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Avoid synchronized(this) in Java?
...out that synchronized(this) should be avoided. Instead, they claim, a lock on a private reference is to be preferred.
22 ...
Why does Javascript getYear() return 108?
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It's a Y2K thing, only the years since 1900 are counted.
There are potential compatibility issues now that getYear() has been deprecated in favour of getFullYear() - from quirksmode:
To make the matter even more complex, date.getYear...
Can an abstract class have a constructor?
... edited Dec 30 '16 at 1:19
rimsky
1,04322 gold badges1414 silver badges2424 bronze badges
answered Nov 4 '08 at 3:19
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How to remove all whitespace from a string?
... whitespace, use:
gsub("[[:space:]]", "", x) # note the double square brackets
## [1] "xy" "←→" "xy" NA
gsub("\\s", "", x) # same; note the double backslash
library(regex)
gsub(space(), "", x) # same
"[:space:]" is an R-specific regular expression group matching all space cha...
How to find the Windows version from the PowerShell command line
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Peter Mortensen
26.5k2121 gold badges9292 silver badges122122 bronze badges
answered Sep 7 '11 at 7:37
Jeff MercadoJeff M...
Git says “Warning: Permanently added to the list of known hosts”
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Solution: create a ~/.ssh/config file and insert the line:
UserKnownHostsFile ~/.ssh/known_hosts
You will then see the message the next time you access Github, but after that you'll not see it anymore because the host is added to the known_hosts file. This fixes the issue, rather than...
setMaxResults for Spring-Data-JPA annotation?
...7.0 (Evans release train).
You can use the newly introduced Top and First keywords that allow you to define query methods like this:
findTop10ByLastnameOrderByFirstnameAsc(String lastname);
Spring Data will automatically limit the results to the number you defined (defaulting to 1 if omitted). N...
How do I send a cross-domain POST request via JavaScript?
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Update: Before continuing everyone should read and understand the html5rocks tutorial on CORS. It is easy to understand and very clear.
If you control the server being POSTed, simply leverage the "Cross-Origin Resource Sharing standard" by setting response headers on the server. This answer is di...
How can I get jQuery to perform a synchronous, rather than asynchronous, Ajax request?
...ous option to be false to get a synchronous Ajax request. Then your callback can set some data before your mother function proceeds.
Here's what your code would look like if changed as suggested:
beforecreate: function (node, targetNode, type, to) {
jQuery.ajax({
url: 'http://example.c...
How do I disable form fields using CSS?
Is it possible to disable form fields using CSS? I of course know about the attribute disabled, but is it possible to specify this in a CSS rule? Something like -
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