How to Configure SpringBootApp with a Mongo Production Database

Question

I am creating a Spring Boot App with Mongo DB and scratching my head a bit with how to set up the production database configuration.

With a SQL-based Database, I'd be used to setting up a data source bean like this

@Bean
public DataSource getDataSource()
{
    DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create();
    dataSourceBuilder.driverClassName("org.h2.Driver");
    dataSourceBuilder.url("jdbc:h2:file:C:/temp/test");
    dataSourceBuilder.username("sa");
    dataSourceBuilder.password("");
    return dataSourceBuilder.build();
}

However,

1. It doesn't seem to be needed - my local app connects to a spun up instance of mongo db without any explicit configuration.
2. It doesn't seem to be a standard with mongo according to [this post][1]

I figured I'd give it a go to see if it would automagically configure in production, but I'm getting a DataAccessResourceFailureException. Info: heroku, did the mLab MongoDB add on.

I have no problem getting the url and I can certainly throw that in an environment variable, but I'm just not sure what I need to add to my app to configure it.

Answer 1

Set values in application.properties file like below

spring.data.mongodb.database = ${SPRING_DATA_MONGODB_DATABASE}
spring.data.mongodb.host = ${SPRING_DATA_MONGODB_HOST}
spring.data.mongodb.port = ${SPRING_DATA_MONGODB_PORT}

You can use the @Value annotation and access the property in whichever Spring bean you're using

@Value("${userBucket.path}")
private String userBucketPath;

The Externalized Configuration section of the Spring Boot docs, explains all the details that you might need.