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.
- 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.
Please see the detailed instructions in our docs to add Realm to your project.
Documentation for Realm can be found at realm.io/docs/java. The API reference is located at realm.io/docs/java/api.
- Need help with your code?: Look for previous questions on the #realm tag — or ask a new question. We actively monitor & answer questions on StackOverflow!
- 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.
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 JFrog OSS
buildscript {
repositories {
jcenter()
google()
maven {
url 'http://oss.jfrog.org/artifactory/oss-snapshot-local'
}
}
dependencies {
classpath "io.realm:realm-gradle-plugin:<version>-SNAPSHOT"
}
}
allprojects {
repositories {
jcenter()
google()
maven {
url 'http://oss.jfrog.org/artifactory/oss-snapshot-local'
}
}
}
See version.txt for the latest version number.
In case you don't want to use the precompiled version, you can build Realm yourself from source.
-
Download the JDK 8 from Oracle and install it.
-
Download & install the Android SDK Build-Tools 27.0.2, Android Oreo (API 27) (for example through Android Studio’s Android SDK Manager).
-
Install CMake from SDK manager in Android Studio ("SDK Tools" -> "CMake").
-
If you use Android Studio, Android Studio 3.0 or higher is required.
-
Realm currently requires version r10e of the NDK. Download the one appropriate for your development platform, from the NDK archive. You may unzip the file wherever you choose. For macOS, a suggested location is
~/Library/Android
. The download will unzip as the directoryandroid-ndk-r10e
. -
If you will be building with Android Studio, you will need to tell it to use the correct NDK. To do this, define the variable
ndk.dir
inrealm/local.properties
and assign it the full pathname of the directory that you unzipped above. Note that there is alocal.properites
in the root directory that is not the one that needs to be edited.ndk.dir=/Users/brian/Library/Android/android-ndk-r10e/r10e
-
Add two environment variables to your profile (presuming you installed the NDK in
~/Library/android-ndk-r10e
):export ANDROID_HOME=~/Library/Android/sdk export ANDROID_NDK_HOME=~/Library/Android/android-ndk-r10e
-
If you are launching Android Studio from the macOS Finder, you should also run the following two commands:
launchctl setenv ANDROID_HOME "$ANDROID_HOME" launchctl setenv ANDROID_NDK_HOME "$ANDROID_NDK_HOME"
-
If you'd like to specify the location in which to store the archives of Realm Core, define the
REALM_CORE_DOWNLOAD_DIR
environment variable. It enables you to keep Core's archive when executinggit clean -xfd
.export REALM_CORE_DOWNLOAD_DIR=~/.realmCore
macOS users must also run the following command for Android Studio to see this environment variable.
launchctl setenv REALM_CORE_DOWNLOAD_DIR "$REALM_CORE_DOWNLOAD_DIR"
It would be a good idea to add all of the symbol definitions (and their accompanying launchctl
commands, if you are using macOS) to your ~/.profile
(or ~/.zprofile
if the login shell is zsh
)
-
If you develop Realm Java with Android Studio, we recommend you to exclude some directories from indexing target by executing following steps on Android Studio. It really speeds up indexing phase after the build.
- Under
/realm/realm-library/
, selectbuild
,.externalNativeBuild
anddistribution
folders inProject
view. - Press
Command + Shift + A
to openFind action
dialog. If you are not using default keymap nor using macOS, you can find your shortcut key inKeymap
preference by searchingFind action
. - Search
Excluded
(notExclude
) action and select it. Selected folder icons should become orange (in default theme). - Restart Android Studio.
- Under
You can download the source code of Realm Java by using git. Since realm-java has git submodules, use --recursive
when cloning the repository.
git clone [email protected]:realm/realm-java.git --recursive
or
git clone https://github.com/realm/realm-java.git --recursive
Once you have completed all the pre-requisites building Realm is done with a simple command.
./gradlew assemble
That command will generate:
- a jar file for the Realm Gradle plugin
- an aar file for the Realm library
- a jar file for the annotations
- a jar file for the annotations processor
The full build may take an hour or more, to complete.
./gradlew tasks
will show all the available tasks./gradlew javadoc
will generate the Javadocs./gradlew monkeyExamples
will run the monkey tests on all the examples./gradlew installRealmJava
will install the Realm library and plugin to mavenLocal()./gradlew clean -PdontCleanJniFiles
will remove all generated files except for JNI related files. This reduces recompilation time a lot../gradlew connectedUnitTests -PbuildTargetABIs=$(adb shell getprop ro.product.cpu.abi)
will build JNI files only for the ABI which corresponds to the connected device. These tests require a running Object Server (see below)
Generating the Javadoc using the command above may generate warnings. The Javadoc is generated despite the warnings.
All gradle projects in this repository have wrapper
task to generate Gradle Wrappers. Those tasks refer to gradleVersion
property defined in /realm.properties
to determine Gradle Version of generating wrappers.
We have a script ./tools/update_gradle_wrapper.sh
to automate these steps. When you update Gradle Wrappers, please obey the following steps.
- Edit
gradleVersion
property in defined in/realm.properties
to new Gradle Wrapper version. - Execute
/tools/update_gradle_wrapper.sh
.
The repository is organized into 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 ongradle-plugin
which adds a dependency to the artifacts produced byrealm
.- The root folder is another Gradle project. All it does is orchestrate 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 of the six Gradle projects must be imported as a separate IntelliJ project.
Since the repository contains several completely independent Gradle projects, several independent builds are run to assemble it.
Seeing a line like: :realm:realm-library:compileBaseDebugAndroidTestSources UP-TO-DATE
in the build log does not imply
that you can run ./gradlew :realm:realm-library:compileBaseDebugAndroidTestSources
.
The ./examples
folder contains many 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.
To run these tests, you must have a device connected to the build computer, and the adb
command must be in your PATH
-
Connect an Android device and verify that the command
adb devices
shows a connected device:adb devices List of devices attached 004c03eb5615429f device
-
Run instrumentation tests:
cd realm ./gradlew connectedBaseDebugAndroidTest
These tests may take as much as half an hour to complete.
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:
-
Install docker.
-
Run
tools/sync_test_server/start_server.sh
:cd tools/sync_test_server ./start_server.sh
This command will not complete until the server has stopped.
-
Run instrumentation tests
In a new terminal window, run:
cd realm ./gradlew connectedObjectServerDebugAndroidTest
Note that if using VirtualBox (Genymotion), the network needs to be bridged for the tests to work.
This is done in VirtualBox > Network
. Set "Adapter 2" to "Bridged Adapter".
These tests may take as much as half an hour to complete.
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].
The directory realm/config/studio
contains lint and style files recommended for project code.
Import them from Android Studio with Android Studio > Preferences... > Code Style > Manage... > Import,
or Android Studio > Preferences... > Inspections > Manage... > Import. Once imported select the
style/lint in the drop-down to the left of the Manage... button.
Realm Java is published under the Apache 2.0 license.
Realm Core is also published under the Apache 2.0 license and is available here.
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.
If you use Realm and are happy with it, all we ask is that you, please consider sending out a tweet mentioning @realm to share your thoughts!
And if you don't like it, please let us know what you would like improved, so we can fix it!