Spring data cross-store: nullpointer when check the existence of a @RelatedDocument

[stefano.cancedda]

Accessing an "hibrid" entity (part JPA e part mongoDB) obtained from a persistence context throw a null pointer exception when i try to read its mongoDb field using accessor method:

		List<Address> addresses = query.getResultList();
		for (Address address : addresses) {
			if(address.getSpatialInfo() == null){
				SpatialInfo si = new SpatialInfo();
				// filling bean properties here ....
				address.setSpatialInfo(si);
				this.mongo.save(si);  // <--- if i try to save the whole entity mongo save all entity properties as collections!!!!
			}
}

Simply, if no document has been associated with an entity (so I check for the nullity of the property) the program create and associate one in mongoDb.

Caused by: java.lang.NullPointerException
	at org.springframework.data.persistence.document.mongodb.MongoDocumentBacking.ajc$interMethod$org_springframework_data_persistence_document_mongodb_MongoDocumentBacking$org_springframework_data_persistence_document_DocumentBacked$get_persistent_id(MongoDocumentBacking.aj:183)
	at org.novaworks.data.Address.get_persistent_id(Address.java:1)
	at org.springframework.data.persistence.document.mongodb.MongoDocumentBacking.ajc$interMethodDispatch1$org_springframework_data_persistence_document_mongodb_MongoDocumentBacking$org_springframework_data_persistence_document_DocumentBacked$get_persistent_id(MongoDocumentBacking.aj)
	at org.novaworks.data.Address.spatialInfo_aroundBody3$advice(Address.java:230)
	at org.novaworks.data.Address.getSpatialInfo(Address.java:268)
	at org.novaworks.plan.ui.panel.MutableLocalEntityPanel.getGisDataSupportModel(MutableLocalEntityPanel.java:431)

So: there's a way to check if a persistent entity has already been associated with a document beside is relational part?

[stefano.cancedda]

I've noticed that the entity (in this case Address) has been weaved with DocumentBacked interface and not the @Document bean itself (SpatialInfo), but probably it's correct while document must be accessed by relation with the entity acting as a "parent", It's strange that no weaving has been applied to the bean annotated with @Document ...

By the way, there are the sources of two beans involved.
I hope someone can help me because I'm stuck

ENTITY BEAN:

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.ManyToMany;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;

import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;
import org.hibernate.validator.constraints.Length;

import org.novaworks.data.documents.SpatialInfo;
import org.springframework.data.persistence.document.RelatedDocument;

@Entity
@Table( name = "LOCATIONS" )
@Cache(region="long_lived", usage = CacheConcurrencyStrategy.READ_WRITE)
public class Address extends AbstractPersistentEntity {

    private static final long serialVersionUID = -3606726741408514823L;	
	
    @Length(max = 150)
    @NotNull
    private String street;	
	
    @Length(max = 50)
    @NotNull
    private String city;
    
    @Length(max = 50)
    @Pattern(regexp = "^\\d*$")   
    private String code;
    
    @Length(max = 50)
    @NotNull
    private String country;
    private String reference;

    private String number;
	
    @Column(name="FLOOR")
    private String floor; 
    private String area;
    
    @Transient
    @RelatedDocument
    private SpatialInfo spatialInfo;

    
    @ManyToMany( fetch = FetchType.LAZY , mappedBy = "addresses")
    private Set<Contact> contacts;
    
    
    public Address() {}
    
    // ... accessors
}

DOCUMENT BEAN:

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document
public class SpatialInfo {
	
    @Id
    private String id;
	
    private double latitude;
    private double longitude;
    private double altitude;
        
    // ... accessors
}