Commercial at (@) is currently forbidden character in node name. Forbidden by Magnolia that is, for historical reasons, see more at https://documentation.magnolia-cms.com/display/DOCS/Managing+pages#Managingpages-Invalidcharacters.

Due to those characters being historically forbidden by Magnolia, there are various parts that do not handle such chars well as it was not required in the past. Said commercial character is however no longer treated consistently and most apps allow it's use as node or property name.

Without changing functionality of Magnolia where commercial is allowed on purpose (user subapp), we need to treat nodes with commercial consistently. Therefore:

• AddNodeAction should validate label name and not create node with invalid name
• SaveRoleDialogAction should create roles with valid node names
• JcrContentConnector should not fail on NPE when node contains @
• remove duplicated code between JcrContentConnector and JcrItemUtil

Once we MGNLUI-322 is resolved, commercial character can be enabled again for all apps, by simply removing it from the validation method and enabling it in all places at once.