How to solve Hibernate mapping exception for Set<Path> in java?

Question

I want to save directories to the DB for my file path tree, but I got this error when initializing Hibernate:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [hibernate-config.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Could not determine type for: java.nio.file.Path, at table: BasePlan_selectedPaths, for columns: [org.hibernate.mapping.Column(selected_paths)]

Here is my filePathTree:

@Column(name = "selected_paths")
@ElementCollection(targetClass = Path.class)
private Set<Path> selectedPaths;

Answer 1

I created a converter class. After that I modified my fields. Hibernate create a table that will save paths like a string.

public class PathConverter implements AttributeConverter<Path, String> {

    @Override
    public String convertToDatabaseColumn(Path path) {
        return path.toString();
    }

    @Override
    public Path convertToEntityAttribute(String path) {
        return Paths.get(path);
    }
}

@Column(name = "selected_paths")
@ElementCollection(targetClass = Path.class)
@Convert(converter = PathConverter.class)
private Set<Path> selectedPaths;

@Column(name = "unselected_paths")
@ElementCollection(targetClass = Path.class)
@Convert(converter = PathConverter.class)
private Set<Path> unSelectedPaths;