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Hazelcast’s MapLoader pitfalls


One of the core data structures provided by Hazelcast is IMap<K, V> extendingjava.util.concurrent.ConcurrentMap – which is basically a distributed map, often used as cache. You can configure such map to use custom MapLoader<K, V> – piece of Java code that will be asked every time you try to .get()something from that map (by key) which is not yet there. This ...

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Log your miles and community runs: Java EE 7 Real World Experience

java-interview-questions-answers is an easy way to track your running activities and share with friends and families. Day-based or distance-based goals can be created and then tracked. It also allows to create community run goals and have multiple runners participate and track their activities towards that goal. You can also find out local runners and connect with them. The project was started to help track running activities for #JavaOneStreak. The ...

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Asynchronous SQL Execution with jOOQ and Java 8’s CompletableFuture


Reactive programming is the new buzzword, which essentially just means asynchronous programming or messaging. Fact is that functional syntax greatly helps with structuring asynchronous execution chains, and today, we’ll see how we can do this in Java 8 using jOOQ and the new CompletableFuture API. In fact, things are quite simple:       // Initiate an asynchronous call chain ...

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How to run junit tests inside the android project


Hi there! Today i’m gonna show you how to create and run junit tests inside your android project without creating a separated test project. With those tests we will rapidly be able to automate and test the app’s logic and some simple UI behaviors. The example below is very straightforward and much more intuitive than other approaches i saw out ...

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For All You Know, It’s Just a Java Library


Blast from the past… I wrote this in May, 2008… and I’ve gotta say, I was pretty spot-on including Java 8 adopting some of Scala’s better features: It’s starting to happen… the FUD around Scala. The dangers of Scala. The “operational risks” of using Scala. It started back in November when I started doing lift and Scala projects for hire. ...

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ChoiceFormat: Numeric Range Formatting


The Javadoc for the ChoiceFormat class states that ChoiceFormat “allows you to attach a format to a range of numbers” and is “generally used in a MessageFormat for handling plurals.” This post describes java.text.ChoiceFormat and provides some examples of applying it in Java code. One of the most noticeable differences between ChoiceFormat and other “format” classes in the java.text package ...

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3 Essential Ways To Start Your JBoss BPM Process


This episode of tips and tricks will help you to understand the best way to initiate your process instances for your needs. Planning your projects might include process projects, but have you thought about the various ways that you can initiate your process? Maybe you have JBoss BPM Suite running locally in your architecture, maybe you have it running in ...

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Preventing lost updates in long conversations


Introduction All database statements are executed within the context of a physical transaction, even when we don’t explicitly declare transaction boundaries (BEGIN/COMMIT/ROLLBACK). Data integrity is enforced by the ACID properties of database transactions. Logical vs Physical transactions An logical transaction is an application-level unit of work that may span over multiple physical (database) transactions. Holding the database connection open throughout ...

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