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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.