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Dealing with “java.lang.OutOfMemoryError: PermGen space” error
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@TimHowland, it can be a permanent fix if the root cause is not classloader leakage, just too many classes/static data in your web app.
– Péter Török
Dec 14 '11 at 8:50
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Redirecting to a relative URL in JavaScript
... I found using window.location.href = '../' redirected to the root of the site and not "one level up" as expected. When the current page is "www.example.com/customers/list" I needed to use './'. I guess this is because "list" is not considered as a directory level.
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How to find a deleted file in the project commit history?
...ension, for that matter):
Prelim.: Avoid confusion by stepping to the git root
A nontrivial project may have multiple directories with similar or identical names.
> cd <project-root>
Find the full path
git log --diff-filter=D --summary | grep delete | grep MyFile
delete mode 100...
What is Virtual DOM?
...des in the Virtual DOM.
ReactElements can be rendered into HTML DOM
var root = React.createElement('div');
ReactDOM.render(root, document.getElementById('example'));
JSX compiles HTML tags into ReactElements
var root = <div/>;
ReactDOM.render(root, document.getElementById('example'));
R...
How to check the version before installing a package using apt-get?
...stall -s redis-server
NOTE: This is only a simulation!
apt-get needs root privileges for real execution.
Keep also in mind that locking is deactivated,
so don't depend on the relevance to the real current situation!
Reading package lists... Done
Building dependency tree
Read...
CMake not able to find OpenSSL library
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fixed it on macOS using
brew install openssl
cmake -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl -DOPENSSL_LIBRARIES=/usr/local/opt/openssl/lib
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Autoincrement VersionCode with gradle extra properties
...')) {
output.outputFile = new File(getProject().getRootDir(), "${fileNaming}-${versionMajor}.${versionMinor}.${versionPatch}-${outputFile.name}")
}
}
}
}
} else {
throw new GradleException("Could not read ve...
What's the difference between an inverted index and a plain old index?
... of procedures which have been done in order to speed up application (e.g. MySQL or other RDBMS Consult MySQL the docs). Indexing can also be related to caching etc.
Inverted index creates file with structure that is primarily intender for (fulltext) searching.
Inverted index consists of two main...
How to make rounded percentages add up to 100%
...ore important than an error at 99%. In the code below I've used the square root.
The complete algorithm is as follows:
Sum the percentages after rounding them all down, and subtract from 100. This tells you how many of those percentages must be rounded up instead.
Generate two error scores for ea...
Can't start Eclipse - Java was started but returned exit code=13
...rsion of Java (6 vs. 7 vs. 8) or whether you use JRE vs. JDK - it's always rooted in a bit-ness mismatch. See the accepted answer above.
– E-Riz
Apr 5 '16 at 16:21
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