src/main/java/org/apache/struts2/fileupload/EnhancedJakartaMultiPartRequest.java [105:187]:
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            upload.setSizeMax(maxSize);
            upload.setProgressListener(progressListener);

            List items = upload.parseRequest(createRequestContext(request));

            for (Object item1 : items) {
                FileItem item = (FileItem) item1;
                if (LOG.isDebugEnabled()) LOG.debug("Found item " + item.getFieldName());
                if (item.isFormField()) {
                    LOG.debug("Item is a normal form field");
                    List<String> values;
                    if (params.get(item.getFieldName()) != null) {
                        values = params.get(item.getFieldName());
                    } else {
                        values = new ArrayList<String>();
                    }

                    // note: see http://jira.opensymphony.com/browse/WW-633
                    // basically, in some cases the charset may be null, so
                    // we're just going to try to "other" method (no idea if this
                    // will work)
                    String charset = request.getCharacterEncoding();
                    if (charset != null) {
                        values.add(item.getString(charset));
                    } else {
                        values.add(item.getString());
                    }
                    params.put(item.getFieldName(), values);
                } else {
                    LOG.debug("Item is a file upload");

                    // Skip file uploads that don't have a file name - meaning that no file was selected.
                    if (item.getName() == null || item.getName().trim().length() < 1) {
                        LOG.debug("No file has been uploaded for the field: " + item.getFieldName());
                        continue;
                    }

                    List<FileItem> values;
                    if (files.get(item.getFieldName()) != null) {
                        values = files.get(item.getFieldName());
                    } else {
                        values = new ArrayList<FileItem>();
                    }

                    values.add(item);
                    files.put(item.getFieldName(), values);
                }
            }
        } catch (FileUploadException e) {
            LOG.warn("Unable to parse request", e);
            errors.add(e.getMessage());
        }
    }

    /**
     * Creates a RequestContext needed by Jakarta Commons Upload.
     * (copy/pasta from JakartaMultiPartRequest)
     *
     * @param req  the request.
     * @return a new request context.
     */
    private RequestContext createRequestContext(final HttpServletRequest req) {
        return new RequestContext() {
            public String getCharacterEncoding() {
                return req.getCharacterEncoding();
            }

            public String getContentType() {
                return req.getContentType();
            }

            public int getContentLength() {
                return req.getContentLength();
            }

            public InputStream getInputStream() throws IOException {
                InputStream in = req.getInputStream();
                if (in == null) {
                    throw new IOException("Missing content in the request");
                }
                return req.getInputStream();
            }
        };
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struts2-fileupload-plugin/src/main/java/org/apache/struts2/fileupload/EnhancedJakartaMultiPartRequest.java [105:187]:
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            upload.setSizeMax(maxSize);
            upload.setProgressListener(progressListener);

            List items = upload.parseRequest(createRequestContext(request));

            for (Object item1 : items) {
                FileItem item = (FileItem) item1;
                if (LOG.isDebugEnabled()) LOG.debug("Found item " + item.getFieldName());
                if (item.isFormField()) {
                    LOG.debug("Item is a normal form field");
                    List<String> values;
                    if (params.get(item.getFieldName()) != null) {
                        values = params.get(item.getFieldName());
                    } else {
                        values = new ArrayList<String>();
                    }

                    // note: see http://jira.opensymphony.com/browse/WW-633
                    // basically, in some cases the charset may be null, so
                    // we're just going to try to "other" method (no idea if this
                    // will work)
                    String charset = request.getCharacterEncoding();
                    if (charset != null) {
                        values.add(item.getString(charset));
                    } else {
                        values.add(item.getString());
                    }
                    params.put(item.getFieldName(), values);
                } else {
                    LOG.debug("Item is a file upload");

                    // Skip file uploads that don't have a file name - meaning that no file was selected.
                    if (item.getName() == null || item.getName().trim().length() < 1) {
                        LOG.debug("No file has been uploaded for the field: " + item.getFieldName());
                        continue;
                    }

                    List<FileItem> values;
                    if (files.get(item.getFieldName()) != null) {
                        values = files.get(item.getFieldName());
                    } else {
                        values = new ArrayList<FileItem>();
                    }

                    values.add(item);
                    files.put(item.getFieldName(), values);
                }
            }
        } catch (FileUploadException e) {
            LOG.warn("Unable to parse request", e);
            errors.add(e.getMessage());
        }
    }

    /**
     * Creates a RequestContext needed by Jakarta Commons Upload.
     * (copy/pasta from JakartaMultiPartRequest)
     *
     * @param req  the request.
     * @return a new request context.
     */
    private RequestContext createRequestContext(final HttpServletRequest req) {
        return new RequestContext() {
            public String getCharacterEncoding() {
                return req.getCharacterEncoding();
            }

            public String getContentType() {
                return req.getContentType();
            }

            public int getContentLength() {
                return req.getContentLength();
            }

            public InputStream getInputStream() throws IOException {
                InputStream in = req.getInputStream();
                if (in == null) {
                    throw new IOException("Missing content in the request");
                }
                return req.getInputStream();
            }
        };
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