Jena tip: optimising database load times
Loading lots of data into a persistent Jena model can often take quite a bit of time. There are, however, some tips for speeding things up. Let’s get the baseline...
From the ministry of confusing error messages
When JBoss says this: Caused by: java.lang.IllegalArgumentException: URL cannot be null at org.jboss.webservice.metadata.jaxrpcmapping.JavaWsdlMappingFactory.parse(JavaWsdlMappingFactory.java:55) it may mean (well, it did in my case) that you’ve accidentally mis-typed the name of jaxrpc-mapping.xml....
Tutorials good, understanding better
I’m working with web-services and with J2EE at present, two technologies that have a bewildering collection of components and configuration options (and configuration descriptors) by themselves. The Cartesian product of...
JBoss Eclipse IDE - XDoclet not working
The time has come for me to get serious about learning J2EE. I’ve started on a new project, and the code is going to run in JBoss. So naturally, I’ve...
Comparison of upper ontologies
Interesting paper comparing approaches to upper ontologies from the MITRE Corporation, via the Ontolog forum. The authors’ focus is supposedly on US Government applications, but I think that the conclusions...