Android Studio – Importanto a biblioteca Simple-Xml (Importing Simple-Xml library)

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Warning:Dependency xpp3:xpp3:1.1.3.3 is ignored for debug as it may be conflicting with the internal version provided by Android.
In case of problem, please repackage it with jarjar to change the class packages
Warning:Dependency xpp3:xpp3:1.1.3.3 is ignored for release as it may be conflicting with the internal version provided by Android.
In case of problem, please repackage it with jarjar to change the class packages
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Error:Execution failed for task ‘:app:preDexDebug’.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process ‘command ‘/usr/lib/jvm/java/bin/java” finished with non-zero exit value 1
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java.lang.NoClassDefFoundError: org.simpleframework.xml.core.Persister
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As Libraries stax-api e xpp3 entram em conflito com as classes do Android. As classes destes .jars parecem estar incluídas no Android.
Para solucionar devemos implementar as dependências da seguinte maneira:

compile(‘org.simpleframework:simple-xml:2.7.1′) {
      exclude group: ‘stax’, module: ‘stax-api’
      exclude group: ‘xpp3′, module: ‘xpp3′
}

compile 'com.squareup.retrofit:converter-simplexml:1.9.0' {
    exclude group: 'xpp3', module: 'xpp3'
    exclude group: 'stax', module: 'stax-api'
    exclude group: 'stax', module: 'stax'
}