Skip to main content
View by: Most Recent | Topic | Community | Webloggers   
Monthly Archives:    

Blogs by topic Java Enterprise and user mkarg

• Accessibility • Ajax • Blogging • Business • Community 
• Databases • Deployment • Distributed • Eclipse • Education 
• EJB • Extreme Programming • Games • GlassFish • Grid 
• GUI • IDE • Instant Messaging • J2EE • J2ME 
• J2SE • Jakarta • JavaFX • JavaOne • Jini 
• JSP • JSR • JXTA • LDAP • Linux 
• Mobility • NetBeans • Open Source • OpenSolaris • OSGi 
• P2P • Patterns • Performance • Porting • Programming 
• Research • RMI • RSS Feeds • Search • Security 
• Servlets • Struts • Swing • Testing • Tools 
• Virtual Machine • Web Applications • Web Design • Web Development Tools • Web Services and XML 


Web Services and XML

It actually happened a few weeks ago already, but I simply didn't find the time to spread the word earlier -- just too much other stuff to do (see end of posting), so I tell you now: WebDAV Support for JAX-RS 1.2 is out! What has happened since 1.1? First of all, 1.2 is a complete internal overhaul, which not only finally is covered with unit tests rather completely (which revealed several...
on Mar 1, 2014

Programming

JAX-RS 2.0: A first interim report It's been a few months already that the expert group of JSR 339 started discussion about the details of JAX-RS 2.0. The target defined by spec lead Oracle are clear: Java EE 7 shall have a RESTful API that augments current JAX-RS 1.1 API by (among others) a Client API, HATEOAS support and asynchronous invocations. So what's the status with state? As three corner...
on Jul 24, 2011
Update (2012-09-24): Maven users, you can directly link this class (LGPL), as I have uploaded it into Maven Central. Simply add a dependency to: <dependency>    <groupId>eu.headcrashing.treasure-chest</groupId>    <artifactId>EnumerationsClass</artifactId>    <version>...
on Jul 4, 2010
There are times when things hurt so much that you feel urged to blog about them once solved. This is one of them. Our company is using XSL heavily for reporting (generating vector charts in PDFs on the fly from data analyzed by GlassFish), so it is not very amazing that we found some bugs in the XSL transformer (a.k.a "JAXP Implementation") contained in GlassFish. As we're not so fast...
on Mar 16, 2010
Several APIs demand that the user is implementing the .hashCode() method. The reason is that these APIs are using hash based containers (like HashMap) to have a fast means of managing lots of objects (always comparing objects using .equals() would need endless time). There are lots of standard implementations on the web, so the question is, what performance impact the implemenation of .hashCode...
on Jan 3, 2010

Education

Often code has a bad smell, then it gets time to replace custom lines by common patterns. Sometimes it even makes sense to even replace a single line of code by a class just wrapping that single line (which actually increases code size), if that makes readers better understand what the code does. Unfortunately often such patterns are publicly known but do not exist as ready to...
on Jan 1, 2011
What it means to speak German fluently and to be able of C++ Several years ago one of our key coders moved from the south of Germany (where our HQ is located at the Black Forest) to the cold and rainy north, so we had to to find a suitable substitute. After screening lots of applications, we picked few to invite for an interview. It declared the candidate's ability to speak German and C++. So she...
on Feb 20, 2010

Databases

In my opinion, SQL Anyhwere is the best RDBMS I can think of. I can remember when we started distributing it in Germany back in the early 1990ies, as one of the first early adopters in this country. Since then, we provided it to hundreds of enterprises, from single-person laptop-only ones to large ones spanning replicated installations crossing country borders. So call me biased in that...
on Jul 3, 2010
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...
on Apr 10, 2010
On last saturday I have run a few experimental benchmarks on the typical new generation technology stack (or part of it). What I exactly did was running iAnywhere 10.0.1 database and Sun Application Server 9 (aka "Glassfish" aka "Java EE 5 SDK") in a VMware Server 1.0.3 virtual machine on my private laptop (AMD Turion 64 X2, 2 GB RAM). The benchmark was done using a small test...
on Jan 3, 2010
I used my free day to do some more performance benchmarking using EJB 3.0 and WebServices. As I wrote in my last blog entry on this topic, I was astonished what performance is possible even in a VM on my cheat laptop. But now I invested some more time to tune my laptop (running JkDefrag gave its disk an amazing push) and do an optimization in the application itself: Using precompiled queries...
on Jan 3, 2010
I did some experiments with JPA, which is a really cool and simple API for entity persistence. In fact, writing an entity bean is as simple as writing a pojo plus adding some single annotations like @Entity and @Id (to identify the PK fields). That's it. Cool. :-) See this sample code: @Entity public class MySample { @Id private int x; public int getX() { return this.x; } public...
on Jan 3, 2010
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...
on Jan 3, 2010

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...
on Feb 28, 2010
For many years I am using XSLT now for a lot of tasks in both, development and runtime environments: Source generation, creating HTML from XML data, or even rendering SVG vector graphics from XML finance data. But what really bothered me was that the XSLT transformer contained in Java (even in Java 6's latest release) was just able to do XSLT 1.0 but not XSLT 2.0. XSLT (and XPath) 2.0 comes with...
on Feb 6, 2010
Over the past decade, OpenSource became a big hype. At the peak of the hype, big stakeholders like IBM, Oracle and Sun (and even Microsoft and SAP) turned a lot of their previously proprietary code into OpenSource. While they tell us that they do it because they are so noble and like to exploit the community's knowledge, typically the open sourced software is only for free in part or is still...
on Dec 10, 2009

JSR

RESTless about RESTful These days there is much discussion about REST and HATEOAS, and many people feel urged to reinterpret what HATEOAS means or what Roy Fielding's often-cited dissertation allegedly would say in their understanding, and what HATEOAS should be implemented like therefore. While I first felt amused about this "dispute about nothing" (just ask Mr Fielding if you don't...
on Feb 14, 2010