JAVA ANDROID PROJECT LINKS

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How whatsapp works

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How WhatsApp works and how to build a WhatsApp clone? WhatsApp is the most sought after messaging application that has revolutionized the messaging app market and has inspired a bunch of clones and competitors as well. On the flipside, many among those cloning attempts are unable to match the standards of WhatsApp. WhatsApp clones which promise to have similar functionalities as that of the market giant are either a mere email messaging systems showcased as a messaging system or doesn’t use/follow even half of the technical aspects of WhatsApp. In order to come up with a WhatsApp like chat application, one should have a detailed understanding of its functioning mechanism and technicalities. Server side technicalities deployed in WhatsApp WhatsApp is a real-time messaging application, which makes use of Ejabberd (XMPP) server . This server facilitates instant message transfer between two or many users at
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ABOUT WHATSAPP

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WhatsApp Messenger is a proprietary cross-platform instant messaging client for smartphones . It uses the Internet to send text messages, images, video, user location and audio media messages [ 8 ] [ 9 ] to other users using standard cellular mobile numbers . As of February 2016, WhatsApp had a user base of up to one billion, [ 10 ] making it the most globally popular messaging application . [ 11 ] WhatsApp Inc. , based in Mountain View , California, was acquired by Facebook Inc. on February 19, 2014, for approximately US$ 19.3 billion. [ 12 ] [ 13 ] Contents 1 History 1.1 Acquisition by Facebook 2 Platform support 3 WhatsApp Web 4 Technical 5 Security 6 Privacy 7 Criticism of business model 8 Competition and shares 9 See also 10 References 11 External links History WhatsApp Inc., was founded in 2009 by Brian Acton and Jan Koum , both former employees of Yahoo! . After Koum and Acton left Yahoo! in September 2007, the duo travelled
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Edit Java Class file at runtime

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How it works   # Hot deployment based on Java HotSwap   # With some IDEs you can perform changes on your java classes, compile them and test the results without redeploying the project or restarting your server. This approach is based in JVM   HotSwap . HotSwap allows debuggers to update class bytecode, using the same class identity. This meant that all objects could refer to an updated class and execute new code when their methods were called, preventing the need to reload a container whenever class bytecode was changed Unfortunately, this redefinition is   limited only to changing method bodies   -- it cannot either add methods or fields or otherwise change anything else, except for the method bodies. Neither can you "hot deploy" JSPs and some other resources. Solution 1   Hot deployment beyond HotSwap with JRebel   # To support the "hot deployment" of deeper changes in Java classes, you can use   JRebel technology . JRebel installs a -java
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