How to autowire things in spring

In order to autowire something the following things must be true (that i know of)

• - The object you are autowiring needs to be annotated with @Component
• - The object that will contain the autowired object needs to come from the spring context, meaning:
• - applicationContext.xml needs to have a bean definition of it
• - the place where its is newed  needs to be replaced with the call to pull it from the WebApplicationContext

JdkDynamicAopProxy ClassCastException

Problem:
I am suddenly getting an error after some spring config was changed:

java.lang.ClassCastException: $Proxy47 cannot be cast to com.mycompany.MyConcreteClass

The code looks like this:
MyConcreteClass myClass = (MyConcreteClass) model.get("myClass");

I should add that MyConcreteClass was autoWired with spring elsewhere, and this setup used to work until something was changed in spring config.

Solution:
This is happening because we are casting to the concrete implementation, what needs to be done is that the object needs to be cast to the interface:
MyInterface myClass = (MyInterface) model.get("myClass");

Also, the relevant spring configuration that causes this issue is:

<tx:annotation-driven manager="springTransactionManager" ></tx:annotation-driven>

In order for the proxy to not proxy the interfaces but concrete classes, you need to add the following attribute to the above directive:
proxy-target-class="true"