Large number of errors during Gradle build after upgrading to Android Studio 2.0

Question

Recently, I upgraded Android Studio from version 1.5 to 2.0 but since then I observe that the number of errors and warnings has increased. Most of the errors do not make sen

Answer 1

Adding -keepattributes EnclosingMethod to proguard rules suppresses these errors and warnings.

Worked for me like a charm.

Update : Adding -keepattributes EnclosingMethod to proguard rules actually changes how the classes are obfuscated. This preserves the optional attributes that are typically necessary for your code to be executed WITHOUT such issue.

Answer 2

Have you tried to clear the project and rebuild ? In the build.gradle file what version on gradle do you have ?

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

Answer 3

The answer should be here NewRelic causing build errors

add in proguard-rules.pro

-keep class         org.apache.commons.beanutils.** { *; }
-keep interface     org.apache.commons.beanutils.** { *; }
-keep enum          org.apache.commons.beanutils.** { *; }

Answer 4

After last update to Android Studio 2.2 beta, I solved problem by updating "buildToolsVersion" to last possible version (from 24 to 24.0.1) in app build.gradle.

Answer 5

You can get rid of the meaningless warnings and errors by deleting the .idea folder that Android Studio 1.5 created and importing the the project into Android Studio 2.0 as a gradle project. It will recreate the .idea folder automatically.

Answer 6

building the Common Collections would produce the required JARs ...

my build.gradle looks about like this, with commons-collections excluded & substituted with a more recent version (one still needs to build from source, just as the message tells one to do):

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    // compile 'commons-collections:commons-collections:3.2.2'
    // compile 'org.apache.commons:commons-collections4:4.1'
    compile ('org.apache.velocity:velocity:1.7') {
        exclude group: 'commons-collections', module: 'commons-collections'
    }
}