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Missing class: java.lang.instrument.ClassFileTransformer #2266

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Anigif opened this issue Sep 23, 2020 · 1 comment
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Missing class: java.lang.instrument.ClassFileTransformer #2266

Anigif opened this issue Sep 23, 2020 · 1 comment
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@Anigif
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Anigif commented Sep 23, 2020

When building our Android app in release mode with gradle (and thereby also R8), the task minifyReleaseWithR8 gives the following warning: Missing class: java.lang.instrument.ClassFileTransformer

Removing the following line from the dependency list the warning dissapers, so I assume it's related to that module: implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9"

Here's stats I hope help identifying the issue:

  • targetSdkVersion: 30
  • minSdkVersion: 23
  • com.android.tools.build:gradle: 4.0.1
  • Kotlin version: 1.4.10

I'm not sure if this is related to #2046 since the same class is mentioned. That issue is however for ProGuard and mentions other issues too.
dkhalanskyjb added a commit that referenced this issue Sep 29, 2020
@dkhalanskyjb
Fix wrong Proguard rules
87bcae9 
Solves #2046 and
#2266.
@dkhalanskyjb dkhalanskyjb mentioned this issue Sep 29, 2020
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@qwwdfsad
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qwwdfsad commented Sep 30, 2020 •
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We'll add a rule to ignore this warning in 1.4 release

recheej pushed a commit to recheej/kotlinx.coroutines that referenced this issue Dec 28, 2020
@dkhalanskyjb @recheej
Fix wrong Proguard rules (Kotlin#2273)
f2653ac 
Fixes Kotlin#2046 
Fixes Kotlin#2266
recheej pushed a commit to recheej/kotlinx.coroutines that referenced this issue Dec 28, 2020
@dkhalanskyjb @recheej
Fix wrong Proguard rules (Kotlin#2273)
3b8e7c8 
Fixes Kotlin#2046 
Fixes Kotlin#2266
derat added a commit to derat/nup-android that referenced this issue Feb 23, 2021
@derat
Upgrade kotlinx-coroutines deps to 1.4.2.
beb1432 
This seems changes Proguard junk to get rid of some warnings
while building:

  R8: Missing class: java.lang.instrument.ClassFileTransformer
  R8: Missing class: sun.misc.SignalHandler

Kotlin/kotlinx.coroutines#2266

(It may only fix ClassFileTransformer; not sure. I don't
seem to see these every time.)
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@qwwdfsad @Anigif