Monthly Archives: May 2012


One of the thing that can be a bit tricky when using JAXB is to map a java.util.Map to XML. In this example we have a provider object. The provider has a name and a map containing properties.

Below is the provider XML document:

And then the Provider class:

JAXB sees the properties object in the XML document as a list of property entries. Therefore we need to transform the list into a map. To do this we need three supporting classes. The first one is the class containing the entry, or property:

Next we need the class that contains the list of entries, or the properties:

To transform the list into a map we need an XmlAdapter. An XmlAdapter is a class that instructs JAXB on how to marshal and unmarshal an object that does not conform to the JAXB standard. This could for example be a class without a public no args constructor, or as in our case the provider properties map:

Now what is left is to tell JAXB to use the XmlAdaptor when handling the properties field. To do this we use the @XmlJavaTypeAdapter annotation. Below is the fully annotated Provider class:

I have finally install Java 7 on my laptop. The Java install runs just fine. Getting maven to find it however was a little tricky.

To make Maven find Java 7 the JAVA_HOME variable is required again. This hasn't been used for a while since Maven have been able to find Java anyway. But with the switch to 7 Maven still uses Java 6 by default.

I always use .bash_profile to change my environment variables since I tend not to need them else were. It is located in the users home directory (I.E. ~/.bash_profile).

The path to the new Java install is '/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/'. So the complete setting should look like this:


When this has been configured Maven will use Java 7.