Why should anybody put annotations on the getters or setters when using JPA to map the classes?

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Putting annotations on methods forces JPA to access properties via methods. It makes sense when internal state of your object differs from the database schema:

@Entity
public class Employee {
    private String firstName;
    private String lastName;

    @Column(name = "EMP_NAME") // Due to legacy database schema
    public String getName() {
        return fisrtName + " " + lastName;
    }

    public void setName(String name) {
        ...
    }

    ... Getters and setters for firstName and lastName with @Transient ...
}

In JPA 2.0 you can specify access type at fine-grained level with @Access:

@Entity @Access(AccessType.FIELD)
public class Employee {
    @Access(AccessType.PROPERTY) @Column(name = "EMP_NAME")
    public String getName() { ... }
    ... other properties have field access ...
}

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