Blogs by topic J2EE and user mkarg
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Education
Sometimes it makes sense to wrap a single code line into a class. An example is implementing the Range pattern.
A lot of applications these days title themselves RESTful. But how much REST is needed to be RESTful?
Programming
These days I got a feeling as if professional software products get worse with every release. One cause is a fatal misunderstanding of best practices by the big stakeholders. Looking at their current products, one should ask them to "Release Late, Release Rarely"!
Sick of XALAN bugs in GlassFish? Time to pimp your container!
Databases
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.
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...
WebServices and EJB 3 are lots faster than you might expect! On last saturday I have run a few experimental benchmarks and was quite impressed how fast Java EE 5 is, compared to its successor J2EE 1.4...
I used my free day to do some more performance benchmarking using EJB 3.0 and WebServices...
I did some experiments with JPA which is a really cool and simple API...
JPA comes with a way of doing triggers, which is pretty cool: EntityListeners. It is a simple POJO that is annotated as EntityListener, and that gets linked to the triggering event by some outside glue. That outside glue can be an XML deployment descriptor (has nothing to do with the EJB 2.1 XML deployment descriptor; is nothing else but an override to the annotations found in the Java source...
Community
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...
Like to use XSLT 2.0 but fear to switch to SAXON? Just drop saxon9he.jar into JRE's lib/ext folder and you're done! NO FEAR, IT WILL WORK.
As it seems, Marc and Paul (the leaders of JAX-RS / Jersey) really have understood what OpenSource really means: Communicate with the community, understand their needs and thoughts, accept their ideas. I would wish that more project leaders would assimilate this open mind and welcoming kind of leadership.
JSR
There is much discussion these days about HATEOAS (Hypermedia as the engine of application state) so it gets time to clearly say what HATEOAS actually means.
