Spring Data MongoDB

The primary goal of the Spring Data project is to make it easier to build Spring-powered applications that use new data access technologies such as non-relational databases, map-reduce frameworks, and cloud based data services.

The Spring Data MongoDB project aims to provide a familiar and consistent Spring-based programming model for new datastores while retaining store-specific features and capabilities. The Spring Data MongoDB project provides integration with the MongoDB document database. Key functional areas of Spring Data MongoDB are a POJO centric model for interacting with a MongoDB Document and easily writing a repository style data access layer.

Code of Conduct

This project is governed by the Spring Code of Conduct. By participating, you are expected to uphold this code of conduct. Please report unacceptable behavior to spring-code-of-conduct@pivotal.io.

Getting Started

Here is a quick teaser of an application using Spring Data Repositories in Java:

public interface PersonRepository extends CrudRepository<Person, Long> {

  List<Person> findByLastname(String lastname);

  List<Person> findByFirstnameLike(String firstname);
}

@Service
public class MyService {

  private final PersonRepository repository;

  public MyService(PersonRepository repository) {
    this.repository = repository;
  }

  public void doWork() {

    repository.deleteAll();

    Person person = new Person();
    person.setFirstname("Oliver");
    person.setLastname("Gierke");
    repository.save(person);

    List<Person> lastNameResults = repository.findByLastname("Gierke");
    List<Person> firstNameResults = repository.findByFirstnameLike("Oli*");
 }
}

@Configuration
@EnableMongoRepositories
class ApplicationConfig extends AbstractMongoClientConfiguration {

  @Override
  protected String getDatabaseName() {
    return "springdata";
  }
}

Maven configuration

Add the Maven dependency:

<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-mongodb</artifactId>
  <version>${version}.RELEASE</version>
</dependency>

If you’d rather like the latest snapshots of the upcoming major version, use our Maven snapshot repository and declare the appropriate dependency version.

<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-mongodb</artifactId>
  <version>${version}.BUILD-SNAPSHOT</version>
</dependency>

<repository>
  <id>spring-libs-snapshot</id>
  <name>Spring Snapshot Repository</name>
  <url>https://repo.spring.io/libs-snapshot</url>
</repository>

Upgrading from 2.x

The 4.0 MongoDB Java Driver does no longer support certain features that have already been deprecated in one of the last minor versions. Some of the changes affect the initial setup configuration as well as compile/runtime features. We summarized the most typical changes one might encounter.

XML Namespace

Table 1. Changed XML Namespace Elements and Attributes:

Element / Attribute	2.x	3.x
`<mongo:mongo-client />`	Used to create a `com.mongodb.MongoClient`	Now exposes a `com.mongodb.client.MongoClient`
`<mongo:mongo-client replica-set="…" />`	Was a comma delimited list of replica set members (host/port)	Now defines the replica set name. Use `<mongo:client-settings cluster-hosts="…" />` instead
`<mongo:db-factory writeConcern="…" />`	NONE, NORMAL, SAFE, FSYNC_SAFE, REPLICAS_SAFE, MAJORITY	W1, W2, W3, UNAKNOWLEDGED, AKNOWLEDGED, JOURNALED, MAJORITY

Table 2. Removed XML Namespace Elements and Attributes:

Element / Attribute	Replacement in 3.x	Comment
`<mongo:db-factory mongo-ref="…" />`	`<mongo:db-factory mongo-client-ref="…" />`	Referencing a `com.mongodb.client.MongoClient`.
`<mongo:mongo-client credentials="…" />`	`<mongo:mongo-client credential="…" />`	Single authentication data instead of list.
`<mongo:client-options />`	`<mongo:client-settings />`	See `com.mongodb.MongoClientSettings` for details.

Table 3. New XML Namespace Elements and Attributes:

Element	Comment
`<mongo:db-factory mongo-client-ref="…" />`	Replacement for `<mongo:db-factory mongo-ref="…" />`
`<mongo:db-factory connection-string="…" />`	Replacement for `uri` and `client-uri`.
`<mongo:mongo-client connection-string="…" />`	Replacement for `uri` and `client-uri`.
`<mongo:client-settings />`	Namespace element for `com.mongodb.MongoClientSettings`.

Java Configuration

Table 4. Java API changes

Type	Comment
`MongoClientFactoryBean`	Creates `com.mongodb.client.MongoClient` instead of `com.mongodb.MongoClient` Uses `MongoClientSettings` instead of `MongoClientOptions`.
`MongoDataIntegrityViolationException`	Uses `WriteConcernResult` instead of `WriteResult`.
`BulkOperationException`	Uses `MongoBulkWriteException` and `com.mongodb.bulk.BulkWriteError` instead of `BulkWriteException` and `com.mongodb.BulkWriteError`
`ReactiveMongoClientFactoryBean`	Uses `com.mongodb.MongoClientSettings` instead of `com.mongodb.async.client.MongoClientSettings`
`ReactiveMongoClientSettingsFactoryBean`	Now produces `com.mongodb.MongoClientSettings` instead of `com.mongodb.async.client.MongoClientSettings`

Table 5. Removed Java API:

2.x	Replacement in 3.x	Comment
`MongoClientOptionsFactoryBean`	`MongoClientSettingsFactoryBean`	Creating a `com.mongodb.MongoClientSettings`.
`AbstractMongoConfiguration`	`AbstractMongoClientConfiguration` (Available since 2.1)	Using `com.mongodb.client.MongoClient`.
`MongoDbFactory#getLegacyDb()`	-	-
`SimpleMongoDbFactory`	`SimpleMongoClientDbFactory` (Available since 2.1)
`MapReduceOptions#getOutputType()`	`MapReduceOptions#getMapReduceAction()`	Returns `MapReduceAction` instead of `MapReduceCommand.OutputType`.
`Meta\|Query` maxScan & snapshot

Other Changes

UUID Types

The MongoDB UUID representation can now be configured with different formats. This has to be done via MongoClientSettings as shown in the snippet below.

Example 1. UUID Codec Configuration

static class Config extends AbstractMongoClientConfiguration {

    @Override
    public void configureClientSettings(MongoClientSettings.Builder builder) {
        builder.uuidRepresentation(UuidRepresentation.STANDARD);
    }

    // ...
}

Getting Help

Having trouble with Spring Data? We’d love to help!

Check the reference documentation, and Javadocs.
Learn the Spring basics – Spring Data builds on Spring Framework, check the spring.io web-site for a wealth of reference documentation. If you are just starting out with Spring, try one of the guides.
If you are upgrading, check out the changelog for “new and noteworthy” features.
Ask a question - we monitor stackoverflow.com for questions tagged with spring-data-mongodb. You can also chat with the community on Gitter.
Report bugs with Spring Data MongoDB at jira.spring.io/browse/DATAMONGO.

Reporting Issues

Spring Data uses JIRA as issue tracking system to record bugs and feature requests. If you want to raise an issue, please follow the recommendations below:

Before you log a bug, please search the issue tracker to see if someone has already reported the problem.
If the issue doesn’t already exist, create a new issue.
Please provide as much information as possible with the issue report, we like to know the version of Spring Data that you are using and JVM version.
If you need to paste code, or include a stack trace use JIRA {code}…{code} escapes before and after your text.
If possible try to create a test-case or project that replicates the issue. Attach a link to your code or a compressed file containing your code.

Building from Source

You don’t need to build from source to use Spring Data (binaries in repo.spring.io), but if you want to try out the latest and greatest, Spring Data can be easily built with the maven wrapper. You also need JDK 1.8.

 $ ./mvnw clean install

If you want to build with the regular mvn command, you will need Maven v3.5.0 or above.

Also see CONTRIBUTING.adoc if you wish to submit pull requests, and in particular please sign the Contributor’s Agreement before your first non-trivial change.

Building reference documentation

Building the documentation builds also the project without running tests.

 $ ./mvnw clean install -Pdistribute

The generated documentation is available from target/site/reference/html/index.html.

Guides

The spring.io site contains several guides that show how to use Spring Data step-by-step:

Accessing Data with MongoDB is a very basic guide that shows you how to create a simple application and how to access data using repositories.
Accessing MongoDB Data with REST is a guide to creating a REST web service exposing data stored in MongoDB through repositories.

Examples

Spring Data Examples contains example projects that explain specific features in more detail.

License

Spring Data MongoDB is Open Source software released under the Apache 2.0 license.

wonwoo/spring-data-mongodb