Bean creation via an instance factory method

[debasishg]

Hi -

When I am creating a bean via instance factory method, can I specify in the xml an argument for "factory-method" ? e.g. in the following snippet, can I specify that my factory method createInstance() takes an argument which determines the exact type of bean instantiated.

<!-- The factory bean, which contains a method called <literal>createInstance()</literal> -->
<bean id="myFactoryBean" class="...">
...
</bean>
<!-- The bean to be created via the factory bean -->
<bean id="exampleBean"
factory-bean="myFactoryBean"
factory-method="createInstance"/>

This is useful if the factory creates a polymorphic type, where the actual type instantiated will depend on this argument.

Please help.

- Debasish

[Andreas Senft]

From the spring-beans.dtd:

The factory method can have any number of arguments. Autowiring is not
supported. Use indexed constructor-arg elements in conjunction with the
factory-method attribute.

Hope that helps,
Andreas

[debasishg]

Thanks a lot .. I should have looked at the example in the Spring reference doc.

[socram]

Hi -

<!-- The factory bean, which contains a method called <literal>createInstance()</literal> -->
<bean id="myFactoryBean" class="...">
...
</bean>
<!-- The bean to be created via the factory bean -->
<bean id="exampleBean"
factory-bean="myFactoryBean"
factory-method="createInstance"/>

myFactoryBean should create differente beans based on some values passed to createInstance() but these values are known only at runtime; At config time I know only the type (String, int ...) of the parameters of createInstance(). Is it possible to do this? how?

Thanks in advance

[Andreas Senft]

Maybe have a look here. Code is also available.

Regards,
Andreas