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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...
Block Declaration Syntax List
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I personally like using this website (http://fuckingblocksyntax.com). The name is easier to remember than the block syntax itself:
http://fuckingblocksyntax.com
and if you can't load URLs with bad words in them you can use this mirror: http://goshdarnblocksynt...
Installing Ruby Gem in Windows
... I tried to install GEM on my PC by following the steps given in the site http://rubygems.org/pages/download .
7 Answers
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Can you use a trailing comma in a JSON object?
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No. The JSON spec, as maintained at http://json.org, does not allow trailing commas. From what I've seen, some parsers may silently allow them when reading a JSON string, while others will throw errors. For interoperability, you shouldn't include it.
The cod...
MySQL remove all whitespaces from the entire column
...racters :
UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
To remove first and last space(s) of column :
UPDATE `table` SET `col_name` = TRIM(`col_name`)
http://dev.mysql.com/doc/refman/5.0/en/string-fu...
Difference between Node object and Element object?
...ode.prototype
true
Here are some docs for the Node and Element classes:
https://developer.mozilla.org/en-US/docs/DOM/Node
https://developer.mozilla.org/en-US/docs/DOM/Element
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Elastic Search: how to see the indexed data
...rch is already running on your local machine), open a browser window to:
http://localhost:9200/_plugin/head/
Alternatively, you can just use curl from the command line, eg:
Check the mapping for an index:
curl -XGET 'http://127.0.0.1:9200/my_index/_mapping?pretty=1'
Get some sample docs:...
jQuery `.is(“:visible”)` not working in Chrome
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An ancestor element is hidden, so the element is not shown on the page.
http://api.jquery.com/visible-selector/
Here's a small jsfiddle example with one visible and one hidden element:
http://jsfiddle.net/tNjLb/
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Can an interface extend multiple interfaces in Java?
...hen single implementation works for both :).
Read my complete post here:
http://codeinventions.blogspot.com/2014/07/can-interface-extend-multiple.html
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String concatenation vs. string substitution in Python
...return "%s%s/%d" % (DOMAIN, QUESTIONS, n)
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>>> so_q_sub(1000)
'http://stackoverflow.com/questions/1000'
>>> def so_q_cat(n):
... return DOMAIN + QUESTIONS + '/' + str(n)
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>>> so_q_cat(1000)
'http://stackoverflow.com/questions/1000'
>>> t1 = timeit.Timer('so...