Returns a GroupPrincipal matching a given name. If a group cannot be found, return null.
null
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session.getUser().checkAdmin(); session.commit(true); Database db = session.getDatabase(); if (roleNames != null) { for (String name : roleNames) { Role grantedRole = db.findRole(name); if (grantedRole == null) { throw DbException.get(ErrorCode.ROLE_NOT_FOUND_1, name); } if (operationType == CommandInterface.GRANT) { grantRole(grantedRole);