grails beans definition returns null pointer exception

Question

I'm trying to define a bean for class that will handle connections to mongodb beans definition

beans = {
    dbCon(DbConnImpl){
        mongoClient = ref("mongo_client")
        dbName = "myDb"
    }

    mongo_client(MongoClient, "localhost", 27017)
    }

DbConnImpl:

class DbConnImpl {
    MongoClient mongoClient
    String dbName

    public DB getDB(){
        return mongoClient.getDB(dbName)
    }

    void setMongoClient(MongoClient mongoClient) {
        this.mongoClient = mongoClient
    }

    void setDbName(String dbName) {
        this.dbName = dbName
    }
}

and the usage:

class UserController {
    DbConnImpl dbConn


    def index() {
        DB db = dbConn.getDB()

        def colls = db.getCollectionNames()
        render colls
    }
}

error: NullPointerException : Cannot invoke method getDB() on null object

Can someone please advise? Thanks! Roy

Answer 1

The name of your bean is dbCon so you need the same name in the controller:

class UserController {
    DbConnImpl dbCon
}