dúvida jsf2

package entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Bug {

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name="id", nullable=false, columnDefinition="integer")
	private Long id;

	private String description;

	private String severity;

	@ManyToOne
	private Project project;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getSeverity() {
		return severity;
	}

	public void setSeverity(String severity) {
		this.severity = severity;
	}

	public Project getProject() {
		return project;
	}

	public void setProject(Project project) {
		this.project = project;
	}

	@Override
	public int hashCode() {
		return this.description.length() * 23;
	}

	@Override
	public String toString() {
		return description;
	}

	@Override
	public boolean equals(Object obj) {
		if ((obj instanceof Bug)
				&& (((Bug) obj).getDescription().equals(this.description))) {
			return true;
		} else {
			return false;
		}
	}

}

package entities;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Project {

	@Id
	@GeneratedValue
	@Column(name="id", nullable=false, columnDefinition="integer")
	private Long id;

	private String name;

	private String description;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	@Override
	public int hashCode() {
		return this.name.length() * 23;
	}

	@Override
	public String toString() {
		return name;
	}

	@Override
	public boolean equals(Object obj) {
		if ((obj instanceof Project)
				&& (((Project) obj).getName().equals(this.name))) {
			return true;
		} else {
			return false;
		}
	}
}

package managedbeans;

import java.io.Serializable;
import java.util.List;

import javax.enterprise.inject.Model;
import javax.faces.bean.RequestScoped;
import javax.inject.Inject;

import sessionbeans.BugRepository;
import sessionbeans.ProjectRepository;
import entities.Bug;
import entities.Project;

@Model
@RequestScoped
public class BugMB implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = -1339958063986622041L;
	@Inject
	private BugRepository bugRepository;
	@Inject
	private ProjectRepository projectRepository;
	private Bug bug = new Bug();
	private Long projectId;
	private List<Bug> bugs;

	public void save() {
		Project project = this.projectRepository.findById(this.projectId);
		this.bug.setProject(project);

		if (this.getBug().getId() == null) {
			this.bugRepository.add(this.getBug());
		} else {
			this.bugRepository.edit(this.getBug());
		}
		this.bug = new Bug();
		this.bugs = null;
	}

	public void delete(Long id) {
		this.bugRepository.removeById(id);
		this.bug = null;
	}

	public void prepareEdit(Long id) {
		this.bug = this.bugRepository.findById(id);
	}

	public Bug getBug() {
		return bug;
	}

	public List<Bug> getBugs() {
		if (this.bugs == null) {
			this.bugs = this.bugRepository.findAll();
		}
		return bugs;
	}

	public void setProjectId(Long projectId) {
		this.projectId = projectId;
	}

	public Long getProjectId() {
		return projectId;
	}

	public BugRepository getBugRepository() {
		return bugRepository;
	}

	public void setBugRepository(BugRepository bugRepository) {
		this.bugRepository = bugRepository;
	}

	public ProjectRepository getProjectRepository() {
		return projectRepository;
	}

	public void setProjectRepository(ProjectRepository projectRepository) {
		this.projectRepository = projectRepository;
	}

	public void setBug(Bug bug) {
		this.bug = bug;
	}

	public void setBugs(List<Bug> bugs) {
		this.bugs = bugs;
	}

}

package managedbeans;

import java.io.Serializable;
import java.util.List;

import javax.enterprise.inject.Model;
import javax.faces.bean.RequestScoped;
import javax.inject.Inject;

import sessionbeans.ProjectRepository;
import entities.Project;

@SuppressWarnings("serial")
@Model
@RequestScoped
public class ProjectMB implements Serializable {
	@Inject
	private ProjectRepository projectRepository;

	private Project project = new Project();

	private List<Project> projects;

	public void save() {
		if (this.getProject().getId() == null) {
			this.projectRepository.add(this.getProject());
		} else {
			this.projectRepository.edit(this.getProject());
		}
		this.project = new Project();
		this.projects = null;
	}

	public void delete(Long id) {
		this.projectRepository.removeById(id);
		this.projects = null;
	}

	public void prepareEdit(Long id) {
		this.project = this.projectRepository.findById(id);
	}

	public ProjectRepository getProjectRepository() {
		return projectRepository;
	}

	public void setProjectRepository(ProjectRepository projectRepository) {
		this.projectRepository = projectRepository;
	}

	public Project getProject() {
		return project;
	}

	public void setProject(Project project) {
		this.project = project;
	}

	public List<Project> getProjects() {
		if (this.projects == null) {
			this.projects = this.projectRepository.findAll();
		}
		// List<Project> projects = new ArrayList<Project>();
		return projects;
	}

	public void setProjects(List<Project> projects) {
		this.projects = projects;
	}
}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core">

<h:head>
	<title>Bugs</title>
</h:head>

<h:body>
	<ui:include src="/menu.xhtml" />

	<hr />

	<h1>New Bug</h1>
	<h:form>
		<h:panelGrid>
			<h:inputHidden value="#{bugMB.bug.id}" />

			<h:outputLabel value="Severity:" />
			<h:selectOneMenu value="#{bugMB.bug.severity}">
				<f:selectItem itemValue="LOW" />
				<f:selectItem itemValue="MEDIUM" />
				<f:selectItem itemValue="HIGH" />
			</h:selectOneMenu>


			<h:outputLabel for="description" value="Description:" />
			<h:inputTextarea id="description" value="#{bugMB.bug.description}" />

			<h:outputLabel for="selecaoProjeto" value="Project:" />
			
			<h:selectOneMenu id="selecaoProjeto" value="#{bugMB.projectRepository}">			
				<f:selectItems value="#{projectMB.projects}" var="project"
					itemLabel="#{project.description}" itemValue="#{project}"/>
			</h:selectOneMenu>

			<h:commandButton action="#{bugMB.save}" value="Save" />
		</h:panelGrid>
	</h:form>

	<hr />

	<h1>Bug List</h1>
	<h:dataTable value="#{bugMB.bugs}" var="bug"
		rendered="#{not empty bugMB.bugs}" border="1">
		<h:column>
			<f:facet name="header">Id</f:facet>
 #{bug.id}
 </h:column>

		<h:column>
			<f:facet name="header">Project</f:facet>
 #{bug.project.name}
 </h:column>

		<h:column>
			<f:facet name="header">Severity</f:facet>
 #{bug.severity}
 </h:column>

		<h:column>
			<f:facet name="header">Description</f:facet>
 #{bug.description}
 </h:column>

		<h:column>
			<f:facet name="header">Delete</f:facet>
			<h:form>
				<h:commandLink action="#{bugMB.delete(bug.id)}">delete</h:commandLink>
			</h:form>
		</h:column>
		<h:column>
			<f:facet name="header">Edit</f:facet>
			<h:form>
				<h:commandLink action="#{bugMB.prepareEdit(bug.id)}">edit</h:commandLink>
			</h:form>
		</h:column>
	</h:dataTable>
</h:body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core">

<h:head>
	<title>Projects</title>
</h:head>

<h:body>
	<ui:include src="/menu.xhtml" />

	<hr />

	<h1>New Project</h1>
	<h:form id="form">
		<h:panelGrid id="grid">
			<h:inputHidden value="#{projectMB.project.id}" />

			<h:outputLabel for="input1" value="Name:" />
			<h:inputText id="input1" value="#{projectMB.project.name}" />

			<h:outputLabel for="input2" value="Description:" />
			<h:inputTextarea id="input2" value="#{projectMB.project.description}" />

			<h:commandButton action="#{projectMB.save}" value="Save" />
		</h:panelGrid>
	</h:form>

	<hr />
	

	<h1>Project List</h1>
	<h:dataTable id="dataTable" value="#{projectMB.projects}" var="project"
		rendered="#{not empty projectMB.projects}" border="1">
		<h:column>
			<f:facet name="header">Id</f:facet>
 #{project.id}
 </h:column>

		<h:column>
			<f:facet name="header">Name</f:facet>
 #{project.name}
 </h:column>

		<h:column>
			<f:facet name="header">Description</f:facet>
 #{project.description}
 </h:column>

		<h:column>
			<f:facet name="header">Delete</f:facet>
			<h:form>
				<h:commandLink action="#{projectMB.delete(project.id)}">delete</h:commandLink>
			</h:form>
		</h:column>
		<h:column>
			<f:facet name="header">Edit</f:facet>
			<h:form>
				<h:commandLink action="#{projectMB.prepareEdit(project.id)}">edit</h:commandLink>
			</h:form>
		</h:column>
	</h:dataTable>
</h:body>
</html>