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我正在尝试让 Google Calendar API 的授权请求正常工作。我似乎获得了一个凭证，一切都很好，但是当我尝试使用它时，我被告知我正在尝试持久化一个已经持久化的对象。

这是授权 servlet 的代码，我在其中授权用户并执行请求（回调被调用一次，后续请求不需要它）。

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    somethingTest();
    response.getOutputStream().println("<html><head><title>Hello</title></head><body><p>Hello world!</p></body></html>");
}

void somethingTest(){
    Event event = new Event();
    event.setSummary("appointment");
    event.setLocation("HQ");
    ArrayList<EventAttendee> attendees = new ArrayList<EventAttendee>();
    attendees.add(new EventAttendee().setEmail(OTHER_ATTENDEE));
    event.setAttendees(attendees);

    DateTime start = DateTime.parseRfc3339("2012-06-05T10:00:00.000+01:00");
    DateTime end = DateTime.parseRfc3339("2012-06-05T11:00:00.000+01:00");
    event.setStart(new EventDateTime().setDateTime(start).setTimeZone("CEST"));
    event.setEnd(new EventDateTime().setDateTime(end).setTimeZone("CEST"));
    event.setRecurrence(Arrays.asList("RRULE:FREQ=WEEKLY;UNTIL=20120801T100000+01:00"));

    Calendar calendar = Calendar.builder(HTTP_TRANSPORT, JSON_FACTORY)
            .setApplicationName("CalendarSyncTest/1.0")
            .setHttpRequestInitializer(getCredential()).build();
    try {
        // NEXT LINE THROWS EXCEPTION
        Event createdEvent = calendar.events().insert("primary", event).execute();
        log.trace("Event created: " + createdEvent.getId());
    } catch (IOException e) {
        log.warn("Exception caught mocking about", e);
    }

}

@Override
protected String getRedirectUri(HttpServletRequest req)
        throws ServletException, IOException {
    log.trace("getRedirectUri()");
    GenericUrl url = new GenericUrl(req.getRequestURL().toString());
    url.setRawPath("/google-sync/Callback");
    return url.build();
}

@Override
protected AuthorizationCodeFlow initializeFlow() throws ServletException,
        IOException {       
    log.trace("InitializeFlow()");


    javax.jdo.PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("transactions-optional");

    return new GoogleAuthorizationCodeFlow.Builder(
            HTTP_TRANSPORT,
            JSON_FACTORY,
            CLIENT_ID, CLIENT_SECRET, 
            Collections.singleton(CalendarScopes.CALENDAR)).setCredentialStore(new JdoCredentialStore(pmf))
            .build();
}

@Override
protected String getUserId(HttpServletRequest req) throws ServletException,
        IOException {
    return USER_EMAIL;
}

当然也有例外：

org.datanucleus.exceptions.NucleusUserException: Object "com.google.api.client.extensions.jdo.auth.oauth2.JdoPersistedCredential@1abf87" being inserted has id [USER_EMAIL HERE] yet an object with this id already exists in the datastore!
org.datanucleus.store.xml.XMLPersistenceHandler.insertObject(XMLPersistenceHandler.java:96)
org.datanucleus.state.JDOStateManager.internalMakePersistent(JDOStateManager.java:2376)
org.datanucleus.state.JDOStateManager.makePersistent(JDOStateManager.java:2352)
org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1840)
org.datanucleus.ObjectManagerImpl.persistObjectWork(ObjectManagerImpl.java:1689)
org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1554)
org.datanucleus.api.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:740)
org.datanucleus.api.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:765)
com.google.api.client.extensions.jdo.auth.oauth2.JdoCredentialStore.store(JdoCredentialStore.java:47)
com.google.api.client.auth.oauth2.CredentialStoreRefreshListener.makePersistent(CredentialStoreRefreshListener.java:62)
com.google.api.client.auth.oauth2.CredentialStoreRefreshListener.onTokenResponse(CredentialStoreRefreshListener.java:48)
com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:497)
com.google.api.client.auth.oauth2.Credential.intercept(Credential.java:255)
com.google.api.client.http.HttpRequest.execute(HttpRequest.java:746)
com.google.api.client.googleapis.json.GoogleJsonResponseException.execute(GoogleJsonResponseException.java:182)
com.google.api.client.googleapis.services.GoogleClient.executeUnparsed(GoogleClient.java:170)
com.google.api.client.http.json.JsonHttpRequest.executeUnparsed(JsonHttpRequest.java:163)
com.google.api.services.calendar.Calendar$Events$Insert.execute(Calendar.java:1810)
com.zylinc.core.googleSync.Test.somethingTest(Test.java:78)
com.zylinc.core.googleSync.Test.doGet(Test.java:56)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
com.google.api.client.extensions.servlet.auth.oauth2.AbstractAuthorizationCodeServlet.service(AbstractAuthorizationCodeServlet.java:129)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

我发现这一切都非常令人困惑，特别是因为 Google 文档是一大堆相互不完全匹配的已弃用方法。

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