Generate Hibernate/JPA Annotation gives "Cannot generate annotations for an interface or enumeration" for several classes in java file

this is trivial test example:
package org.small.jpa;
class bbb {
public double id2 = 2.0;
public bbb() {}
};
class eee {
public int id = 0;
public eee() {}
};
at least we should discuss howto handle such situation. Generally I think it should annotate all classes.