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Bad class file magic or version

...K section, when you add an Android SDK you should provide the Java SDK and all my Android SDKs uses Java 8 as SDK so it create the class files with the wrong version even if the Project level is 1.7 (i don't know why, i supposed that everything was choosed by Project level). Now i changed the SDK (...
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What characters are allowed in DOM IDs? [duplicate]

... Actually there is a difference between HTML and XHTML. As XHTML is XML the rules for XML IDs apply: Values of type ID MUST match the Name production. NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | ...
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What are “connecting characters” in Java identifiers?

... I'm not sure that actually fully answers the (implied) question of which characters may start a Java identifier. Following links we end up at Character.isJavaIdentifierStart() which states A character may start a Java identifier if and only if one...
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What does the NS prefix mean?

... Yes, of course. It's all beautifully laid out in the other answers, that's why I didn't bother copying that information into mine. Sorry if that offends someone - I don't mind if the accepted answer changes to one of the others (if that's possibl...
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Read environment variables in Node.js

...bles per project: Create a .env file under the project directory and put all of your variables there. Add this line in the top of your application entry file: require('dotenv').config(); Done. Now you can access your environment variables with process.env.ENV_NAME. ...
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Android - Camera preview is sideways

... as a bug with certain hardware see here but can be overcome by using the call to mCamera.setDisplayOrientation(degrees) available in API 8. So this is how I implement it: public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { if (isPreviewRunning) { ...
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How do I convert a pandas Series or index to a Numpy array? [duplicate]

...ch time. [...] These two functions aim to improve the consistency of the API, which is a major step in the right direction. Lastly, .values will not be deprecated in the current version, but I expect this may happen at some point in the future, so I would urge users to migrate towards the newer A...
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How do I URL encode a string

...om/message/15674#15674 http://simonwoodside.com/weblog/2009/4/22/how_to_really_url_encode/ share | improve this answer | follow | ...
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Serializing object that contains cyclic object value

...e will come here for is debugging their circular objects and there's not really a great way to do that without pulling in a bunch of code, here goes. One feature that's not as well-known as JSON.stringify() is console.table(). Simply call console.table(whatever);, and it will log the variable in the...
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Perform commands over ssh with Python

...to automate some command line commands in Python. At the moment I'm doing calls thus: 13 Answers ...