Problems with Instant Run (Android Studio 2.0 beta 4) and Retrofit

This morning I was playing with a toy app I have which uses Retrofit, and I’ve found the following problem with it (and Instant Run):

02-16 07:41:55.550 2976-2976/ A/art: art/runtime/] Throwing new exception 'length=227; index=1017' with unexpected pending exception: java.lang.ArrayIndexOutOfBoundsException: length=227; index=1017

The exception was in the call itself, so it was either Retrofit doing strange things or something deeper. I found the problem to be because of some interaction between ART and Instant Run, and it was already reported.

The original reporter has opened a bug in the AOSP and it’s still unsolved. See also (Retrofit).

All in all, currently there is no fully reliable solution. So, if you find this problem in a call using Retrofit, the best course of action is to disable Instant Run and rebuild. Preferences -> Build, Execution, Deployment -> Instant Run -> (uncheck) Enable Instant Run to hot swap code/resource changes on deploy (default enabled)

Disable Instant Run

Hilarious Git plugin: git-blame-someone-else

This plugin allows to change the commit author information. Super-useful to avoid to be the one to blame for bugs and mistakes. ;)

“I love git-blame-someone-else!!” –Linus Torvalds says*

*Linus Torvalds didn’t really approve of this. It’s a joke to prove it works. See his fake commit here

Kotlin RC and kotlinx

I’ve been toying with Kotlin for a while. Yesterday RC was released, making it one step closer to have a stable version.

One small change that has made me scratch my head a little, even if I read the solution, has been the changes regarding Kotlin Extensions. This had been integrated with the main Kotlin plugin (instead of being a separated plugin) but on RC you need to change your Gradle file a little to keep using it.

The symptom is that you find an “Unresolved reference: kotlinx” plus others that come from the same namespace. Resolution is easy: in the announcement for the release Kotlin 1.0 Release Candidate is Out! in the section Tooling, it reads (bold is mine):

To enable Android Extensions in Gradle in a more idiomatic way, we now say:

apply plugin: 'kotlin-android-extensions'

in the build.gradle file (individually for each project).

The old way doesn’t work any more and prints fixing instructions to the output.

So, I haven’t found this instructions, but the solution is easy: apply the new kotlin-android-extensions plugin right after the kotlin-android plugin in your gradle file. Usually, the end result will be like this:

apply plugin: ''
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

After that you just need to sync your Gradle configuration and rebuild the whole project.