how rebuild lucene indexes over hibernate search jpa with mongodb - mongodb

Question

I have accidentally deleted my index directory, now i am trying to rebuild all indexes.
I am using the hibernate search with JPA, lucene and MONGODB.
the following method is returning no results
public void rebuildIndex()throws Exception{
org.hibernate.search.jpa.FullTextEntityManager fem = org.hibernate.search.jpa.Search.getFullTextEntityManager(entityManager);
org.hibernate.search.query.dsl.QueryBuilder queryBuilder = fem.getSearchFactory().buildQueryBuilder().forEntity(Person.class).get();
org.apache.lucene.search.Query query = queryBuilder.all().createQuery();
FullTextQuery fullTextQuery = fem.createFullTextQuery(query, Person.class);
//fullTextQuery.initializeObjectsWith(ObjectLookupMethod.SKIP, DatabaseRetrievalMethod.FIND_BY_ID);
System.out.println(fullTextQuery.toString());
List<Person> results = fullTextQuery.getResultList();
fem.clear();
System.out.println(results.size());
for(Person p : results){
fem.index( p );
fem.flushToIndexes();
fem.clear();
}
//fem.createIndexer().startAndWait();
}
the method is returning no result. how should I get all data from mongoDb to rebuild index?

Answer 1

as hibernate search didn't work with criteria neither with JPQL and has his own JP-QL parser.
I couldn't create a findAll method to retrieve all objetcs
the only way was use a native mongoDb query:
org.hibernate.search.jpa.FullTextEntityManager fem = org.hibernate.search.jpa.Search.getFullTextEntityManager(entityManager);
Mongo mongo = new Mongo("127.0.0.1", 27017);
DB db = mongo.getDB("mainBase");
DBCollection dbCollection = db.getCollection("Persons");
DBCursor cursor = dbCollection.find();
Collection<String> ids = new ArrayList<String>();
String id = "";
while (cursor.hasNext()) {
id = cursor.next().get("_id").toString();
System.out.println(id);
ids.add(id);
}
System.out.println(">"+ids.size());
Person pes;
for(String p : ids){
pes = new Person();
pes.setId(p);
pes = find(pes);
System.out.println("indexing: "+pes.getId());
fem.index( pes );//index each element
fem.flushToIndexes();//apply changes to indexes
fem.clear();//free memory since the queue is processed
}