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Spring MVC: How to perform validation?
I would like to know what is the cleanest and best way to perform form validation of user inputs. I have seen some developers implement org.springframework.validation.Validator . A question about that: I saw it validates a class. Does the class have to be filled manually with the values from the us...
Git Remote: Error: fatal: protocol error: bad line length character: Unab
I set up a git server and want now to push initially my repo from the client.
I used git push origin master and get this error message:
...
Should I store generated code in source control
...u expect to backport a bug to an older version of your product unless you know what version of the compiler and linker you were using back then? A code generator is no different from your C++/Java/C# compiler. The fact that you might be able to read its output is immaterial: its input is the source....
What is the difference between self::$bar and static::$bar in PHP?
...d PHP for the self variable, which in turn asks for Foos variable instead.
Now if we swap the call with static, we will instead get Bars overridden value:
With static call:
class Foo
{
protected static $var = 123;
public function getVar()
{
return static::$var;
}
}
clas...
What order are the Junit @Before/@After called?
...
This is now documented behavior. "methods of superclasses will be run before those of the current class, unless they are overridden in the current class. No other ordering is defined" This allows having @Before mixin interfaces, but...
Find running median from a stream of integers
... of minHeap)/2
Else
median = root of the heap with more elements
Now I will talk about the problem in general as promised in the beginning of the answer. Finding running median from a stream of data is a tough problem, and finding an exact solution with memory constraints efficiently is pr...
SSH to Elastic Beanstalk instance
...
Elastic beanstalk CLI v3 now supports direct SSH with the command eb ssh. E.g.
eb ssh your-environment-name
No need for all the hassle of setting up security groups of finding out the EC2 instance address.
There's also this cool trick:
eb ssh -...
HTTP 1.0 vs 1.1
...d encoding, which allows a response to be sent before its
total length is known.
Faster response and great bandwidth savings, by adding cache
support.
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How do I find the duplicates in a list and create another list with them?
...q):
seen = set()
seen_add = seen.add
# adds all elements it doesn't know yet to seen and all other to seen_twice
seen_twice = set( x for x in seq if x in seen or seen_add(x) )
# turn the set into a list (as requested)
return list( seen_twice )
a = [1,2,3,2,1,5,6,5,5,5]
list_duplicates(a...
How do I 'overwrite', rather than 'merge', a branch on another branch in Git?
...eckout B
$ echo 'B' > file2
$ git commit -m 'change on branch B' file2
Now, let's try the strategy option (doesn't really matter if we use theirs or ours for this explanation):
$ git merge -X ours A
$ cat file*
A
B
original
We end up with a merge of both branches' contents (branch "strategy-opt...