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ADF: Popup, Dialog and Input Components

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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 watch out for when implementing this use case. Let’s consider a simple example:             <af:popup id="p1" contentDelivery="lazyUncached">             <af:dialog id="d2" ...

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Strategies to migrate from an DAO library

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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 the database. But the generator for this library is broken and you have to make changes to the DBOs and/or DAOs. Basic cases You will face the following three basic cases, when the database changes: ...

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But I’m negotiable

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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 become trite, not to mention quite costly to job seekers everywhere. “but I’m negotiable” What these candidates are telling us is “I have a target number, but I want you to know in advance that I’m willing to accept less.“ This phrase is ...

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SQL Tip of the Day: Be Wary of SELECT COUNT(*)

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Recently, I’ve encountered this sort of query all over the place at a customer site:                     DECLARE v_var NUMBER(10); BEGIN SELECT COUNT(*) INTO v_var FROM table1 JOIN table2 ON table1.t1_id = table2.t1_id JOIN table3 ON table2.t2_id = table3.t2_id ... WHERE some_predicate; IF (v_var = 1) THEN do_something ELSE do_something_else END IF; ...

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Java’s Volatile Modifier

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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. I set the volatile modifier on the field. When I later checked the company Sonar to see if it found any warnings or issues in the code I was ...

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Are You Using SQL PIVOT Yet? You Should!

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Every once in a while, we run into these rare SQL issues where we’d like to do something that seems out of the ordinary. One of these things is pivoting rows to columns. A recent question on Stack Overflow by Valiante asked for precisely this. Going from this table:             +------+------------+----------------+-------------------+ | dnId | propNameId ...

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Default Methods: Java 8’s Unsung Heros

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A few weeks ago I wrote a blog saying that developers learn new languages because they’re cool. I still stand by this assertion because the thing about Java 8 is it’s really cool. Whilst the undoubted star of the show is the addition of Lambdas and the promotion of functions to first class variables, my current favourite is default methods. ...

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Validation in java (javafx)

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Validation is one thing that’s missing from the core javafx framework. To fill in this gap there is already a 3rd party validation library that’s present in controlsfx. However there’s one issue I have with it: it wasn’t created with FXML in mind. That’s not to say it isn’t a good library, it just misses this detail and for me ...

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INTEL Perceptual Computing – RealSense Challenge 2014

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            Perceptual Computing technology is redefining the boundaries between human and computer interaction. Intel invites you to claim your share of history by designing new, leading edge perceptual computing Apps. RealSense Challenge 2014 is a new contest in which developers are challenged to design perceptual computing apps. At the heart of this competition, the new ...

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What DSLs are not for

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Domain specific languages are special programming languages. Each fits some special “domain” and makes the business code simpler. Using a DSL the business level problem can be implemented higher level and therefore the resulting code is simpler, it is created faster, presumably contains less errors. Some DSLs in some areas make it even possible to develop business functionality by the ...

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