spring: set property of one bean by reading the property of another bean?

Question

Is it possible to set the property of one bean by reading the property of another bean? For instance, suppose I had:

class A {
   void setList(List list);
}
         


        

Answer 1

If you are trying to do the same for a constructor then do this.

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
            <constructor-arg type="javax.sql.DataSource" value="#{jdbc.dataSource}">            
            </constructor-arg>
</bean>

Here "jdbc" is as mentioned below that has property "dataSource" with getter and setter and initilized as:

<bean id="jdbc" class="com.la.activator.DataSourceProvider">
    <property name="myDataSourcePool" ref="dsPoolService"/>
</bean>

Answer 2

in addition to @Kevin's answer if you are using spring 3.0 it is possible to do this with the new spring expression language

<bean id="a" class="A">
    <property name="list"
        value="#{b.list}"/>
</bean>

spring 3.0 documentation

Answer 3

There are a couple of ways. Here is one:

<bean id="b" class="B"/>
<bean id="a" class="A">
    <property name="list">
        <bean class="org.springframework.beans.factory.config.PropertyPathFactoryBean">
            <property name="targetObject" ref="b"/>
            <property name="propertyPath" value="list"/>
        </bean>
    </property>
</bean>

Also see the <util:property-path/> element