Conditional statement inside Spring config

Question

How to have conditional statement within a spring configuration file

I have String bean (b) whose value depends on the value of a property (a). a is set dynamically

Answer 1

As Ryan said SpEL can help. You should be able to do something like this in Spring xml:

<bean id="flag" class="java.lang.Boolean">
    <constructor-arg value="#{ systemProperties['system.propery.flag'] ?: false }" />
</bean>

<bean id="bean" class="com.my.MyBean">
    <property name="property" value="#{ flag ? 'yes' : 'no' }"/>
</bean>

Answer 2

Try this...It works.. Given Roll,Location,name is in property file and I am reading it above this line.

<bean id="Student" class="beans.Student"> <property name="name" value="#{ ${Roll}== 1 ? '${Location}' : '${name}' }"/> </bean>

Answer 3

See Spring Expression Language for Spring 3+. Otherwise, you're probably stuck with writing a FactoryBean or something similar.

Answer 4

below is working for me. system property passed as java -Dflag=true -jar project.jar

 <bean id="flag" class="java.lang.Boolean">
    <constructor-arg value="#{ systemProperties['flag'] ?: false }" />
  </bean>

  <bean id="bean" class="com.my.MyBean">
    <property name="property" value="#{ flag ? 'yes' : 'no' }"/>
 </bean>