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Orika: Mapping JAXB Objects to Business/Domain Objects

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This post looks at mapping JAXB objects to business domain objects with Orika. Earlier this month, I covered the same mapping use case using reflection-based Dozer. In this post, I’ll assume the same example classes need to be mapped, but they will be mapped using Orika instead of Dozer. Dozer and Orika are intended to solve the same type of ...

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Advanced Java generics: retreiving generic type arguments

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After their introduction in the JDK5, Java generics quickly became an integral element of many Java programs. However, as easy Java generics seem at first glance, as quickly a programer can get lost with this feature. Most Java programers are aware of the Java compiler’s type erasure. Generally speaking, type erasure means that all generic type information about a Java ...

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Java 8 parameter name at runtime

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Java 8 will be introducing an easier way to discover the parameter names of methods and constructors. Prior to Java 8, the way to find the parameter names is by turning the debug symbols on at the compilation stage which adds meta information about the parameter names in the generated class files then to extract the information which is complicated ...

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Playing with futures

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During job interviews we often give Scala developers a simple design task: to model a binary tree. The simplest but not necessarily best implementation involves Option idiom:                 case class Tree[+T](value: T, left: Option[Tree[T]], right: Option[Tree[T]]) Bonus points for immutability, using case class and covariance. Much better but more complex implementation involves two ...

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MongoDB “Lightning Fast Aggregation” Challenged with Oracle

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What does “Scale” even mean in the context of databases? When talking about scaling, people have jumped to the vendor-induced conclusion that: SQL doesn’t scale NoSQL scales It is very obvious that NoSQL vendors make such claims. It has also been interesting that many NoSQL consumers made such claims, even if they probably confused SQL in general with MySQL in ...

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Project Student: Webservice Client with Jersey

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This is part of Project Student. Other posts are Webservice Client with Jersey, Business Layer and Persistence with Spring Data. The first layer of the RESTful webapp onion is the webservice client. It can be used to mimic web pages containing AJAX content or by programmatic users of the webapp. N.B., the latter might include other webapps, e.g., if you ...

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Give Credit Generously

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I had a boss who was great at saying, “Terri did this. Jen did that. JR did this other thing.” We all knew who had learned about different areas of the system, who had succeeded at which parts of testing or development or project management. It was great. She didn’t just tell us. Nope, our boss told her bosses. That’s ...

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Performance tuning – measure don’t guess

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In my performance tuning career I have given the advice to measure and not guess more often than I can recall. And in many cases the target of this advice has given up after looking at the monolithic 500,000 LOC legacy application they are working. In the post we are about to share some simple tools and concepts how to ...

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The infamous sun.misc.Unsafe explained

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The biggest competitor to the Java virtual machine might be Microsoft’s CLR that hosts languages such as C#. The CLR allows to write unsafe code as an entry gate for low level programming, something that is hard to achieve on the JVM. If you need such advanced functionality in Java, you might be forced to use the JNI which requires ...

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MongoDB Facts: Lightning speed aggregation

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In my previous post, I demonstrated how fast you can insert 50 millions time-event entries with MongoDB. This time we will make use of all that data to fuel our aggregation tests. This is how one time-event entry looks like:             { "_id" : ObjectId("529a2a988cccdb538932d31f"), "created_on" : ISODate("2012-05-02T06:08:47.835Z"), "value" : 0.9270193106494844 } Beside the default ...

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