java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema

[Mattias Cibien (mattiascibien)]

When running maui-check on windows with the Microsoft build of OpenJDK I get the following error when trying to create an emulator:

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
        at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
        at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
        at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
        at com.android.sdklib.tool.AvdManagerCli.run(AvdManagerCli.java:213)
        at com.android.sdklib.tool.AvdManagerCli.main(AvdManagerCli.java:200)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
        ... 5 more

I tried various fixes found online but none of them seems to work.

[Martijn Verburg (karianna)]

Mattias Cibien (@mattiascibien) Does this project work on Java 8 but not Java 11? Are you able to also try with a build from AdoptOpenJDK.net?

We ask because this looks like the typical challenge when upgrading from Java 8 to 11 (where the JAXB implementation was removed from the JDK and you need to reference it via a 3rd party library instead. See https://docs.microsoft.com/en-us/azure/developer/java/fundamentals/transition-from-java-8-to-java-11.

[Bruno Borges (brunoborges)]

Okz seems like you are developing a Xamarin/MAUI application with Visual Studio, and targeting Android.

For this scenario, we suggest you to install the JDK recommended by the Xamarin/MAUI documentation.

As far as I know, Android does not support Java 11 - which is the version of the MS Build of OpenJDK.

[Mattias Cibien (mattiascibien)]

Thanks for your support. I am going to open an issue to the developer of maui-check

[Mattias Cibien (mattiascibien)]

Bruno Borges (@brunoborges) according to https://github.com/dotnet/net6-mobile-samples/blob/17b732a672926fb22f06739f0679a9b68d170810/README.md#android Microsoft OpenJDK 11 is the recommended version for using MAUI. Am I missing something?

[Bruno Borges (brunoborges)]

This is an issue with how MAUI sets the JDK and the required libraries in its classpath. OpenJDK 11 (all vendors, not only Microsoft's) no longer ships an XML parser.

Please do create an issue with the net6-mobile project.

[Bruno Borges (brunoborges)]

Mattias Cibien (@mattiascibien) let us know once you submit the issue to the net6-mobile project. A link to the issue will be appreciated!