Java Platform, Enterprise Edition (Java EE) 8 The Java EE Tutorial

## About CDI Managed Beans

A managed bean is implemented by a Java class, which is called its bean class. A top-level Java class is a managed bean if it is defined to be a managed bean by any other Java EE technology specification, such as the JavaServer Faces technology specification, or if it meets all the following conditions.

- It is not a nonstatic inner class.

- It is a concrete class or is annotated `@Decorator`.

- It is not annotated with an EJB component-defining annotation or declared as an EJB bean class in `ejb-jar.xml`.

- It has an appropriate constructor. That is, one of the following is the case.

  - The class has a constructor with no parameters.

  - The class declares a constructor annotated `@Inject`.

No special declaration, such as an annotation, is required to define a managed bean.

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