The getApplicationId method has to return a content handler identifier. This can be any string that consists of letters, digits, underscore and dash, with a maximum length of 40 characters. Other characters are not allowed. As a convention the name of the folder where the content handler is installed should be used as identifier. In our example we follow the convention and return the applicationId field which has been set in the initialize method:
    public String getApplicationId()
        return applicationId;