in src/main/java/org/apache/sling/repoinit/parser/operations/DisableServiceUser.java [32:38]
public DisableServiceUser(String username, String reason) {
super(username, null);
this.reason = cleanupQuotedString(reason);
if (this.reason == null || this.reason.length() == 0) {
throw new IllegalArgumentException("A non-empty reason is required");
}
}