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Is there a way to use Spring lookup method inject with parameters? For example, I want to be able to instantiate prototype-scoped beans while passing them arbitrary parameters via constructor.
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Spring lookup method injection is the process of dynamically overriding a registered bean method. The bean method should be annotated with @Lookup. Spring returns the lookup result matched by the method's return type.
Why @Lookup Annotation in Spring. To put it in simple words, lookup method injection is the process to override a Spring bean at the runtime. The constructor and property are the most common used dependency injection methods. Both the options happen during the initialization of the Bean.
Why @Lookup? A method annotated with @Lookup tells Spring to return an instance of the method's return type when we invoke it. Essentially, Spring will override our annotated method and use our method's return type and parameters as arguments to BeanFactory#getBean.
lookup(Class<?> cl) method finds the descriptor for a class that can be serialized. Creates an ObjectStreamClass instance if one does not exist yet for class. Null is returned if the specified class does not implement java.
It looks like this vital feature was finally added in Spring 4.1.0.RC2. I have tested it and it seems to work.
It was added as part of JIRA ticket SPR-7431 ("Passing lookup-method arguments to created bean constructor"):
<lookup-method/> should allow specifying any number of parameters. These parameters should be passed directly to the constructor of the newly created bean.
For more info on how the feature was finally added, this blog post was written by the guy who opened the JIRA ticket.
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You can inject them via field/setter injection. (Note that constructor injection is frowned upon by spring, although it's supported)
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