in struts2-secure-jakarta-stream-multipart-parser-plugin/src/main/java/org/apache/struts/extras/SecureJakartaStreamMultiPartRequest.java [230:235]
public String getParameter(String name) {
List<String> values = parameters.get(name);
if (values != null && values.size() > 0)
return values.get(0);
return null;
}