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1. JPA Mini Book

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The Inconvenient Truth About Dynamic vs. Static Typing

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Sometimes there are these moments of truth. They happen completely unexpectedly, such as when I read this tweet: Good discussion of Facebook Flow – http://t.co/5KTKakDB0w — David J. Pearce (@whileydave) November 23, 2014 David is the author of the lesser-known but not at all lesser-interesting Whiley programming language, a language that has a lot of static type checking built in ...

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Good Enough

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We hear a lot about building products which are “good enough” or “just barely good enough.” How do we know what “good enough” means for our customers?  No one really tells us. Different Perspectives of Good Enough There are several important ways to think about a product being good enough – for this article, we will limit the context for discussion to ...

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5 ways to initialize lazy relations and when to use them

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Lazy loading of relations between entities is a well established best practice in JPA. Its main goal is to retrieve only the requested entities from the database and load the related entities only if needed. That is a great approach, if we only need the requested entities. But it creates additional work and can be the cause of performance problems, ...

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One Jar To Rule Them All: Arquillian + Java 8

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With Java 8, a lot of new language improvements have been implemented for making life of developer easier. In my opinion, one of the greatest things it has Java 8 is that in some situations developed code looks more beautiful that using prior approaches, and I am referring in Lambdas and Method references. This post is not about learning these ...

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Gradle Goodness: Continue Build Even with Failed Tasks

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If we run a Gradle build and one of the tasks fails, the whole build stops immediately. So we have fast feedback of our build status. If we don’t want to this and want Gradle to execute all tasks, even though some might have failed, we use the command line option --continue. When we use the --continue command line option ...

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On heap vs off heap memory usage

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Overview I was recently asked about the benefits and wisdom of using off heap memory in Java. The answers may be of interest to others facing the same choices. Off heap memory is nothing special. The thread stacks, application code, NIO buffers are all off heap.  In fact in C and C++, you only have unmanaged memory as it does not have ...

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JGit Authentication Explained

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Authentication in JGit is mostly on par with native Git. Commonly used protocols like SSH and HTTP(S) and their authentication methods are supported. This article summarizes how to use the JGit authentication API to securely access remote Git repositories. Though the examples in this article use the CloneCommand, the described techniques can be applied to all classes that connect to ...

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When Should You Move from Iterations to Flow?

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I’m writing part of the program management book, talking about how you need to keep everything small to maintain momentum. Sometimes, to keep your work small, teams move from iterations to flow. Here are times when you might consider moving from iteration to flow:             The Product Owner wants to change the order of features ...

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