java.lang.NullPointerException + jsf + spring

bonsoir
je suis entrain de développer une application jsf spring avec tomcat 7

quand j'execute mon apllication je recu lerreur suivant :

java.lang.NullPointerException
	com.project.formation.bean.StudentBean.addStudent(StudentBean.java:34)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)
	org.apache.el.parser.AstValue.invoke(AstValue.java:278)
	org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:273)
	com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
	javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
	com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
	javax.faces.component.UICommand.broadcast(UICommand.java:315)
	javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
	com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
	com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

mon jsf managed bean est le suivant :

Code:

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@ManagedBean(name="studentBean") 
@Scope(value="session")
@Component
public class StudentBean implements Serializable {
 
	private static final long serialVersionUID = 1L;
	@Autowired
	private  StudentService studentService;
	private Student student;
	private StudentModel studentModel=new StudentModel();
 
	public StudentBean() {
		student = new Student();
	}
 
	public void addStudent() {
		student.setFirstName(studentModel.getFirstName());
		student.setLastName(studentModel.getLastName());
		studentService.add(student);// ligne 34 StudentBean
 
	}
 
	public StudentModel getStudentModel() {
		return studentModel;
	}
 
	public void setStudentModel(StudentModel studentModel) {
		this.studentModel = studentModel;
	}
 
}

Et le code du StudentModel est le suivant :

Code:

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package com.project.formation.web.model;
 
public class StudentModel {
 
 
	private String firstName;
	private String lastName;
	public String getFirstName() {
		return firstName;
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
 
}

aidez moi svp et merci d'avance