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3.3. Configuring a service

Injecting references between POJO instances is one way of configuring a service however we can also inject values into POJO properties. The following deployment descriptor shows how we can configure the HRManager instance to have a hiring freeze and the AgeBasedSalaryStrategy to have new minimum and maximum salary values:

<?xml version="1.0" encoding="UTF-8"?>

<deployment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="urn:jboss:bean-deployer:2.0 bean-deployer_2_0.xsd"

   <bean name="HRService" class="org.jboss.example.service.HRManager">
     <property name="hiringFreeze">false</property>
     <property name="salaryStrategy"><inject bean="AgeBasedSalary"/></property>

   <bean name="AgeBasedSalary" class="org.jboss.example.service.util.AgeBasedSalaryStrategy">
     <property name="minSalary">1000</property> <property name="maxSalary">80000</property>

As with wiring POJOs together the classes need to have public setter methods for the relevant properties so that values can be injected. For example the HRManager class has a setHiringFreeze(boolean hiringFreeze) method and the AgeBasedSalaryStrategy class has setMinSalary(int minSalary) and setMaxSalary(int maxSalary) methods.

The values in the deployment descriptor are converted from strings into the relevant types (boolean, int etc...) by JavaBean PropertyEditors. A large number of these are provided by default for standard types but you can easily create your own if necessary. See the Properties chapter in Part II 'POJO Development' for more details.