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It seems that it is impossible to have database-stored null or empty strings for domain properties annotated with {{ @Facet }} .
I tried the configuration below:
{ { code}
@Entity
@Indexed
@Table(name = "issuer")
public class IndexedObject implements Serializable {
@Column
@Fields({ @Field, @Field(name = "city_na", analyze = Analyze.NO, indexNullAs = "_null_") })
@Facet(forField = "city_na")
private String city;
}
{code } }
a call to persist on a newly created {{ IndexedObject() }} will yield the following exception:
{ { noformat}
Caused by: java.lang.NullPointerException
at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.addFacetDocValues(DocumentBuilderIndexedEntity.java:664)
at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.buildDocumentFieldsForProperties(DocumentBuilderIndexedEntity.java:646)
at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.buildDocumentFields(DocumentBuilderIndexedEntity.java:463)
at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.getDocument(DocumentBuilderIndexedEntity.java:395)
at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.createAddWork(DocumentBuilderIndexedEntity.java:299)
at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.addWorkToQueue(DocumentBuilderIndexedEntity.java:240)
}}
{noformat}
The documentation states (5.4.1.1) that " {quote} null values should be avoided ." {quote} , not that null values are not supported. I do understand that null/empty fields cannot be indexed, but I thought that was the goal of the {{ @Field }} property {{ indexNullAs }} , in order to have a marker in the index for null values. However it seems that the conversion from null in the index does not take this setting into account.
The only bypass that I have found is to define a default, non-null, non-empty value to any indexed property used in conjunction with {{ @Facet }} within my domain object. That is extremely inconvenient since I would have to handle that specific "_null_" (for example) value throughout my application instead of only when filtering on facets.
Please let me know if I have missed something, or if there is a configuration bypass.
Thanks,
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