how to keep the uploaded files in the form until submit it using jsf-2 and primefaces-3.4

Question

I have form with many input fields plus primefaces component to upload multiple file "p:fileUpload" when I submit the form I can't get the uploaded files .. the manged bean is "RequestScoped" . So how can I get the uploaded files without making the manged bean View scope?

the upload method

    public void upload(FileUploadEvent event) {
    try {
        FacesMessage msg = new FacesMessage("Success! ", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
        // Do what you want with the file
        String thumbnail = getDestination() + event.getFile().getFileName();
        int index = thumbnail.lastIndexOf('.');
        SystemFile systemFile = new SystemFile();
        systemFile.setAccount(getActor().getAccount());
        systemFile.setName(event.getFile().getFileName());
        systemFile.setPath(getTalentPath());

        systemFile.setFileType(FileUtil.checkFileType(thumbnail.substring(index + 1)));
        if (systemFiles == null) {
            systemFiles = new ArrayList<>();
        }
        systemFiles.add(systemFile);
        copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
    } catch (IOException ex) {
        SystemLogger.getLogger(getClass().getSimpleName()).error(null, ex);
    }
}

primefaces component

    <p:fileUpload label="#{TalentMessages.lbl_Select_File}" fileUploadListener="#{talentPropertyAction.upload}"
                                  mode="advanced"
                                  multiple="true"
                                  uploadLabel="#{TalentMessages.lbl_upload_File}"
                                  cancelLabel="#{TalentMessages.lbl_cancel_File}"
                                  sizeLimit="2000000"
                                  oncomplete="completeUploadFile(#{talentPropertyAction.talentId});"
                                  />

then the save function

    @Setter
@Getter
private List<SystemFile> systemFiles;
try {
 // save something else then save the files
        if (systemFiles != null) {
            System.out.println("Not Null" + systemFiles);
            for (SystemFile systemFile : systemFiles) {
                TalentPropertyFile talentPropertyFile = new TalentPropertyFile();
                talentPropertyFile.setTalentProperty(talentProperty);
                talentPropertyFile.setFile(systemFile);
                getTalentService().save(getActor().getAccount(), talentPropertyFile);
            }
        } else {
            System.out.println("Null");
        }
    } catch (InvalidParameter ex) {
        SystemLogger.getLogger(getClass().getName()).error(null, ex);
    }

Answer 1

So how can I get the uploaded files without making the manged bean View scope?

Just store the upload information immediately in a more permanent place than as a property of a request scoped bean which get garbaged by end of request-response anyway (note: every upload counts as a separate HTTP request).

public void upload(FileUploadEvent event) {
    // Now, store on disk or in DB immediately. Do not assign to a property.
}

public void save() {
    // Later, during submitting the form, just access them from there.
}

If you need some key to access them, consider storing the key in the session scope.