I am trying to access the Picasa Web API with the java client using OAuth2
and I am getting a NPE when trying to use the refresh_token to get an
access_token. I went to the OAuth 2.0 Playground and created
an access_token and a refresh_token and everything works fine on the
Playground and I can use the access_token in my java app with the
access_token from the Playground but the refresh token from the playground
does not seem to work. This is the simple code test:
ACCESS_TOKEN test - Works:
Credential credential = new GoogleCredential.Builder()
.setTransport(HTTP_TRANSPORT)
.setJsonFactory(JSON_FACTORY)
.setClientSecrets(CLIENT_ID, CLIENT_SECRET)
.build();
credential.setAccessToken(ACCESS_TOKEN); // ACCESS_TOKEN from the
Playground
REFRESH_TOKEN test - Fails:
Credential credential = new GoogleCredential.Builder()
.setTransport(HTTP_TRANSPORT)
.setJsonFactory(JSON_FACTORY)
.setClientSecrets(CLIENT_ID, CLIENT_SECRET)
.build();
credential.setRefreshToken(REFRESH_TOKEN); // REFRESH_TOKEN from the
Playground
credential.refreshToken(); // <- the exception occurs here
with this stack trace:
Exception in thread "main" java.lang.NullPointerException
at
com.google.api.client.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
at
com.google.api.client.util.Preconditions.checkNotNull(Preconditions.java:127)
at
com.google.api.client.json.jackson2.JacksonFactory.createJsonParser(JacksonFactory.java:92)
at
com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:85)
at
com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:81)
at
com.google.api.client.auth.oauth2.TokenResponseException.from(TokenResponseException.java:88)
at
com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:287)
at
com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:307)
at
com.google.api.client.auth.oauth2.Credential.executeRefreshToken(Credential.java:570)
at
com.google.api.client.googleapis.auth.oauth2.GoogleCredential.executeRefreshToken(GoogleCredential.java:362)
at
com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:489)
at PicasaV2.main(PicasaV2.java:49)
The rest of the code in both cases is a simple test:
PicasawebService myService = new PicasawebService(APP_NAME);
myService.setOAuth2Credentials(credential);
URL feedUrl = new
URL("https://picasaweb.google.com/data/feed/api/user/USEREMAIL?kind=album";);
UserFeed myUserFeed = myService.getFeed(feedUrl, UserFeed.class);
for (AlbumEntry myAlbum : myUserFeed.getAlbumEntries()) {
System.out.println(myAlbum.getTitle().getPlainText());
}
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