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Compile-time checking JPA queries

JPA provides several alternatives for querying data. Such alternatives may be classified attending to a variety of criteria, eg, language used (SQL vs JPQL) or whether queries are static ...
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Android Listview with multiple row layout

In many posts we talked extensively about ListView and how to handle it: creating custom adapter or handling user interactions. In this post, I will cover another aspect related to ...
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Spring MVC Integration Testing: Assert the given model attribute(s) have global errors

In order to report a global error in Spring MVC using Bean Validation we can create a custom class level constraint annotation. Global errors are not associated with any specific fields ...
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Oracle’s Latest Java 8 Update Broke Your Tools — How Did it Happen?

If you’ve been keeping up with the news in the Java world lately, you’ve probably heard that the latest Java 8 build released by Oracle, Java 8u11 (and Java 7u65), introduced errors ...
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Difference between getPath(), getCanonicalPath() and getAbsolutePath() of File in Java

The File API is very important one in Java, since it gives access of File system to Java programs. Though Java’s file API is rich, there are lot of subtleties to know when you ...
java-interview-questions-answers

ADF: Popup, Dialog and Input Components

In this post I would like to focus on a very common use case when we have af:popup containing af:dialog with input components inside. There are a couple of pitfalls that we need to ...
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Strategies to migrate from an DAO library

In this post I will discuss several strategies to handle the following situation: You’re working on a legacy project that uses a company library with DBOs and DAOs for accessing ...
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But I’m negotiable

I review many emailed job applications each week that include a salary expectation, usually in the form of “seeking $X,000 per year“. Some continue with a phrase that has ...
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SQL Tip of the Day: Be Wary of SELECT COUNT(*)

Recently, I’ve encountered this sort of query all over the place at a customer site:                     DECLARE v_var NUMBER(10); BEGIN ...
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Java’s Volatile Modifier

A while ago I wrote a Java servlet Filter that loads configuration in its init function (based on a parameter from web.xml). The filter’s configuration is cached in a private field. ...
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