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Basic ideas about Apache Spark

 Big Data  Comments Off on Basic ideas about Apache Spark
Sep 112015
 

Apache Spark is a fast and general engine for large scale data processing. It is written in Scala, a functional programming language that runs in a JVM. It provides high-level APIs in Java, Scala, Python and R, and an optimized engine that supports general execution graphs. You can use Spark through Spark Shell for learning or data exploration (in Scala or Python, and since 1.4, in R) or through Spark Applications, for large scale data processing (mainly in Python, Scala or Java). Continue reading »

Basic ideas about Hadoop

 Big Data  Comments Off on Basic ideas about Hadoop
Sep 042015
 

Apache Hadoop is an open source software framework for storage and large scale processing of data-sets on clusters of commodity hardware. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Continue reading »

Support for SQL Server 2000 DTS

 DataBase, SQLServer  Comments Off on Support for SQL Server 2000 DTS
Aug 282015
 

Nowadays, SQL Server 2000 DTS is deprecated. If you try to open a DTS using SQL Server Management Studio 2005 or 2008 you will get the following error:

SQL Server 2000 DTS Designer components are required to edit DTS packages. Install the special Web download, “SQL Server 2000 DTS Designer Components” to use this feature.
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Customizing navigation and security in OpenXava

 Java, Web Development  Comments Off on Customizing navigation and security in OpenXava
Aug 122015
 

OpenXava does not include a complete security and navigation system, although you can easily add security and navigation in an OpenXava application if you use a Java portal, such as Liferay. Also, you can use the official solution that OpenXava team offers: XavaPro. Even though these solutions may be valid for new projects, for legacy projects you may need apply other ones. In this post we are going to customize our own solution for navigation and security starting from the standard OpenXava solution: NaviOX. Continue reading »

Main JSPs in OpenXava

 Java, Web Development  Comments Off on Main JSPs in OpenXava
Aug 112015
 

OpenXava is an AJAX Java Framework for rapid development of enterprise web applications. In OpenXava you only have to write the domain classes in plain Java to get a web application ready for production. Under the hood, there are a lot of JSPs that, magically, build all the pages on the fly. In spite of being an extensible and customizable framework, if you want to change the default behaviour of OpenXava projects, you will have to know how different JSPs are related each other.
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Reverse Engineering and Code Generation

 DataBase, Java, Web Development  Comments Off on Reverse Engineering and Code Generation
Aug 102015
 

The goal of this post is to explain how to model a database into java pojo classes with EJB or JPA annotations using reverse engineering. We can use several tools such as MinuteProject or Mogwai ERDesignerNG. In this post we are going to use JBoss Tools plugins for Eclipse (Hibernate Tools). With this tool not only can you configure files using JPA and EJB annotations, but also other annotations such as OpenXava. Continue reading »

Streams in Java 8

 Java  Comments Off on Streams in Java 8
Jul 252015
 

Streams are the key abstraction in Java 8 for processing collections of values and specifying what you want to have done, leaving the scheduling of operations to the implementation. Furthermore, streams can leverage multi-core architectures without you having to write a single line of multithread code, and simplify the description of aggregate computations, exponing opportunities for optimisation. Streams basically allow us to write collections-processing code at a higher level of abstraction.
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