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Frequently Asked Questions

Using Litho with React Native

React Native ships with its own version of Yoga which can cause conflicts when merging the dex files. In order to avoid this, you can instruct Gradle to exclude one of the Yoga modules.

To do this, add a section like this to your Gradle file after the dependency declaration:

configurations.all {
  exclude group: 'com.facebook.yoga', module: 'yoga'
  exclude group: 'com.facebook.litho', module: 'litho-annotations'
  resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
}

For more information, check out issue #224.

Forcing newer versions of the Support Library

If you want to override the version of the support library Litho requires, you can set the overrides in your build.gradle:

configurations.all {
  resolutionStrategy {
    force 'com.android.support:appcompat-v7:26.+'
    force 'com.android.support:support-compat:26.+'
    force 'com.android.support:support-core-ui:26.+'
    force 'com.android.support:support-annotations:26.+'
    force 'com.android.support:recyclerview-v7:26.+'
  }
}

Could not initialize class com.facebook.yoga.YogaNode

If you are getting this error when running a Litho unit test, go through these steps:

  • Ensure Java 8 is correctly set up. If you are on a Mac, make sure that which java points to something like /Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home/bin/java and not /usr/bin/java. Otherwise, update your $PATH accordingly.

For Buck

  • Make sure your tests use the components_robolectric_test which sets up the necessary dependencies on the native libraries.
  • If your tests use PowerMock, use the components_robolectric_powermock_test or set the fork_mode manually to per_test which ensures that class loaders aren't reused across threads.
  • Try buck kill and buck clean.
  • If everything else fails, reboot.

For Gradle

  • Follow the instructions under Unit Testing - Caveats for your setup.
  • Relaunch the gradle daemon with ./gradlew --stop.

@InjectProp fails for generated components

When using parallel build systems like Buck, it can be difficult for the build system to determine the correct order to generate sources in. This can lead to essential type information being unavailable, making it impossible to determine the fully qualified name. If a component A tries to use @InjectProp for another generated component B, this can fail if B is part of the same compilation unit, but sits in a different package.

The easiest workaround for this is to help the compiler by moving either the referencing or the referenced component into a separate build module. Splitting build modules by package is considered a good practice with Buck.