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Community
Know how persist document in the Cassandra in a way fairly simple
In JUG-AFRICA we started an Open Source project to manage the BIG ANNUAL EVENTS for our JUGs. The first release will be available in the early second half of January.
The application will provide a lot of services via the REST Web services.
FESI Research Program Overview
FESI is the Free and open source software Enterprise Solutions Institute. We are a research program designed to study tomorrow's internet technologies as a means to teach folks in the local workforce how to use technologies our customers will likely want to implement. We also perform this research to prepare local engineers with the knowledge and...
For meanwhile more than 25 years I am writing computer programs. More than a decade I spent with programs accessing databases, virtually always relational ones. I soon learned that this is rather hard work. Not only that you need to know about the theory behind RDBMS iself, but also you need to know the technical APIs (like ODBC, ADO, RDO, JDBC, JDO, JPA, CMP, ...), the structure of...
Databases
Virgil, the GUI and REST layer for Cassandra, now also provides a command-line interface (virgil-cli) and a thrift daemon to interact with.
Love Cassandra? Love REST? Wish you could have both at the same time? Now you can.
Yesterday Liquid Robotics announced its Pacific Crossing (PacX) Challenge. Four Wave Glider robots with oceanographic sensors will launch from California attempting to travel the longest distance at sea ever completed by an unmanned marine vehicle. Best science from the collected oceanographic data wins the Challenge.
Open source communities are attacking ETL, but are there any solutions attacking Master Data Management?
How to persist an enumeration using JPA when your database contains characters that are illegal in Java?
in JPA it is possible to map String-data to enumerated values. But you are limited to Strings that are legal to be used in enum-types. E.g. using '-' or plain numbers will not work. But you may use a bit of Reflection in your enum to override the defaults.
Using MySQL database with GlassFish is nothing new. However I just wanted to share a small note on how I used MySQL DB from GlassFish which is embedded in my test. Life is much easier when I am able to run the test without having pre-installation of GlassFish/MySQL.
A simple demo of the Spring and mybatis integration
Automated functional tests are key to ensure the quality of large applications in incremental development processes. In contrast with unit tests where each test is supposed to be independent from the outside environment, functional tests are really integration tests: in order for them to run properly the process must start from a well known state.
The majority of enterprise applications use a...
One of the big focuses of Maven 3 is to provide a more reliable, more stable and better performing build tool. And one big area of improvement is Performance.
Maven 3 has the (new and somewhat experimental) ability to analyze your project structure, and the dependencies between your modules, to figure out which modules can be built in parallel. This has major performance implications for larger...
Finally iAnywhere answered my prayers and implemented support for JDBC batch mode into their latest (and fastest) driver. But at surprisingly bad performance. Let's see why.
The problem at hand is that EclipseLink (great project lead by James Sutherland) does not use a query cache when dealing with ReadAll queries, i.e: all calls to getResultList() go to the database. Some object-level caching is performed by avoiding construction of new objects based on the primary key values the database call returns. EclipseLink compares the PK values returned by the...
Content available at: http://blogs.sun.com/arungupta/entry/totd_133_jpa2_jpql_criteria
Last week's kickoff of FESI's research program went very well. There are a number of folks (>500) who are now following this blog on Java.net, and a number who have gotten involved. While we wait for more folks, we'll be researching new technologies, the first being NOSQL databases.
If the kind of topics we're research interests you, please feel free to join the project;...
If you wonder whether the style of use with JDBC API has an impact of performance, you might like to read my latest blog entry on Head Crashing Informatics. While the entry mostly is about tuning SQL Anywhere's BLOB handling performance, it contains an interesting aspect: There are three ways to deal with BLOBs in JDBC, and the performance difference is tremendous. While obvious for the JDBC...
A big part of my current company work is related to managing infrastructure hosted in cloud computing environments. I have recently released an open source project (Rain Toolkit) to help ease the management of Amazon EC2 objects. It is a set of command-line tools for performing day-to-day administration tasks.
Since Rain Toolkit deals with the management of EC2 resources, it seemed only...
Accessibility
The www.abelski.com web site offers free (for personal and academic usage) courses about various topics in software development. The site focuses on Java technologies.
