Create AssetCategory with AssetCategoryLocalServiceUtil - nullpointerexception

Question

I am trying to create AssetCategory using the method addCategory of AssetCategoryLocalServiceUtil. However, I am not aware of what I should specify as ServiceContext. Unlike the other add-methods of LocalServiceUtil classes (Group, Organizations), I deduce that I cannot set the ServiceContext to null. I have tried and I receive a NullPointerExeption when calling the method. If I try to create one, just to pass it in the method, I receive an AssetCategoryNameException. I create it as:
ServiceContext serviceContext = new ServiceContext();
serviceContext.setScopeGroupId(180);
How can I come over the above problem (create the AssetCategory without exception)?
UPDATE: I need also to specify a vocabularyId. How can I get a Vocabulary (or a list of Vocabularies) to be able to get its id? I tried the code:
List<AssetVocabulary> vl = AssetVocabularyUtil.findAll();.
int VocabId = vl.get(0).getVocabularyId();
but it throws the exception:
org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here
What could I do to get the VocabularyId?

Answer 1

Check this code out, I hope it can help you:
// you can particularise your serviceContext as #Jonas Fonseca says
ServiceContext serviceContext = new ServiceContext();
Map<Locale,String> titleMap = new HashMap<Locale, String>();
titleMap.put(Locale.getDefault(), "categoryName");
// vocabularyID needs to point to an existing vocabulary
AssetCategoryLocalServiceUtil.addCategory(userId, parentCategoryId, titleMap, new HashMap<Locale,String>(), vocabularyID, new String[]{}, serviceContext);
Of course is the simplest example about how to create an AssetCategory, but it works fine.
UPDATE:
If you need the vocabulary you can something like:
// in case you have vocabulary id
AssetVocabularyLocalServiceUtil.getVocabulary(vocabularyId);
// in case you have the vocabulary name
AssetVocabularyLocalServiceUtil.getGroupVocabulary(groupId, vocabularyName);
// you can get all vocabularies in group
AssetVocabularyLocalServiceUtil.getGroupVocabularies(groupId);
// ...or all vocabularies in portal
int count = AssetVocabularyLocalServiceUtil.getAssetVocabulariesCount();
AssetVocabularyLocalServiceUtil.getAssetVocabularies(0, count);
(Remember to call *LocalServiceUtil methods instead *Util so you can avoid the Hibernate exception)

Answer 2

If you are getting AssetCategoryNameExceptionit means that the name is invalid, for example null.
What information you need to set in ServiceContextdepends on the service you call. As a minimum you should set the userId (which will be set as the owner), the groupId of the site and the companyId. In addition, should also set the permission properties, which control who can view asset category, especially if the category will be used in conjunction with the asset publisher, which can filter content based on view permissions.
ServiceContext createServiceContext(ThemeDisplay themeDisplay) {
ServiceContext serviceContext = new ServiceContext();
serviceContext.setCompanyId(themeDisplay.getCompanyId());
serviceContext.setScopeGroupId(themeDisplay.getScopeGroupId());
serviceContext.setUserId(themeDisplay.getUserId());
serviceContext.setAddCommunityPermissions(true);
serviceContext.setAddGuestPermissions(true);
return serviceContext;
}