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IllegalArgumentException or NullPointerException for a null parameter? [closed]

I have a simple setter method for a property and null is not appropriate for this particular property. I have always been torn in this situation: should I throw an IllegalArgumentException , or a NullPointerException ? From the javadocs, both seem appropriate. Is there some kind of an understood...
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Hibernate Error: org.hibernate.NonUniqueObjectException: a different object with the same identifier

I have two user Objects and while I try to save the object using 36 Answers 36 ...
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Node.js Unit Testing [closed]

... I ended up using node-unit and am really happy with it. I was using Expresso originally but the fact that it runs tests in parallel caused a few problems. (For example using database fixtures doesn't work well in this situation). ...
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How to prevent sticky hover effects for buttons on touch devices

I have created a carousel with a previous and a next button that are always visible. These buttons have a hover state, they turn blue. On touch devices, like iPad, the hover state is sticky, so the button stays blue after tapping it. I don't want that. ...
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Why so red? IntelliJ seems to think every declaration/method cannot be found/resolved

I just installed and re-installed IntelliJ. Every Java file is coming up RED. I checked the JDK; it is at 1.6.##. The maven clean install build worked just fine. ...
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How to change the ROOT application?

...r Tomcat webapps folder (rm -fr *). Then rename your WAR file to ROOT.war, and finally start your Tomcat from the bin directory (sh startup.sh). Leave your war file in $CATALINA_BASE/webapps under its original name. Turn off autoDeploy and deployOnStartup in your Host element in the server.xml file...
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Invoking JavaScript code in an iframe from the parent page

Basically, I have an iframe embedded in a page and the iframe has some JavaScript routines I need to invoke from the parent page. ...
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What's the difference between Spring Data's MongoTemplate and MongoRepository?

...write an application with which I can do complex queries using spring-data and mongodb. I have been starting by using the MongoRepository but struggled with complex queries to find examples or to actually understand the Syntax. ...
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Is it better to use C void arguments “void foo(void)” or not “void foo()”? [duplicate]

What is better: void foo() or void foo(void) ? With void it looks ugly and inconsistent, but I've been told that it is good. Is this true? ...
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Why is this inline-block element pushed downward?

Following is my code and I want to understand that why #firstDiv is being pushed downward by all browsers. I really want to understand the inner workings of the fact that why its being pushed downward rather than pulling it upward by one way or another. (and I know how to align their tops :)) ...