What are beans in java?

Question

Java

Good evening everyone!

See, I ran into a problem while figuring out bean definitions in Java. In different sources, the definitions are radically different, which is why I came to the conclusion that the term bean means different things in different industries. I found the following variations:

1. Normal bean. A serializable class with private fields, getters/setters and a public constructor with no arguments.
2. Spring bean. A class that is used by spring in a DI container (a regular class in spring, in short, subject to dependency).
3.Enterprise Java Bean. A class used in JavaEE. There are three types, some of which are divided into subtypes, etc...

Tell me, what are the real types of beans in Java 3? Or have I screwed up somewhere?