How to return an ArrayList of objects in MongoDB and Java?

Question

I have a method in my DAO which looks like this

ProductDao.java

public List<Document> getAllProducts() {
    return mongoCollection.find().into(new ArrayList<Document>());
}

What I would like instead is

//return a list of Product instead of Document
public List<Product> getAllProducts() {
    return mongoCollection.find().into(new ArrayList<Product>());
}

pom.xml

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.3.0</version>
</dependency>

How can I achieve this?

RITZ XAVI · Accepted Answer · 2016-09-13 20:27:26Z

1

There are few java libs that can help you with it:

Morhpia - http://code.google.com/p/morphia/

Spring Data for MongoDB - http://www.springsource.org/spring-data/mongodb

Also, you can do something like:

public List<Product> getAllProducts() {
    DBCursor cur = mongoCollection.find();
    List<Product> products = new ArrayList<Product>();
    while(cur.hasNext()) {
        products.add(cur.next());
    }
    return products;
}

edited Sep 13, 2016 at 20:27

answered Sep 13, 2016 at 18:55

RITZ XAVI

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3 Comments

Nital Over a year ago

Keen on trying out Morphia. Looks promising. Is it a subproject of MongoDB ?

RITZ XAVI Over a year ago

Yes it is a sub project, Morphia is built on top of the original mongodb java driver. Its like a wrapper around it.

saeedeh Over a year ago

The problem with this is that it opens a connection every time the method is called, do you have any solution for this?

Prasad Khode · Accepted Answer · 2016-09-15 08:34:19Z

1

look into MongoJack.

Mongojack maps Java objects to MongoDB documents. Based on the Jackson JSON mapper, Mongojack allows you to easily handle your mongo documents as POJOs

edited Sep 15, 2016 at 8:34

Prasad Khode

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answered Sep 13, 2016 at 19:48

satish chennupati

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