Recently, I put together a Spring demonstration for jclouds, the Java cloud library. This quickly turned into unexpected multi-dimensional experiment in integrating Guice, Google App Engine and Spring, but after much trial-and-error I finally came across a configuration that does the trick - or at least works¹ as well as seems possible on GAE. (more...)

Tags: GAE, Google App Engine, Guice, Javaconfig, jclouds, Spring
Filed under Amazon Webservices, Frameworks, Java, Spring | 4 Comments »

Spring is a great framework for dependency injection and it comes with a lot of support classes and utilities for all kind of things. Hibernate is a persistence service with a lot of useful features, that is relatively easy to use. Configuring both frameworks is not always easy. Configuring them together is sometimes hard and it is easy to make mistakes.

This blog addresses a problem in a configuration that is fairly common: use Spring for transaction management on top of a JTA provider and use Hibernate for persistence. Transaction demarcation is easy and declarative with Spring. The problem is that Hibernate sometimes needs to detect the current transaction and this needs to be configured. This leads to hard to detect bugs in applications that rely on auto flushing.
(more...)

Tags: auto flush, Hibernate, JTA, Spring
Filed under Hibernate, JTA, Spring | 4 Comments »