Spring El Expression

Question

I'm switching from faces-config to Spring and wanted to know how you can pass a property from one bean to another:

e.g.

<bean id="myBean" class="Bean1">

 </bean>
 <bean id="myBean2" class="Bean2">
    <constructor-arg ref="#{myBean1.value}"/>
 </bean>

Can you add a little more context? Is there a reason you'd do this as opposed to having a property inject the same value into both beans. — Jherico, Jul 19 '10 at 19:31
Lets say I have a bean like User and I want to inject user.getLastLoginDate() into a loginBean.setLastLoginDate(Date date). This is quite normal thing to do in a faces-config. — DD., Jul 19 '10 at 20:34

score 0 · Accepted Answer · answered Jul 20 '10 at 18:05

0

Upgraded to Spring 3.0 which has spring el support

answered Jul 20 '10 at 18:05

DD.

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score -1 · Answer 2 · answered Jul 20 '10 at 15:40

First things first, the purpose of the D.I container is to fully initialize your system prior to execution; that is, all dependencies being set, the app is ready to run.

There are both @property and @value annotations in Spring for similar purposes, but since you want to use and specific bean property value for other bean the best solution would be:

<bean id="myBean" class="Bean1">

 </bean>
 <bean id="myBean2" class="Bean2">
    <constructor-arg ref="myBean"/>
 </bean>

If you argue that you just want to set the value at instantiation time, and not establish a dependency, then skip the D.I part and set the value directly.

Spring El Expression

2 Answers2