Error:Execution failed for task ':app:transformClassesWithFirebasePerformancePluginForRelease'

Question

I can not find the origin of this error when I compile in release mode. I have the impression that this error appeared without modifying my code (I try to go back with github bu

Answer 1

Reason: When the classpath dependency to perf-plugin is defined in the app-level build.gradle file instead of project-level build.gradle file, perf-plugin (at runtime) get's the ASM v6 dep even though in it's POM file ASM v7 dep is declared. This triggers the IllegalArgumentException in the perf-plugin v1.2.0 and v1.2.1 because they depend on ASM v7 however it works fine for v1.1.5 because it depend on ASM v6.

There are a host of posts here that explain why the classpath of the top level buildscript is intended to be different from the rest of the project:

---

Solution: This is gradle behavior. A quick solution to this is to define the perf-plugin dependency only in the root-project build.gradle (which is already mentioned in the public docs).

---

Detailed Explanation:

NO BUG

root-project build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'
        classpath 'com.google.firebase:perf-plugin:1.2.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

app-level build.gradle

apply plugin: 'com.android.application'
apply plugin: 'com.google.firebase.firebase-perf'


. . .

dependencies {
    implementation 'com.google.firebase:firebase-perf:17.0.2'
}

---

BUG

root-project build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

app-level build.gradle

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.google.firebase:perf-plugin:1.2.1'
    }
}

apply plugin: 'com.android.application'
apply plugin: 'com.google.firebase.firebase-perf'


. . .

dependencies {
    implementation 'com.google.firebase:firebase-perf:17.0.2'
}

---

Comparison of $ ./gradlew clean :buildEnvironment command on both cases shows that all the references to org.ow2.asm:asm:6.0 is converted to org.ow2.asm:asm:7.0 in case of No Bug but that didn't happened in the Bug case:

NO BUG

> Task :buildEnvironment

------------------------------------------------------------
Root project
------------------------------------------------------------

.  .  .

    +--- com.android.tools.build.jetifier:jetifier-processor:1.0.0-beta04
|    |    +--- org.ow2.asm:asm:6.0 -> 7.0
|    |    +--- org.ow2.asm:asm-util:6.0 (*)
|    |    +--- org.ow2.asm:asm-commons:6.0 (*)
|    |    +--- org.jdom:jdom2:2.0.6
|    |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.3.0 -> 1.3.31 (*)
|    |    \--- com.android.tools.build.jetifier:jetifier-core:1.0.0-beta04 (*)
|    +--- com.google.protobuf:protobuf-java:3.4.0
|    \--- com.google.protobuf:protobuf-java-util:3.4.0 (*)
\--- com.google.firebase:perf-plugin:1.2.1
     \--- org.ow2.asm:asm:7.0

BUG

> Task :buildEnvironment

------------------------------------------------------------
Root project
------------------------------------------------------------

.  .  .

     +--- com.android.tools.build.jetifier:jetifier-processor:1.0.0-beta04
     |    +--- org.ow2.asm:asm:6.0
     |    +--- org.ow2.asm:asm-util:6.0 (*)
     |    +--- org.ow2.asm:asm-commons:6.0 (*)
     |    +--- org.jdom:jdom2:2.0.6
     |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.3.0 -> 1.3.31 (*)
     |    \--- com.android.tools.build.jetifier:jetifier-core:1.0.0-beta04 (*)
     +--- com.google.protobuf:protobuf-java:3.4.0
     \--- com.google.protobuf:protobuf-java-util:3.4.0 (*)