Spring @Valid form:checkboxes item must not be null

Im trying to create just basic form with form:checkboxes, @Valid annotation and bindingResult but it returns error although list is not null.. When Im am reading code sysout prints correct size of list, and correct size of checked boxes..

Exception

org.apache.jasper.JasperException: An exception occurred processing JSP page [/WEB-INF/view/home.jsp] at line [24]

21:                 <form:options items="${theCountries}"/>
22:             </form:select><br><br>
23: 
24:     Code language: <form:checkboxes path="languages" items="${programmingLanguages}"/><br>
25:     Operating System: <form:radiobuttons path="operatingSystems" items="${operatingSystems}"/>
26: 
27:     <input type="submit" name="go next">


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:584)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:481)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause

java.lang.IllegalArgumentException: 'items' must not be null
    org.springframework.util.Assert.notNull(Assert.java:115)
    org.springframework.web.servlet.tags.form.AbstractMultiCheckedElementTag.setItems(AbstractMultiCheckedElementTag.java:84)
    org.apache.jsp.WEB_002dINF.view.home_jsp._jspx_meth_form_005fcheckboxes_005f0(home_jsp.java:416)
    org.apache.jsp.WEB_002dINF.view.home_jsp._jspService(home_jsp.java:206)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

To prove that list is not null: app photo link

Here is code:

ReadFromProperties.class

@Component
public class ReadPropertiesImpl implements ReadProperties {

    @Value("#{${student.countrylist}}")
    private HashMap<String,String> countries;

    @Value("#{'${student.languages}'.split(',')}")
    private List<String> languages;

    @Value("#{'${student.operatinsystems}'.split(',')}")
    private List<String> operatingSystems;

    @Override
    public HashMap<String, String> readCountries() {
        return countries;
    }

    @Override
    public List<String> readLanguages() {
        return languages;
    }

    @Override
    public List<String> readOperatingSystems() {
        return operatingSystems;
    }
}

HomeController.class

@Controller
@RequestMapping("/homeController")
public class HomeController {

    @Autowired
    ReadProperties readProperties;


    @GetMapping(value = "/home")
    public String homePage(Model model) {
        model.addAttribute("student", new Student());
        model.addAttribute("theCountries", readProperties.readCountries());
        model.addAttribute("programmingLanguages", readProperties.readLanguages());
        model.addAttribute("operatingSystems", readProperties.readOperatingSystems());
        return "home";
    }

    @GetMapping(value = "processForm")
    public String processForm(@Valid @ModelAttribute("student") Student student, BindingResult bindingResult) {

        if (bindingResult.hasErrors()) {
            System.out.println("has errors");
            return "home";
        } else {
            System.out.println("no errors");
            return "studInfo";
        }
    }
}

Student.class

@Component
public class Student {

    @NotNull(message = "is Required")
    @Pattern(regexp = "/^[a-z ,.'-]+$/i")
    private String fName;

    private String lName;
    private String country;
    private List<String> languages;
    private List<String>  operatingSystems;

    public Student() {
    }

    public String getfName() {
        return fName;
    }

    public void setfName(String fName) {
        this.fName = fName;
    }

    public String getlName() {
        return lName;
    }

    public void setlName(String lName) {
        this.lName = lName;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public List<String> getLanguages() {
        return languages;
    }

    public void setLanguages(List<String> languages) {
        this.languages = languages;
    }

    public List<String> getOperatingSystems() {
        return operatingSystems;
    }

    public void setOperatingSystems(List<String> operatingSystems) {
        this.operatingSystems = operatingSystems;
    }

}

home.jsp:

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form:form action="/homeController/processForm" modelAttribute="student" method="get">
    Enter First Name: <form:input path="fName"/><br>
    <form:errors path="fName"/>

    Enter Last Name" <form:input path="lName"/><br>
    Country: <form:select path="country"><br>
                <form:options items="${theCountries}"/>
            </form:select><br><br>

    Code language: <form:checkboxes path="languages" items="${programmingLanguages}"/><br> //error here :(
    Operating System: <form:radiobuttons path="operatingSystems" items="${operatingSystems}"/><br>

    <input type="submit" name="go next">
</form:form>
</body>
</html>

code source https://github.com/carrothead/SpringMvcJavaConfig.git