java.lang.NoClassDefFoundError：JDK 1.7中的java / awt / Desktop

Question

I am trying to use the Gmail API and I encountered this run-time exception:

java.lang.NoClassDefFoundError: java/awt/Desktop

It occurs here (on the last line):

    InputStream stream = ReadMail.class.getResourceAsStream("/client_secret.json");
    Reader clientSecretReader = new InputStreamReader(stream);
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(ReadMail.JSON_FACTORY, clientSecretReader);

    GoogleAuthorizationCodeFlow flow =
            new GoogleAuthorizationCodeFlow.Builder(
                    ReadMail.HTTP_TRANSPORT, ReadMail.JSON_FACTORY, clientSecrets, ReadMail.SCOPES)
                    .setDataStoreFactory(ReadMail.DATA_STORE_FACTORY)
                    .setAccessType("offline")
                    .build();


    AuthorizationCodeInstalledApp authCodeInstalledApp = new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver());
    Credential credential = authCodeInstalledApp.authorize("user");

This code is sitting in the doInBackground() method of AsyncTask .

I have checked and Android Studio is configured to use JDK 1.7.

Why does this happen and how can I fix it?

Answer 1

Android does not support all JDK classes, only a subset and java.awt is not part of it. Therefore java.awt.Desktop cannot be found. It seems like you're not using the right API at all. You should use Android Quickstart instead.