Question

Class with Maps

public class Page {
    private Map<LocaleWrapper, String> titles;
    private Map<LocaleWrapper, String> texts;

    (...)
}

Key class

public class LocaleWrapper implements Serializable {
    private Locale locale;

    //Constructor, getter, setter
}

My IDE throws an error:

Basic attributes can only be of the following types: (...), or any Serializable type.

Why does my IDE throw this error and how can I fix my mappings?
Thanks in advance.

Answer 1

This error, AFAIK, is displayed because the attribute is inside a JPA entity, and not just a simple class.

And Map is not serializable.

Do you really want to save the whole map as a serialized byte array, in a BLOB column? If so, choose a serializable type, like HashMap. If not, then the map needs to define some form of association between entities and/or embedded types, and I would first think about how you want to store the information in the database, and map the database schema to entities.