A compendium of things I’ve found valuable when using Linux and other related open-source software
ORM and Imprecise Data Types
JPA is great in a lot of ways. But there’s one problem a lot of people have with JPA and ORM in general – imprecise keys. Technically, this is as much a JDBC problem as an ORM problem. It just seems to cause more problems in ORM. Perhaps because ORM lets you concentrate less on the raw data […]
Detached objects and JSF
JSF and JPA have proven to be more problematic than expected. The upside of the JSF framework is that the datamodel objects can be presented more or less right up to the page view layer without recourse to Data Transer Objects (DTOs). The downside, is that what’s presented isn’t always clear, leading to the dreaded OptimisticLockingException. Officially, you […]
OpenJPA, Tomcat6, Spring and Hibernate
Getting all of the above to play together can be tricky. I knocked myself offline for nearly 2 days after the latest upgrade. Broken Tomcat/Eclipse The sysdeo Tomcat plugin no longer works when my testapp is installed – the log says the WebAppClassLoader (todo: check name) cannot be found. Something’s messed up the core Tomcat classpath. Fortunately the […]