= Spring Data MongoDB image:https://jenkins.spring.io/buildStatus/icon?job=spring-data-mongodb%2Fmain&subject=Build[link=https://jenkins.spring.io/view/SpringData/job/spring-data-mongodb/] image:https://img.shields.io/badge/Revved%20up%20by-Develocity-06A0CE?logo=Gradle&labelColor=02303A["Revved up by Develocity", link="https://ge.spring.io/scans?search.rootProjectNames=Spring Data MongoDB"]

The primary goal of the https://spring.io/projects/spring-data[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 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]]
== Code of Conduct

This project is governed by the https://github.com/spring-projects/.github/blob/main/CODE_OF_CONDUCT.md[Spring Code of Conduct]. By participating, you are expected to uphold this code of conduct. Please report unacceptable behavior to spring-code-of-conduct@spring.io.

[[getting-started]]
== Getting Started

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

[source,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("Drotbohm");
    repository.save(person);

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

@Configuration
@EnableMongoRepositories
class ApplicationConfig extends AbstractMongoClientConfiguration {

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

[[maven-configuration]]
=== Maven configuration

Add the Maven dependency:

[source,xml]
----
<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-mongodb</artifactId>
  <version>${version}</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.

[source,xml]
----
<dependency>
  <groupId>org.springframework.data</groupId>
  <artifactId>spring-data-mongodb</artifactId>
  <version>${version}-SNAPSHOT</version>
</dependency>

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

[[upgrading]]
== Upgrading

Instructions for how to upgrade from earlier versions of Spring Data are provided on the project https://github.com/spring-projects/spring-data-commons/wiki[wiki].
Follow the links in the https://github.com/spring-projects/spring-data-commons/wiki#release-notes[release notes section] to find the version that you want to upgrade to.

[[getting-help]]
== Getting Help

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

* Check the
https://docs.spring.io/spring-data/mongodb/reference/[reference documentation], and https://docs.spring.io/spring-data/mongodb/docs/current/api/[Javadocs]
* Learn the Spring basics – Spring Data builds on Spring Framework, check the https://spring.io[spring.io] web-site for a wealth of reference documentation.
If you are just starting out with Spring, try one of the https://spring.io/guides[guides].
* Ask a question - we monitor https://stackoverflow.com[stackoverflow.com] for questions tagged with https://stackoverflow.com/tags/spring-data[`spring-data-mongodb`].
* Report bugs with Spring Data MongoDB at https://github.com/spring-projects/spring-data-mongodb/issues[github.com/spring-projects/spring-data-mongodb/issues].

[[reporting-issues]]
== Reporting Issues

Spring Data uses Github 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 https://github.com/spring-projects/spring-data-mongodb/issues[issue tracker] to see if someone has already reported the problem.
* If the issue does not already exist, https://github.com/spring-projects/spring-data-mongodb/issues/new[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, the JVM version, Stacktrace, etc.
* Ideally provide a complete https://stackoverflow.com/help/minimal-reproducible-example[minimal sample] (something that we can unzip or git clone, build, and deploy) that reproduces the problem.
* If you need to paste code, or include a stack trace use https://guides.github.com/features/mastering-markdown/[Markdown] code fences +++```+++.

[[guides]]
== Guides

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

* https://spring.io/guides/gs/accessing-data-mongodb/[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.
* https://spring.io/guides/gs/accessing-mongodb-data-rest/[Accessing MongoDB Data with REST] is a guide to creating a REST web service exposing data stored in MongoDB through repositories.

[[examples]]
== Examples

* https://github.com/spring-projects/spring-data-examples/[Spring Data Examples] contains example projects that explain specific features in more detail.

[[building-from-source]]
== Building from Source

You do not need to build from source to use Spring Data. Binaries are available in https://repo.spring.io[repo.spring.io]
and accessible from Maven using the Maven configuration noted <<maven-configuration,above>>.

NOTE: Configuration for Gradle is similar to Maven.

The best way to get started is by creating a Spring Boot project using MongoDB on https://start.spring.io[start.spring.io].
Follow this https://start.spring.io/#type=maven-project&language=java&platformVersion=3.0.0&packaging=jar&jvmVersion=17&groupId=com.example&artifactId=demo&name=demo&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.demo&dependencies=data-mongodb[link]
to build an imperative application and this https://start.spring.io/#type=maven-project&language=java&platformVersion=3.0.0&packaging=jar&jvmVersion=17&groupId=com.example&artifactId=demo&name=demo&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.demo&dependencies=data-mongodb-reactive[link]
to build a reactive one.

However, if you want to try out the latest and greatest, Spring Data MongoDB can be easily built with the https://github.com/takari/maven-wrapper[Maven wrapper]
and minimally, JDK 17 (https://www.oracle.com/java/technologies/downloads/[JDK downloads]).

In order to build Spring Data MongoDB, you will need to https://www.mongodb.com/try/download/community[download]
and https://docs.mongodb.com/manual/installation/[install a MongoDB distribution] and https://www.docker.com/products/docker-desktop/[Docker].

Once you have installed MongoDB, you need to start a MongoDB server. It is convenient to set an environment variable to
your MongoDB installation directory (e.g. `MONGODB_HOME`).

To run the full test suite, a https://docs.mongodb.com/manual/tutorial/deploy-replica-set/[MongoDB Replica Set]
is required.

To run the MongoDB server enter the following command from a command-line:

[source,bash]
----
$ $MONGODB_HOME/bin/mongod --dbpath $MONGODB_HOME/runtime/data --ipv6 --port 27017 --replSet rs0
...
"msg":"Successfully connected to host"
----

Once the MongoDB server starts up, you should see the message (`msg`), "_Successfully connected to host_".

Notice the `--dbpath` option to the `mongod` command. You can set this to anything you like, but in this case, we set
the absolute path to a sub-directory (`runtime/data/`) under the MongoDB installation directory (in `$MONGODB_HOME`).

You need to initialize the MongoDB replica set only once on the first time the MongoDB server is started.
To initialize the replica set, start a mongo client:

[source,bash]
----
$ $MONGODB_HOME/bin/mongo
MongoDB server version: 8.0.0
...
----

Then enter the following command:

[source,bash]
----
mongo> rs.initiate({ _id: 'rs0', members: [ { _id: 0, host: '127.0.0.1:27017' } ] })
----

Finally, on UNIX-based system (for example, Linux or Mac OS X) you may need to adjust the `ulimit`.
In case you need to, you can adjust the `ulimit` with the following command (32768 is just a recommendation):

[source,bash]
----
$ ulimit -n 32768
----

You can use `ulimit -a` again to verify the `ulimit` for "_open files_" was set appropriately.

Now you are ready to build Spring Data MongoDB. Simply enter the following `mvnw` (Maven Wrapper) command:

[source,bash]
----
 $ ./mvnw clean install
----

If you want to build with the regular `mvn` command, you will need https://maven.apache.org/run-maven/index.html[Maven v3.8.0 or above].

Also see link:CONTRIBUTING.adoc[CONTRIBUTING.adoc] and add a _Signed-off-by_ trailer to your commits, if you wish to submit a pull request.

=== Building reference documentation

Building the documentation builds also the project without running tests.

[source,bash]
----
 $ ./mvnw clean install -Pantora
----

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

[[license]]
== License

Spring Data MongoDB is Open Source software released under the https://www.apache.org/licenses/LICENSE-2.0.html[Apache 2.0 license].