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Dealing with “java.lang.OutOfMemoryError: PermGen space” error

... The solution was to add these flags to JVM command line when Tomcat is started: -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled You can do that by shutting down the tomcat service, then going into the Tomcat/bin directory and running tomcat6w.exe. Under th...
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Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4

...s no such thing as "unsigned integer overflow") means undefined behaviour. And this means anything can happen, and discussing why does it happen under the rules of C++ doesn't make sense. C++11 draft N3337: §5.4:1 If during the evaluation of an expression, the result is not mathematically de...
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What is AppDomain? [duplicate]

... @AgentFire: If some code running in some thread and some AppDomain calls code from another AppDomain, then the thread "crosses" the AppDomain border and runs code from that other AppDomain. So threads do not belong to specific AppDomains...although one can say that a threa...
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Converting Dictionary to List? [duplicate]

... Your problem is that you have key and value in quotes making them strings, i.e. you're setting aKey to contain the string "key" and not the value of the variable key. Also, you're not clearing out the temp list, so you're adding to it each time, instead of j...
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How to list the size of each file and directory and sort by descending size in Bash?

... Simply navigate to directory and run following command: du -a --max-depth=1 | sort -n OR add -h for human readable sizes and -r to print bigger directories/files first. du -a -h --max-depth=1 | sort -hr ...
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Getting error while sending email through Gmail SMTP - “Please log in via your web browser and then

... I know this is an older issue, but I recently had the same problem and was having issues resolving it, despite attempting the DisplayUnlockCaptcha fix. This is how I got it alive. Head over to Account Security Settings (https://www.google.com/settings/security/lesssecureapps) and enable "Ac...
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html5 - canvas element - Multiple layers

...ver, you could layer multiple <canvas> elements on top of each other and accomplish something similar. <div style="position: relative;"> <canvas id="layer1" width="100" height="100" style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas> <canvas id="layer...
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Convert List to List

... The way to make this work is to iterate over the list and cast the elements. This can be done using ConvertAll: List<A> listOfA = new List<C>().ConvertAll(x => (A)x); You could also use Linq: List<A> listOfA = new List<C>().Cast<A>().ToList()...
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What is a difference between

What is the difference between <? super E> and <? extends E> ? 9 Answers ...
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Understanding the main method of python [duplicate]

...ed" % __file__) Using this convention one can have a file define classes and functions for use in other programs, and also include code to evaluate only when the file is called as a standalone script. It's important to understand that all of the code above the if __name__ line is being executed, ...