使用Spring Boot时来自mongodb的数据

Question

I am using Spring boot with spring data. I have a mongodb and has the following record inside it:

{ "_id" : ObjectId("5914281fae0fe519943367c7"), "_class" : "example.model.Customer", "username" : "test", "password" : "test", "message" : "test" }

I am trying to create a function in which it retrieves data from the record using their username and password. This is what I have so far:

public class findExistingUser {
@Autowired
MongoTemplate mongoTemplate;
public Customer findUser(String username, String password){
    Query query = new Query();
    query.addCriteria(Criteria.where("username").is(username).and("password").is(password));
    return mongoTemplate.findOne(query, Customer.class, "customer");
}
}

But for some reason I get a null pointer exception. When I debug, mongotemplate seems to be null.

Answer 1

Below properties should be available in application.properties

spring.data.mongodb.host=localhost spring.data.mongodb.port=27017 spring.data.mongodb.database=app1

And below dependecies should be available in pom

org.springframework.data:spring-data-mongodb:1.10.0.RELEASE org.mongodb:mongodb-driver:3.4.1