Spring - Injecting main bean into property bean

Question

I am trying to configure such a relation in spring:

MyObject myObject = new MyObject(); myObject.setEntity( new Entity(this) );

is it possible?

When I am trying such a configuration:

<bean id="myObject" class="MyObject" scope="request"> <property name="entity"> <bean class="Entity"> <constructor-arg ref="myObject"/> </bean> </property> </bean>

It returns: [java] Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'myObject': Requested bean is currently in creation: Is there an unresolvable circular reference?

I am thinking about using factory-method for this, but maybe someone has better idea?

What is ref="com.electrabel.relay.BounceRelay"?

axtavt
– axtavt

2011-06-06 11:46:56 +00:00
Commented Jun 6, 2011 at 11:46 — axtavt
– axtavt, Commented Jun 6, 2011 at 11:46

Jigar Joshi · Accepted Answer · 2011-06-06 11:41:17Z

2

Try with setter injection

answered Jun 6, 2011 at 11:41

Jigar Joshi

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1 Comment

firen Over a year ago

Not working. That same Exception as in constructor injection.

Patryk Dobrowolski · Accepted Answer · 2011-06-06 12:31:18Z

First, ref references to bean id, not to class' qualified name.

I guess, you want to do something like this:

public class Entity { public Entity(A param) { // ... } } public class A { public setEntity(A param) { // ... } }

I'm not sure you can inject Entity while creating A. But you should be able to do this:

<bean id="a" class="A"> <property name="entity"> <ref local="en" /> </property> </bean> <bean id="en" class="Entity"> <constructor-arg ref="a" /> </bean>

Not working. Maybe there is any lazy-initialization in spring?

gpeche · Accepted Answer · 2011-06-06 12:56:46Z

I would not try to do all that via Spring. Also I would rely more on setter injection:

<!-- applicationContext.xml --> ... <bean id="main" class="Main"> ... <property name="myObject" ref="myObject"/> ... </bean> <bean id="entity" class="Entity"> ... </bean> ... <bean id="myObject" class="MyObject" scope="request"> <property name="entity" ref="entity"/> </bean> // your code public class Main { ... public void setMyObject(MyObject o) { ... // Manually inject *this* reference into *entity* Entity e = o.getEntity(); e.setMain(this); ... } ... } public class MyObject { ... public void setEntity(Entity e) { ... } public Entity getEntity() { ... } ... } public class Entity { ... public void setMain(Main m) { ... } ... }

In the above example, you manually inject this into entity instead of trying to do it with Spring. That simplifies code / configuration. Also everything is done via setter injection to avoid possible circularities.

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