My code

home.xhtml

<h:form  >
  <h:panelGrid columns="2">
  Name:<h:inputText id="name" value="#{stud.name}" />
  RollNo:<h:inputText id="rollno" value="#{stud.rollNo}" />
                
                
                            
                
<h:outputLabel for="branch">Branch</h:outputLabel>   
 <h:selectOneMenu id="branch" value="#{stud.masterBranch}" >
 <s:selectItems var="branches" value="#{branchList}" noSelectionLabel="[Please Select]" label="#{branches.name}"/>
<s:convertEntity />
<a4j:support event="onchange" reRender="section" focus="section"  />
</h:selectOneMenu>
                                
                                  
                                
<h:outputLabel for="section">Section</h:outputLabel>
 <h:selectOneMenu id="section" value="#{stud.masterSection}" >
                                                 
  <s:selectItems  var="sections" value="#{sectionList}" noSelectionLabel="[Please Select]" label="#{sections.section}"/>
                                                  
                                                 
 <s:convertEntity />
 </h:selectOneMenu>
                        
<h:outputLabel for="session">Session</h:outputLabel>  
 <h:selectOneMenu id="session" value="#{stud.masterSession}" >
 <s:selectItems var="sessions" value="#{sessionList}" noSelectionLabel="[Please Select]" label="#{sessions.acadYear}"/>
 <s:convertEntity />
 </h:selectOneMenu>
 <h:outputLabel for="semester">Semester</h:outputLabel>  
 <h:selectOneMenu id="semester" value="#{stud.masterSemester}"  immediate="true" >
 <s:selectItems var="semesters" value="#{semesterList}" noSelectionLabel="[Please Select]" label="#{semesters.semester}"/>
  <s:convertEntity />
  </h:selectOneMenu>
               
<h:commandButton id="hello" label="Proceed" value="Proceed"    action="/check.xhtml">
<s:conversationPropagation type="begin"/>
</h:commandButton>
</h:panelGrid>
</h:form>

registrationBean.java

@Name("register")
@Scope(ScopeType.CONVERSATION)
public @Stateful class registrationBean implements registration,Serializable {

     
     /**
      * 
      */
     private static final long serialVersionUID = -1096164083206708820L;
     @In     
     private EntityManager entityManager;
     @In(required=false)
     private StudentReg stud;
     
     
     @End
     public String doRegister() {
          
          entityManager.persist(stud);
          return "/home.xhtml";
          
          
     }
     public String confirm()
     {
               
               return "/check.xhtml";
     }

     
     
     @DataModel
     private List<MasterBranch> branchList;
     
     @Factory("branchList")
     public void initBranchList()
     {
          branchList = entityManager.createQuery("select p from MasterBranch p").getResultList();
     }
     
     
     
     
     @DataModel
    private List<MasterSection> sectionList;

    @Factory("sectionList")
    public void initSectionList()
    {
         sectionList = entityManager.createQuery("select p from MasterSection p where p.masterBranch.id=#{stud.masterBranch.id}").getResultList();

    } 
     
     
     @DataModel
     private List<MasterSession> sessionList;
     
     @Factory("sessionList")
     public void initSessionList()
     {
          sessionList = entityManager.createQuery("select p from MasterSession p").getResultList();
     }
     
     @DataModel
     private List<MasterSession> semesterList;
     
     @Factory("semesterList")
     public void initSemesterList()
     {
          semesterList = entityManager.createQuery("select p from MasterSemester p").getResultList();
     }
     @Remove @Destroy
     public void destroy()
     {
     }

     
}

MasterSection.java

@Entity
@Name("masterSection")
@Table(name = "master_section", catalog = "harsh1")
public class MasterSection implements java.io.Serializable {

     /**
      * 
      */
     private static final long serialVersionUID = -1331030075760491783L;
     private Integer sectionId;
     private MasterBranch masterBranch;
     private String section;
     private Set<StudentReg> studentRegs = new HashSet<StudentReg>(0);
     private Set<StudentReg> studentRegs_1 = new HashSet<StudentReg>(0);

     public MasterSection() {
     }

     public MasterSection(MasterBranch masterBranch, String section) {
          this.masterBranch = masterBranch;
          this.section = section;
     }

     public MasterSection(MasterBranch masterBranch, String section,
               Set<StudentReg> studentRegs, Set<StudentReg> studentRegs_1) {
          this.masterBranch = masterBranch;
          this.section = section;
          this.studentRegs = studentRegs;
          this.studentRegs_1 = studentRegs_1;
     }

     @Id
     @GeneratedValue(strategy = IDENTITY)
     @Column(name = "Section_id", unique = true, nullable = false)
     public Integer getSectionId() {
          return this.sectionId;
     }

     public void setSectionId(Integer sectionId) {
          this.sectionId = sectionId;
     }

     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "branch", nullable = false)
     @NotNull
     public MasterBranch getMasterBranch() {
          return this.masterBranch;
     }

     public void setMasterBranch(MasterBranch masterBranch) {
          this.masterBranch = masterBranch;
     }

     @Column(name = "Section", nullable = false, length = 5)
     @NotNull
     @Length(max = 5)
     public String getSection() {
          return this.section;
     }

     public void setSection(String section) {
          this.section = section;
     }

     @OneToMany(fetch = FetchType.LAZY, mappedBy = "masterSection")
     public Set<StudentReg> getStudentRegs() {
          return this.studentRegs;
     }

     public void setStudentRegs(Set<StudentReg> studentRegs) {
          this.studentRegs = studentRegs;
     }

     @OneToMany(fetch = FetchType.LAZY, mappedBy = "masterSection")
     public Set<StudentReg> getStudentRegs_1() {
          return this.studentRegs_1;
     }

     public void setStudentRegs_1(Set<StudentReg> studentRegs_1) {
          this.studentRegs_1 = studentRegs_1;
     }

     @Override
      public boolean equals(Object other) {
       return this.getSectionId().equals(((MasterSection) other).getSectionId());
      }

      /*@BypassInterceptors
      @Override
      public int hashCode() {
           
           return this.getSectionId();
         

      
      }
*/     
}

The problem is coming in stud.masterSection field of the home.xhtml

Please tell me if there is any error in the code

I tried but its not working

Value not valid error is coming...

Please suggest another solution

What should be the correct implementation of the equals and hashcode ?????

Please help me solving this problem