- * Gets the user principal from the subject.
- * @param subject Subject.
- * @return User principal.
- * @throws IllegalArgumentException In case there is a duplicate principal or the principal was not found.
+ * Gets the user principal from the subject.
+ *
+ * @param subject
+ * Subject.
+ *
+ * @return User principal.
+ *
+ * @throws IllegalArgumentException
+ * In case there is a duplicate principal or the principal was
+ * not found.