Spring MVC Model within POST Method is empty

Question

I´m developing a WebApp with Spring MVC. The Problem is that my model which I pass through with @ModelAttribute, in my POST Method of my Controller seems to be empty, despite I have filled out the form on the web page.

This is the GET Method of my Controller:

@RequestMapping(value = "/CircleUp", method = RequestMethod.GET)
public ModelAndView circleUpGet(Model _model) {
    ModelAndView modelAndView = new ModelAndView("CircleUp");

    CircleUpModel circleUpModel = new CircleUpModel();
    _model.addAttribute("circleUpModel", circleUpModel);

    return modelAndView;
}

This is the POST Method of my Controller:

@RequestMapping(value = "/CircleUp", method = RequestMethod.POST)
public ModelAndView circleUpPost(HttpServletRequest _request, Model _model, @ModelAttribute("circleUpModel") CircleUpModel _circleUpModel) {

    return this.doCircleUp(_request, _model, _circleUpModel);
}

Here the "_circleUpModel" does not have any values.

This is my form in the related .jsp File with the needed script:

<form:form method="post" modelAttribute="circleUpModel" id="circle_form" action="" enctype="multipart/form-data" >


    <form:input path="file" id="upload" type="file" />

    <form:checkbox path="mergeSameTickmarks" checked="true" />

    <form:checkbox path="deleteHighlights" checked="true" />

    <form:checkbox path="generateFigureLog" checked="true" />

    ...

    <input type="button" onclick="javascript:submitForm()"
        value="Start Circle Up">

function submitForm() {
    if (checkIfPdf() && checkSettings()) {
        $("#circle_form").submit()
        setTimeout(progress, 100);
    }
}

Of course the default values of the CircleUpModel are presented but if I enter some other values in the form of the web page this entrys are not considered in the POST Method, despite I added the modelAttribute="circleUpForm" in my form.

CircleUpModel:

import org.pdfclown.files.File;


public class CircleUpModel {

    // File
    private File    file;

    // FileName
    private String  fileName;

    private boolean mergeSameTickmarks;
    private boolean deleteHighlights;
    private boolean generateFigureLog;

    // Settings
    private double  circleBorderWidth;

    private double  customizeCircleUp;
    private double  customizeCircleDown;

    private double  gapLeft;
    private double  gapRight;
    private double  maxGap;

    private boolean tickmarkAlwaysUpperCase;

    public File getFile() {
        return file;
    }

    public void setFile(File file) {
        this.file = file;
    }

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public boolean isMergeSameTickmarks() {
        return mergeSameTickmarks;
    }

    public void setMergeSameTickmarks(boolean mergeSameTickmarks) {
        this.mergeSameTickmarks = mergeSameTickmarks;
    }

    public boolean isDeleteHighlights() {
        return deleteHighlights;
    }

    public void setDeleteHighlights(boolean deleteHighlights) {
        this.deleteHighlights = deleteHighlights;
    }

    public boolean isGenerateFigureLog() {
        return generateFigureLog;
    }

    public void setGenerateFigureLog(boolean generateFigureLog) {
        this.generateFigureLog = generateFigureLog;
    }

    public double getCircleBorderWidth() {
        return circleBorderWidth;
    }

    public void setCircleBorderWidth(double circleBorderWidth) {
        this.circleBorderWidth = circleBorderWidth;
    }

    public double getCustomizeCircleUp() {
        return customizeCircleUp;
    }

    public void setCustomizeCircleUp(double customizeCircleUp) {
        this.customizeCircleUp = customizeCircleUp;
    }

    public double getCustomizeCircleDown() {
        return customizeCircleDown;
    }

    public void setCustomizeCircleDown(double customizeCircleDown) {
        this.customizeCircleDown = customizeCircleDown;
    }

    public boolean isTickmarkAlwaysUpperCase() {
        return tickmarkAlwaysUpperCase;
    }

    public void setTickmarkAlwaysUpperCase(boolean tickmarkAlwaysUpperCase) {
        this.tickmarkAlwaysUpperCase = tickmarkAlwaysUpperCase;
    }

    public double getGapLeft() {
        return gapLeft;
    }

    public void setGapLeft(double gapLeft) {
        this.gapLeft = gapLeft;
    }

    public double getGapRight() {
        return gapRight;
    }

    public void setGapRight(double gapRight) {
        this.gapRight = gapRight;
    }

    public double getMaxGap() {
        return maxGap;
    }

    public void setMaxGap(double maxGap) {
        this.maxGap = maxGap;
    }

}

Answer 1

This problem could be resolved by changing the type of the file in the model.

Previously it was a pdfclown file and now I have changed it into a MultipartFile. In my POST Method I have converted the file from MultipartFile into pdfclown File to be able to work with it like before.