the files that are used for the default theme (css and image files) are saved in the database as blob under JIFILERESOURCE table. If you have not used the buildomatic to generate you database schema and initial data this blob data is not created. That is why you are getting the exception. Check JIFILERESOURCE table and make sure that you have the Data column is not null. If the values are null Run js-ant create-load-js-db-pro from the buildomatic directory to create your schema