# How to create geckoview FAT AAR?

**URL:** <https://discourse.mozilla.org/t/how-to-create-geckoview-fat-aar/136743>\
**Category:** Developer Tools\
**Tags:** learning\
**Created:** [October 26, 2024, 3:10pm UTC](https://discourse.mozilla.org/t/how-to-create-geckoview-fat-aar/136743 "2024-10-26T15:10:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![devel2ew](https://avatars.discourse-cdn.com/v4/letter/d/9e8a1a/32.png) [@devel2ew](https://discourse.mozilla.org/u/devel2ew)\
**Post date:** [October 26, 2024, 3:10pm UTC](https://discourse.mozilla.org/t/how-to-create-geckoview-fat-aar/136743/1 "2024-10-26T15:10:44Z")

</div>

How to create FAT AAR with multiple architectures?  
AAR and POM files are included (released build). Firefox 131 source.

root@9e6bfae6b70f:/firefox/mozilla-unified# ./mach configure --disable-compile-environment --enable-application=mobile/android  
root@9e6bfae6b70f:/firefox/mozilla-unified# ./mach build android-fat-aar-artifact -v  
os.nice(19)  
0:00.45 W Clobber not needed.  
Parallelism determined by memory: using 15 jobs for 16 cores based on 15.0 GiB RAM and estimated job size of 1.0 GiB  
0:00.51 /usr/bin/gmake -j15 android-fat-aar-artifact  
0:00.52 /usr/bin/gmake recurse\_android-fat-aar-artifact  
0:00.53 gmake[1]: Entering directory ‘/firefox/mozilla-unified/obj-x86\_64-pc-linux-gnu’  
0:00.54 /root/.mozbuild/srcdirs/mozilla-unified-6cd42f69fc1c/\_virtualenvs/build/bin/python -m mozbuild.action.fat\_aar --armeabi-v7a /firefox/libtarget/_armeabi_.aar --arm64-v8a /firefox/libtarget/_arm64-v8a_.aar --distdir /firefox/mozilla-unified/obj-x86\_64-pc-linux-gnu/dist/fat-aar  
0:02.86 Allowed: Path “chrome/toolkit/content/global/buildconfig.html” has architecture-specific versions:  
0:02.86 arm64-v8a -\> 1e389d539f32975d95a0c446c805a6297bfc5a4f  
0:02.86 armeabi-v7a -\> d698760ad2c4c1f3ed8c3fbfb00dffdba4038607  
0:02.86 Allowed: Path “classes.jar!/org/mozilla/geckoview/BuildConfig.class” has architecture-specific versions:  
0:02.86 arm64-v8a -\> 1b5708390d8ebbbc6ed1941f58a43addcc67d5f8  
0:02.86 armeabi-v7a -\> 1414edc9b46869fe73ebf4607ea9c25fc0f06ce2  
0:02.86 Disallowed: Path “classes.jar!/org/mozilla/geckoview/CrashHandler$1.class” has architecture-specific versions:  
0:02.86 arm64-v8a -\> ca1989bb7ec70146267ee221294c3711b43b88a8  
0:02.86 armeabi-v7a -\> aaa115ed98601b61531b8b4c200a3283345d2fce  
0:02.86 Disallowed: Path “modules/AppConstants.sys.mjs” has architecture-specific versions:  
0:02.86 arm64-v8a -\> 7799bc26fa4723e8ec733eeda2486f9f1483f480  
0:02.87 armeabi-v7a -\> fde8573a104189c8d39cf189a4460488361e7906  
0:02.92 gmake[1]: \*\*\* [Makefile:139: recurse\_android-fat-aar-artifact] Error 1  
0:02.92 gmake[1]: Leaving directory ‘/firefox/mozilla-unified/obj-x86\_64-pc-linux-gnu’  
0:02.92 gmake: \*\*\* [/firefox/mozilla-unified/config/recurse.mk:34: android-fat-aar-artifact] Error 2  
0:03.12 W 0 compiler warnings present.  
Hey! Builds initiated with `mach build $A_SPECIFIC_TARGET` may not always work, even if the code being built is correct. Consider doing a bare `mach build` instead.  
root@9e6bfae6b70f:/firefox/mozilla-unified#

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<div class="post-metadata">

**Author:** ![salatiga](https://avatars.discourse-cdn.com/v4/letter/s/c77e96/32.png) [@salatiga](https://discourse.mozilla.org/u/salatiga)\
**Post date:** [December 14, 2025, 12:58pm UTC](https://discourse.mozilla.org/t/how-to-create-geckoview-fat-aar/136743/2 "2025-12-14T12:58:10Z")

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I’m having exactly the same output. Were you able to get it running? @devel2ew

Edit: Found the solution! [1759727 - Add documentation for how to produce Android GeckoView universal (fat) AAR s locally](https://bugzilla.mozilla.org/show_bug.cgi?id=1759727#c5)

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<div class="post-metadata">

**Author:** ![Devel\_EWeb](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/devel_eweb/32/75829_2.png) [@Devel\_EWeb](https://discourse.mozilla.org/u/Devel_EWeb)\
**Post date:** [December 19, 2025, 12:17am UTC](https://discourse.mozilla.org/t/how-to-create-geckoview-fat-aar/136743/3 "2025-12-19T00:17:40Z")

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Previously, the aar files for 64-bit and v7a have been generated and copied to /firefoxnew/libs.

mozconfig

```auto
export MOZILLA_OFFICIAL=1
mk_add_options AUTOCLOBBER=1
ac_add_options --disable-compile-environment
ac_add_options --enable-project=mobile/android
ac_add_options --enable-official-branding
ac_add_options --with-branding=browser/branding/official
ac_add_options --with-branding=mobile/android/branding/official
ac_add_options --enable-release
mk_add_options AUTOCLOBBER=1
ac_add_options --disable-tests
ac_add_options --disable-debug
mk_add_options MOZ_FETCHES_DIR=/firefox/mozilla-unified/
mk_add_options MOZ_ANDROID_FAT_AAR_ARCHITECTURES=armeabi-v7a,arm64-v8a
mk_add_options MOZ_ANDROID_FAT_AAR_ARM64_V8A=/firefoxnew/libs/geckoview-arm64.aar
mk_add_options MOZ_ANDROID_FAT_AAR_ARMEABI_V7A=/firefoxnew/libs/geckoview-v7a.aar

```

```auto
./mach build

```

```auto
ValueError: Maven zip "/firefoxnew/libs/geckoview-arm64.aar" with more than one candidate AAR found: []

```

**It worked for me up to version 142, but after version 143 it started to fail, always with that error.**

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<div class="post-metadata">

**Author:** ![Devel\_EWeb](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/devel_eweb/32/75829_2.png) [@Devel\_EWeb](https://discourse.mozilla.org/u/Devel_EWeb)\
**Post date:** [January 18, 2026, 12:57pm UTC](https://discourse.mozilla.org/t/how-to-create-geckoview-fat-aar/136743/5 "2026-01-18T12:57:50Z")

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SOLVED  
Instead of specifying the .AAR file, compress the files into ZIP format. “zip file.zip file.arr” and specify the ZIP files instead of the AAR files in the environment variables.