About Thorben Janssen

Thorben Janssen is a senior developer with more than 10 years of experience in Java EE development and architecture. During these years he acted as developer, architect, project and/or technical lead to create high available, clustered mobile billing solutions and laboratory information management systems.

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Java EE Pitfalls #1: Ignore the default lock of a @Singleton

EJB Singleton Beans were introduced by the EJB 3.1 specification and are often used to store cached data. This means, we try to improve the performance of our application by using a ...
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Testing with Aliens: How to test a JPA type converter with Arquillian

This post was written together with +Aslak Knutsen (@aslakknutsen). JPA type converters provide an easy way to define how an entity attribute gets persisted to the database. You can ...
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How to use a JPA Type Converter to encrypt your data

A few days ago, I read an interesting article by Bear Giles about Database encryption using JPA listeners from 2012. He discusses his requirement for an encryption solution and provides ...
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JPA 2.1 Entity Graph – Part 2: Define lazy/eager loading at runtime

This is my second post on JPA 2.1 Entity Graphs. The first post described the usage of named entity graphs. These can be used to define a graph of entities and/or attributes at compile ...
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JPA 2.1 Entity Graph – Part 1: Named entity graphs

Lazy loading was often an issue with JPA 2.0. You have to define at the entity if you want to use FetchType.LAZY (default) or FetchType.EAGER to load the relation and this mode is always ...
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Generate your JAXB classes in a second with xjc

Since JAXB is part of the JDK, it is one of the most often used frameworks to process XML documents. It provides a comfortable way to retrieve and store data from XML documents to Java ...
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SSL encrypted EJB calls with JBoss AS 7

Encrypting the communication between client and server provides improved security and privacy protection for your system. This can be an important requirement by the customer, especially ...
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JPA 2.1 Type Converter – The better way to persist enums

Persisting enums with JPA 2.0 is possible, but there is no nice way to do it. Using the @Enumerated annotation, you can use EnumType.ORDINAL or EnumType.STRING to map the enum value ...
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