Realm is a mobile database that runs directly inside phones, tablets or wearables. This repository holds the source code for the Java version of Realm, which currently runs only on Android.

Features

• Mobile-first: Realm is the first database built from the ground up to run directly inside phones, tablets and wearables.
• Simple: Data is directly exposed as objects and queryable by code, removing the need for ORM's riddled with performance & maintenance issues. Plus, we've worked hard to keep our API down to very few classes: most of our users pick it up intuitively, getting simple apps up & running in minutes.
• Modern: Realm supports easy thread-safety, relationships & encryption.
• Fast: Realm is faster than even raw SQLite on common operations, while maintaining an extremely rich feature set.

Getting Started

Please see the detailed instructions in our docs to add Realm to your project.

Documentation

Documentation for Realm can be found at realm.io/docs/java. The API reference is located at realm.io/docs/java/api.

Getting Help

• Need help with your code?: Look for previous questions on the #realm tag — or ask a new question. We activtely monitor & answer questions on SO!
• Have a bug to report? Open an issue. If possible, include the version of Realm, a full log, the Realm file, and a project that shows the issue.
• Have a feature request? Open an issue. Tell us what the feature should do, and why you want the feature.
• Sign up for our Community Newsletter to get regular tips, learn about other use-cases and get alerted of blogposts and tutorials about Realm.

Using Snapshots

If you want to test recent bugfixes or features that have not been packaged in an official release yet, you can use a -SNAPSHOT release of the current development version of Realm via Gradle, available on OJO

buildscript {
    repositories {
        maven {
            url 'http://oss.jfrog.org/artifactory/oss-snapshot-local'
        }
    }
    dependencies {
        classpath "io.realm:realm-gradle-plugin:<version>-SNAPSHOT"
    }
}

repositories {
    maven {
        url 'http://oss.jfrog.org/artifactory/oss-snapshot-local'
    }
}

See version.txt for the latest version number.

Building Realm

In case you don't want to use the precompiled version, you can build Realm yourself from source.

Prerequisites

• Make sure make is available in your $PATH.

• Download the JDK 7 or JDK 8 from Oracle and install it.

• Download & install s3cmd (brew install s3cmd on Mac, sudo apt-get install s3cmd on Ubuntu).

• Get .s3cfg file and put it in your home directory. If you'd like to put it other location, add s3cfg=<path to .s3cfg> in ~/.gradle/gradle.properties.

• Download & install the Android SDK Build-Tools 24.0.0, Android N (API 24) (for example through Android Studio’s Android SDK Manager).

• Download the Android NDK (= r10e) for OS X or Linux.

• Install CMake from SDK manager in Android Studio ("SDK Tools" -> "CMake").

• Or you can use Hombrew-versions to install Android NDK for Mac:

  brew tap homebrew/versions
  brew install android-ndk-r10e
  

• Add two environment variables to your profile:

  export ANDROID_HOME=~/Library/Android/sdk
  export ANDROID_NDK_HOME=/usr/local/Cellar/android-ndk-r10e/r10e
  

• If you want to build with Android Studio, ndk.dir has to be defined in the realm/local.properties as well.

  ndk.dir=/usr/local/Cellar/android-ndk-r10e/r10e
  

• If you are using OS X, you'd be better to add following lines to ~/.profile (or ~/.zprofile if the login shell is zsh) in order for Android Studio to see those environment variables.

  launchctl setenv ANDROID_HOME "$ANDROID_HOME"
  launchctl setenv ANDROID_NDK_HOME "$ANDROID_NDK_HOME"
  

• And if you'd like to specify the location to store the archives of Realm's core, set REALM_CORE_DOWNLOAD_DIR environment variable. It enables you to keep core's archive when executing git clean -xfd.

  export REALM_CORE_DOWNLOAD_DIR=~/.realmCore
  

  OS X users should also add following line to ~/.profile (or ~/.zprofile if the login shell is zsh) in order for Android Studio to see this environment variable..

  launchctl setenv REALM_CORE_DOWNLOAD_DIR "$REALM_CORE_DOWNLOAD_DIR"
  

Download sources

You can download the source code of Realm Java by using git. Since realm-java has git submodules, use --recursive when cloning the repository.

git clone [email protected]:realm/realm-java.git --recursive

or

git clone https://github.com/realm/realm-java.git --recursive

Build

Once you have completed all the pre-requisites building Realm is done with a simple command

./gradlew assemble

That command will generate:

• a jar file for the Realm Gradle plugin
• an aar file for the Realm library
• a jar file for the annotations
• a jar file for the annotations processor

Other Commands

• ./gradlew tasks will show all the available tasks
• ./gradlew javadoc will generate the Javadocs
• ./gradlew monkeyExamples will run the monkey tests on all the examples
• ./gradlew installRealmJava will install the Realm library and plugin to mavenLocal()
• ./gradlew clean -PdontCleanJniFiles will remove all generated files except for JNI related files. This saves recompilation time a lot.
• ./gradlew connectedUnitTests -PbuildTargetABIs=$(adb shell getprop ro.product.cpu.abi) will build JNI files only for the ABI which corresponds to the connected device.

Generating the Javadoc using the command above will report a large number of warnings. The Javadoc is generated, and we will fix the issue in the near future.

Gotchas

The repository is organized in six Gradle projects:

• realm: it contains the actual library (including the JNI layer) and the annotations processor.
• realm-annotations: it contains the annotations defined by Realm.
• realm-transformer: it contains the bytecode transformer.
• gradle-plugin: it contains the Gradle plugin.
• examples: it contains the example projects. This project directly depends on gradle-plugin which adds a dependency to the artifacts produced by realm.
• The root folder is another Gradle project and all it does is orchestrating the other jobs

This means that ./gradlew clean and ./gradlew cleanExamples will fail if assembleExamples has not been executed first. Note that IntelliJ does not support multiple projects in the same window so each sub-project must be opened in its own window.

Examples

The ./examples folder contain a number of example projects showing how Realm can be used. If this is the first time you checkout or pull a new version of this repository to try the examples, you must call ./gradlew installRealmJava from the top-level directory first. Otherwise the examples will not compile as they depend on all Realm artifacts being installed in mavenLocal().

Standalone examples can be downloaded from website.

Running Tests Using The Realm Object Server

Tests in realm/realm-library/src/syncIntegrationTest require a running testing server to work. A docker image can be built from tools/sync_test_server/Dockerfile to run the test server. tools/sync_test_server/start_server.sh will build the docker image automatically.

To run a testing server locally:

1. Install docker.

2. Run tools/sync_test_server/start_server.sh:

cd tools/sync_test_server
./start_server.sh

3. Run instrumentation tests:

cd realm
./gradlew connectedObjectServerDebugAndroidTest

Contributing

See CONTRIBUTING.md for more details!

This project adheres to the Contributor Covenant Code of Conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].

License

Realm Java is published under the Apache 2.0 license. The underlying core is available under the Realm Core Binary License while we work to open-source it under the Apache 2.0 license.

This product is not being made available to any person located in Cuba, Iran, North Korea, Sudan, Syria or the Crimea region, or to any other person that is not eligible to receive the product under U.S. law.

Feedback

If you use Realm and are happy with it, all we ask is that you please consider sending out a tweet mentioning @realm, announce your app on our mailing-list, or email [email protected] to let us know about it!

And if you don't like it, please let us know what you would like improved, so we can fix it!