0 Replies Latest reply on Mar 8, 2018 6:08 AM by Thomas Jones

    Android Zebra SDK - Dex Failure because of Gson

    Thomas Jones


      I'm currently working with an app that was using the Android Zebra SDK and would like to update to the latest ( However, I now get a build error, showing a failure in the dexing of the apk:

      * What went wrong:

      Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.

      > java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

      I've tracked this down to the fact that my project includes the Gson library, version 2.8.1. I opened the contents of the ZebraSDK AAR and see that Gson 2.2.4 is being bundled in the libs folder. I suspect this is overriding the version of Gson I'm specifying in my gradle file due to a particular feature of the newer version now resulting in a compile error when including in the new Zebra SDK :

      > Task :app:compileDebugJavaWithJavac

      /.../ZebraTest/app/src/main/java/com/sample/zebratest/JsonModel.java:9: error: cannot find symbol

          @SerializedName(value="name1", alternate={"name_1"})

      As you see here, the 'alternate' attribute of the SerializeName annotation is no longer available. Ordinarily if the SDK was a Maven dependency, one could simply add exclusions for the particular module and the version specified in the gradle file would take precedence, such as :

      implementation('com.zebra.scannercontrol:barcode_scanner_library_v2.2.4.0@aar', {

        exclude group: 'com.google.code', module: 'gson'

      However, I don't think it's possible to add exclusions on local file dependencies.


      So far I've tried a few things:

      1) Created a module from the AAR and attempted to exclude with library syntax, but it resulted in the same errors:

      implementation (project(":barcode_scanner_library"), {

        exclude group: 'com.google.code', module: 'gson'


      2) I've created a new version of the .aar by unzipping the existing aar and removing the gson jar file, and zipping it back up, but this also did not work - the app now fails to find any of the dependencies specified of the SDK, perhaps I've created the aar incorrectly.


      I'm at a loss as to what to do next. Does anyone use the Zebra SDK with newer versions of Gson successfully? Any help is appreciated.