java Lang UnsupportedClassVersion Error in Xamarin Studio

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Unsupported major.minor version 52.0

This error message is caused by an incompatibility with the Java JDK: Android SDK Build-tools versions 24 and higher require Java JDK 8 (1.8), whereas earlier versions were still compatible with Java JDK 7 (1.7). (This resembles older answers about the same error.)

Steps to update:

  1. Update to Java JDK 8. It is recommended to use the 64-bit version for compatibility with the new Xamarin Android designer features in Xamarin Studio 6.1 and Xamarin for Visual Studio 4.2.

  2. Double-check that Java JDK 8 is selected in the Xamarin preferences:

    • Visual Studio: Tools > Options > Xamarin > Android Settings > Java Development Kit Location.

      "Tools > Options > Xamarin > Android Settings > Java Development Kit Location" in Visual Studio

    • Xamarin Studio (on Mac): Xamarin Studio > Preferences > Projects > SDK Locations > Android > Java SDK (JDK).

      "Xamarin Studio > Preferences > Projects > SDK Locations > Android > Java SDK (JDK)"

  3. Install Android SDK Build-tools 24.0.1 or higher.

  4. (Optional) Uninstall the older Android SDK Build-tools 24 that has a bug in aapt:

Alternatives:

If you would rather not update to Java JDK 8 yet, you can instead do one of the following.

  • Uninstall all Android SDK Build-tools versions 24 and higher via the Android SDK manager.

  • Or set the AndroidSdkBuildToolsVersion MSBuild property to an earlier version. For example, if you also have version 23.0.3 installed, you could add the following line within the top <PropertyGroup> element in the Android project .csproj file:

    <AndroidSdkBuildToolsVersion>23.0.3</AndroidSdkBuildToolsVersion>

(See also https://releases.xamarin.com/technical-bulletin-android-sdk-build-tools-24/.)

Additional background info

Update July 25, 2016:

Google has now released Android SDK Build-tools 24.0.1. That version fixes a bug in aapt that was present in version 24.

Update July 14, 2016:

Unsupported major.minor version 52.0

It turns out this error message is caused by an incompatibility with the Java JDK rather than with Xamarin.Android: Android SDK Build-tools version 24 requires Java JDK 1.8, whereas earlier versions were still compatible with Java JDK 1.7. (This resembles older answers about the same error.)

Update June 16, 2016:

The non-preview version of Android SDK Build-tools version 24 is now available in the Android SDK Manager. Xamarin.Android is not yet compatible with that version either.

Info from April 12, 2016:

SDK Build Tools Version: 24 rc2

The “Build Tools Version” looks like it might be the problem. Xamarin.Android is not yet compatible with the “24 rc2” Build-tools version from the “Preview Channel” in the Android SDK Manager. You can uninstall that preview version and install one of the non-preview versions of the Build-tools (such as 23.0.3) using the Android SDK Manager.

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