a convenient way to calculate percentiles for a sequence or single-dimensional numpy array?
11 Answers
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Static member initialization in a class template
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Just define it in the header:
template <typename T>
struct S
{
static double something_relevant;
};
template <typename T>
double S<T>::something_relevant = 1.5;
Since it is part of a template, as with all templates the compiler will make sure it's o...