Realm Blog

Realm Java 0.79.0

We recently released a Realm Java update to this website and to Maven. This release includes support for primary keys, and Realm now adds 70% less weight to your APK!

Primary Keys

You’ve been asking for primary keys ever since our first Java release — finally, we’re happy to announce that this much-needed feature is supported by Realm. Simply use the @PrimaryKey annotation. Only String and integer (short, int, and long) fields can be used as primary keys.

ARM64 support

Nexus 9 users rejoice. The ARM64 processor is now among the architectures we support.

Realm Library Size Decreased by ~70%

Realm used to add around 3MB to your APK size. Thanks to some C++ optimizations, this should now be down to about 800KB for ARM devices, if you use a split APK. You can read more about how you can achieve this on our blog.

Minor improvements

  • We have added the method RealmQuery.not() which can negate a condition. It is very useful with beginGroup()/endGroup() when you need to negate a part of a condition.
  • The error messages have improved a few places, and Realm.deleteRealmFile() will throw an exception when an instance of the Realm is still open.
  • The Realm.allObjectSorted() has been reimplemented for better performance.

Deprecated methods

A number of methods were deprecated in 0.76, and they are now removed. Realm.allObjectsSorted() and RealmQuery.findAllSorted() need to be used instead.


Thanks for reading. Now go forth and build amazing apps with Realm! As always, we’re around on the mailing list, Stack Overflow, GitHub, and Twitter.


Realm Team

At Realm, our mission is to help developers build better apps faster. We provide a unique set of tools and platform technologies designed to make it easy for developers to build apps with sophisticated, powerful features — things like realtime collaboration, augmented reality, live data synchronization, offline experiences, messaging, and more.

Everything we build is developed with an eye toward enabling developers for what we believe the mobile internet evolves into — an open network of billions of users and trillions of devices, and realtime interactivity across them all.

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