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1. JPA Mini Book

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Java EE 8 : What does the community want?

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Following the earlier two community surveys, the first announced in December 2013 and the second in January 2014, Oracle calls the enterprise community for a third and final survey on Java EE 8.  The closing date for the survey will be March 24, 2014 at 12 AM Pacific Time. It is worth noting that while the first two surveys revealed the ...

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What’s the opposite of duplication?

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“If you see the same code structure in more than one place,” writes Martin Fowler in his wonderful, Refactoring book, “You can be sure that your program will be better if you can find a way to unify them.” He then describes how skillful programmers use the twin scalpels of extraction and substitution to excise duplicated expression and metastasized algorithm. ...

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Go for Java Programmers: Introduction

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Background Go (often referred to as “Golang”) is a fairly new programming language, first conceived in 2007, with version 1.0 launched in 2012.  Its three inventors are currently Google employees, with impressive credentials.  Ken Thompson is the legendary father of UNIX.  Rob Pike created the influential Plan 9 operating system alongside Thompson, and Robert Griesemer worked on the Java HotSpot ...

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Can MapReduce solve planning problems?

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To solve a planning or optimization problem, some solvers tend to scale out poorly: As the problem has more variables and more constraints, they use a lot more RAM memory and CPU power. They can hit hardware memory limits at a few thousand variables and few million constraint matches. One way their users typically work around such hardware limits, is ...

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WAR files vs. Java apps with embedded servers

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Most server-side Java applications (e.g. web or service-oriented) are intended to run within a container.  The traditional way to package these apps for distribution is to bundle them as a WAR file.  This is nothing more than a ZIP archive with a standard directory layout, containing all of libraries and application-level dependencies needed at runtime.  This format is mostly interoperable, ...

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Integration testing with Maven and Docker

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Docker is one of the new hot things out there. With a different set of technologies and ideas compared to traditional virtual machines, it implements something similar and at the same time different, with the idea of containers: almost all VMs power but much faster and with very interesting additional goodies. In this article I assume you already know something ...

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Java Facts to Blow your Mind! (infographic)

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With the release of Java 8 scheduled for the coming days, we were on the lookout for some Java facts that would really capture the effect of this programming language to the world. So, we decided to create a simple infographic depicting some important stats about the history of Java. The main source of information was Oracle’s Java Timeline. We ...

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Postgres and Oracle compatibility with Hibernate

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There are situations your JEE application needs to support Postgres and Oracle as a Database. Hibernate should do the job here, however there are some specifics worth mentioning. While enabling Postgres for application already running Oracle I came across following tricky parts: BLOBs support, CLOBs support, Oracle not knowing Boolean type (using Integer) instead and DUAL table. These were the ...

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