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What does JVM flag CMSClassUnloadingEnabled actually do?
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Update This answer is relevant for Java 5-7, Java 8 has this fixed: https://blogs.oracle.com/poonam/about-g1-garbage-collector,-permanent-generation-and-metaspace Kudos go to mt.uulu
For Java 5-7:
The standard Oracle/Sun VM look on the world is: Classes are forever. So once loaded, they sta...
Push Notifications in Android Platform
... near real time push notification? )
I recently started playing with MQTT http://mqtt.org for Android as a way of doing this sort of thing (i.e. push notification that is not SMS but data driven, almost immediate message delivery, not polling, etc.)
I have a blog post with background information o...
Get elements by attribute when querySelectorAll is not available without using libraries?
...ents by attribute. It's now supported in all relevant browsers (even IE8): http://caniuse.com/#search=queryselector
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Map over object preserving keys
...the required function in lodash, a utility library similar to underscore.
http://lodash.com/docs#mapValues
_.mapValues(object, [callback=identity], [thisArg])
Creates an object with the same keys as object and values generated by
running each own enumerable property of object through the...
What's “this” in JavaScript onclick?
...onclick attribute belongs:
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js">
</script>
<script type="text/javascript">
function func(e) {
$(e).text('there');
}
</script>
<a onclick="func(this)">here</a>...
Global and local variables in R
...ou can have a look at these two links for understanding how to use them:
http://stat.ethz.ch/R-manual/R-devel/library/base/html/environment.html
http://stat.ethz.ch/R-manual/R-devel/library/base/html/get.html
Here you have a small example:
test.env <- new.env()
assign('var', 100, envir=test...
Can I target all tags with a single selector?
...
It's not basic css, but if you're using LESS (http://lesscss.org), you can do this using recursion:
.hClass (@index) when (@index > 0) {
h@{index} {
font: 32px/42px trajan-pro-1,trajan-pro-2;
}
.hClass(@index - 1);
}
.hClass(6);
Sass (http://sas...
Connecting to Azure website via FTP
...eofyoursite"
userPWD="sOmeCrYPTicL00kIngStr1nG"
destinationAppUrl="http://nameofyoursite.azurewebsites.net"
SQLServerDBConnectionString=""
mySQLDBConnectionString=""
hostingProviderForumLink=""
controlPanelLink="http://windows.azure.com">
<databases/>
</publ...
How do I check if an HTML element is empty using jQuery?
...
if ($('#element').is(':empty')){
//do something
}
for more info see http://api.jquery.com/is/ and http://api.jquery.com/empty-selector/
EDIT:
As some have pointed, the browser interpretation of an empty element can vary. If you would like to ignore invisible elements such as spaces and line...
Choosing Java vs Python on Google App Engine
...
Watch this app for changes in Python and Java performance:
http://gaejava.appspot.com/
(edit: apologies, link is broken now. But following para still applied when I saw it running last)
Currently, Python and using the low-level API in Java are faster than JDO on Java, for this simpl...