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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...IP address in JDBC URL instead.
Verify it based on my.cnf of MySQL DB.
Start the DB.
Verify if mysqld is started without the --skip-networking option.
Restart the DB and fix your code accordingly that it closes connections in finally.
Disable firewall and/or configure firewall/proxy to all...
How is Node.js inherently faster when it still relies on Threads internally?
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There are actually a few different things being conflated here. But it starts with the meme that threads are just really hard. So if they're hard, you are more likely, when using threads to 1) break due to bugs and 2) not use them as efficiently as possible. (2) is the one you're asking about....
How can I find the length of a number?
...= 1000000;
let maxSize = 10000;
// ------ Weisstein length.
console.log("Starting weissteinLength length.");
let startTime = Date.now();
for (let index = 0; index < iterations; index++) {
weissteinLength(Math.random() * maxSize);
}
console.log("Ended weissteinLength length. Took : " + (Da...
Windows Explorer “Command Prompt Here” [closed]
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Just type "cmd" to location bar, that's it. It will start a new command prompt in current path.
This solution was confirmed to work in Windows XP, Vista, 7, 8 and 10 (including Creators Update).
Keystrokes to move the focus to the location bar:
AltD in English (pointed out...
Convert hex to binary
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Doesn't provide leading zeros if hex string starts with 00.
– Dragon
Dec 20 '17 at 22:19
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Why use Ruby instead of Smalltalk? [closed]
...circles. In the meantime Java EE has had a complete acceptance lifecycle starting with raving fanboys promoting it and finally getting bored and moving onto Ruby ;-}Ironically, Seaside is starting to get a bit of mindshare among the cognoscenti so we may find that Smalltalk rides that cycle back i...
JavaScriptSerializer - JSON serialization of enum as string
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The third line from this example was added to the App_start/webapiconfig.cs file and did a trick for me in an ASP.NET Web API 2.1 project to return strings for enum values in REST (json fomat) calls.
– Greg Z.
Mar 21 '14 at 17:27
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How does the MapReduce sort algorithm work?
...es and hash partitioning, though projects such as PigLatin and Sawzall are starting to address these problems.
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jQuery Popup Bubble/Tooltip [closed]
...ouseover event as well. I've done it and it doesn't take 200 lines at all. Start with triggering the event, then use a function that will create the tooltip.
$('span.clickme').mouseover(function(event) {
createTooltip(event);
}).mouseout(function(){
// create a hidefunction o...
oh-my-zsh slow, but only for certain Git repo
I recently started using Zsh and it's awesome. Unfortunately, for the project I consider my "main" project, everything is slow. What I mean is that every time I run a command - ls , for example - there's about a five-second delay between the time the command is executed and the time I can use the t...