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How do servlets work? Instantiation, sessions, shared variables and multithreading

...tainer (like Apache Tomcat) starts up, it will deploy and load all its web applications. When a web application is loaded, the servlet container creates the ServletContext once and keeps it in the server's memory. The web app's web.xml and all of included web-fragment.xml files is parsed, and each &...
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How to run eclipse in clean mode? what happens if we do so?

... [-t] [-f] [-W] [-R] [-n] [-g] [-h] [-b <bundle identifier>] [-a <application>] [filenames] [--args arguments] Help: Open opens files from a shell. By default, opens each file using the default application for that file. If the file is in the form of a URL, the file will be...
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Android: Go back to previous activity

I want to do something simple on android app. How is it possible to go back to a previous activity. 23 Answers ...
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Spring Boot Remove Whitelabel Error Page

...remove white label error page, so what I've done was created a controller mapping for "/error", 15 Answers ...
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Can local storage ever be considered secure? [closed]

I'm required to develop a web application that will function offline for long periods. In order for this to be viable I cannot avoid saving sensitive data (personal data but not the kind of data you would only store hashed) in local storage. ...
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Garbage collector in Android

...should go over the GC's head and run Bitmap.recycle() or System.gc() where appropriate. But only pre-honeycomb. – Timmmm Nov 29 '12 at 18:10 1 ...
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When to call activity context OR application context?

... getApplicationContext() is almost always wrong. Ms. Hackborn (among others) have been very explicit that you only use getApplicationContext() when you know why you are using getApplicationContext() and only when you need to use ...
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PHP Constants Containing Arrays?

...: # define constant, serialize array define ("FRUITS", serialize (array ("apple", "cherry", "banana"))); # use it $my_fruits = unserialize (FRUITS); share | improve this answer | ...
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How to create PDFs in an Android app? [closed]

Is there any way to create PDF Files from an Android application? 8 Answers 8 ...
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java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

I'm using the support library for my app. In my FragmentActivity I'm using an AsyncTask for downloading data from internet. In the onPreExecute() method I add a Fragment and in the onPostExecute() method I remove it again. When the orientation is changed in between, I get the above mentioned excepti...