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

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'
    }
}