I am displaying a ProductList, which is made up of Product objects. The Product has attributes of type int, string, string, and int. The data is being pulled from the database and I build a ProductList. The data is in the database, I can see it, but when I display the table, the table shows 0's for the 2 int columns, and blanks in the String columns. Here is the ProductList:
#ManagedBean
public class ProductList {
private ArrayList<Product> allProducts;
public ProductList(){
allProducts = DatabaseConnector.getAllProducts();
}
public ArrayList<Product> getAllProducts(){
return allProducts;
}
public void setAllProducts(ArrayList<Product> allProducts){
this.allProducts = allProducts;
}
}
And here is the Product bean:
#ManagedBean
public class Product {
private int id;
private String productName;
private String description;
private int quantity;
public Product() {
}
public void setId(int id) {
this.id = id;
}
public void setProductName(String productName) {
this.productName = productName;
}
public void setDescription(String description) {
this.description = description;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public int getId() {
return id;
}
public String getProductName() {
return productName;
}
public String getDescription() {
return description;
}
public int getQuantity() {
return quantity;
}
}
Should I change the scope of the beans?
Add scope annotation to your bean , for example #RequestScoped or #ViewScoped
otherwise it will be the default scope which is #NoneScoped
Related
Hi I am trying to convert an xml file into Java Objects using JAXB and I am very new to java. I have created the pojo classes and added some annotations but I am not sure whether they are right? I have spent hours in google but couldn't find what is wrong.
This is my xml :
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<question id="1">
<answers>
<answername>java is a programming language</answername>
<id>101</id>
<postedby>ravi</postedby>
</answers>
<answers>
<answername>java is a platform</answername>
<id>102</id>
<postedby>john</postedby>
</answers>
<questionname>What is java?</questionname>
<marks set=50>
<longAnswer set=45/>
<shortAnswer set=30/>
</marks>
</question>
Pojo classes:
#XmlRootElement(name="question")
public class Question {
private int id;
private String questionname;
private List<Answer> answers;
private List<Marks> marks;
public Question() {}
public Question(int id, String questionname, List<Answer> answers, List<Marks> marks) {
super();
this.id = id;
this.questionname = questionname;
this.answers = answers;
this.marks = marks;
}
#XmlElement(name="marks")
public List<Marks> getMarks() {
return marks;
}
public void setMarks(List<Marks> marks) {
this.marks = marks;
}
#XmlAttribute
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
#XmlElement
public String getQuestionname() {
return questionname;
}
public void setQuestionname(String questionname) {
this.questionname = questionname;
}
#XmlElement
public List<Answer> getAnswers() {
return answers;
}
public void setAnswers(List<Answer> answers) {
this.answers = answers;
}
}
public class Answer {
private int id;
private String answername;
private String postedby;
public Answer() {}
public Answer(int id, String answername, String postedby) {
super();
this.id = id;
this.answername = answername;
this.postedby = postedby;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAnswername() {
return answername;
}
public void setAnswername(String answername) {
this.answername = answername;
}
public String getPostedby() {
return postedby;
}
public void setPostedby(String postedby) {
this.postedby = postedby;
}
}
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
public class Marks {
private LongAnswer longAnswer ;
private ShortAnswer shortAnswer;
private String set;
#XmlAttribute
public String getSet() {
return set;
}
public void setSet(String set) {
this.set = set;
}
#XmlElement(name="longAnswer")
public LongAnswer getLongAnswer() {
return longAnswer;
}
public void setLongAnswer(LongAnswer longAnswer) {
this.longAnswer = longAnswer;
}
#XmlElement(name="shortAnswer")
public ShortAnswer getShortAnswer() {
return shortAnswer;
}
public void setShortAnswer(ShortAnswer shortAnswer) {
this.shortAnswer = shortAnswer;
}
}
public class LongAnswer {
private String set;
public String getSet() {
return set;
}
public void setSet(String set) {
this.set = set;
}
public class ShortAnswer {
private String set;
public String getSet() {
return set;
}
public void setSet(String set) {
this.set = set;
}
}
Can anyone tell me how to annotate the 'marks' model class and how to set 'longAnswer' and 'shortAnswer' field. Because i am getting null values for them.
You should annotate your set properties with #XmlAttribute. Otherwise it looks quite fine.
What you could also do is create an XML Schema for you XML and compile it.
I managed to create very simple example of sending Object between JSF pages:
First page:
#Named
#ViewScoped
public class Pricing
{
public Pricing()
{
int ww = 3;
PricingFormData obj = new PricingFormData(334, "Lalalala");
FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put("yourKey", obj);
}
Second page:
#Named
#ViewScoped
public class PricingCalculator implements Serializable
{
PricingFormData get;
public PricingCalculator()
{
get = (PricingFormData) FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("yourKey");
}
}
Custom Object:
public class PricingFormData
{
private int id;
private String name;
public PricingFormData(int id, String name)
{
this.id = id;
this.name = name;
}
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
}
This code works but I have several questions which I want to ask:
The code is working in View scope. What will happen if multiple users are clicking on the pages? Are these Objects are going to be mixed? Do I need to use some unique ID for Object key for example session ID. But here I don't have session.
What will happen if the Objects are too many(multiple users are working on the web site)? When the objects will be disposed?
I'm trying to use spring-data-cassandra (1.1.2.RELEASE) and I'm running into an issue with the lack of embeddable type mapping in JPA parlance.
I have an entity class like this:
#Table
public class Customer {
private UUID id;
private String name;
private Address address;
public UUID getId() {
return id;
}
public void setId(UUID id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
and the embeddable Address class:
public class Address {
private String address;
private String city;
private String state;
private String zip;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
}
My cassandra table:
create table customer (
id uuid primary key,
name text,
address text,
city text,
state text,
zip text
);
I want the properties of Address to be mapped into the containing entity, I don't want a separate table for addresses. In JPA, I believe I'd use an #Embeddable annotation. Is there some similar construct in spring-data-cassandra?
Embeddable types are not yet supported by spring-data-cassandra. A feature request is available at DATACASS-167.
The only possible part of an entity to embed is the primary key. If your primary key consists of multiple fields, you can externalize that fields into a separate class and use it afterwards with the #PrimaryKey annotation.
Comment.java
#Table("comments")
public class Comment {
#PrimaryKey
private CommentKey pk;
private String text;
}
CommentKey.java
#PrimaryKeyClass
public class CommentKey implements Serializable {
private static final long serialVersionUID = -7871651389236401141L;
#PrimaryKeyColumn(ordinal = 0, type = PrimaryKeyType.PARTITIONED)
private String author;
#PrimaryKeyColumn(ordinal = 1)
private String company;
}
HTH, Mark
Here's my XHTML code:
<h:selectOneMenu id="combo" value="#{TeamsHinzufuegenBean.selectedLeagueId}">
<f:selectItems value="#{TeamsHinzufuegenBean.leagues}"
var="league" itemValue="#{league.id}"
itemLabel="#{league.name}"/>
</h:selectOneMenu>
And my bean:
#ManagedBean(name = "TeamsHinzufuegenBean")
#ViewScoped
public class TeamsHinzufügenBean implements Serializable{
private static final long serialVersionUID = 1L;
private List<League> leagues;
private ArrayList<Team> teams = new ArrayList<Team>();
private String teamname;
private int selectedLeagueId=1;
#PostConstruct
public void init() {
leagues = Database.getInstance().getAllLeagues();
for(League l : leagues)
System.out.println(l);
}
public List<League> getLeagues() {
return leagues;
}
public void setLeagues(List<League> leagues) {
this.leagues = leagues;
}
public int getSelectedLeagueId() {
return selectedLeagueId;
}
public void setSelectedLeagueId(int selectedLeagueId) {
this.selectedLeagueId = selectedLeagueId;
}
public ArrayList<Team> getTeams() {
return teams;
}
public void setTeams(ArrayList<Team> teams) {
this.teams = teams;
}
public String getTeamname() {
return teamname;
}
public void setTeamname(String teamname) {
this.teamname = teamname;
}
}
The league-class has an attribute id but if I output the value of selectedLeagueId, it is always 0.
Check if getAllLeagues() contains objects that have an id and that it is correctly set
take a look at this code :
#XmlRootElement
class Course {
private int id;
private String name;
public Course() {}
public Course(int id, String name) {
super();
this.id = id;
this.name = name;
}
#XmlAttribute(name = "id")
public int getId() {
return id;
}
#XmlAttribute(name = "name")
public String getName() {
return name;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
}
class CourseAdapter extends XmlAdapter<Integer, Course>{
#Override
public Course unmarshal(Integer v) throws Exception {
// what to do hereeeeeeeeeeeeeeee????!!!!
// I want the Course with the id = v unmarshalled from
// the same xml I am unmarshalling at the moment
}
#Override
public Integer marshal(Course v) throws Exception {
return v.getId();
}
}
#XmlRootElement
class Offering {
private int id;
private Course course;
private int capacity;
public Offering() {}
public Offering(int id, Course course, int capacity) {
super();
this.id = id;
this.course = course;
this.capacity = capacity;
}
#XmlAttribute(name = "id")
public int getId() {
return id;
}
#XmlJavaTypeAdapter(CourseAdapter.class)
#XmlAttribute(name = "course")
public Course getCourse() {
return course;
}
#XmlAttribute(name = "capacity")
public int getCapacity() {
return capacity;
}
public void setId(int id) {
this.id = id;
}
public void setCourse(Course course) {
this.course = course;
}
public void setCapacity(int capacity) {
this.capacity = capacity;
}
}
#XmlRootElement
class Department {
private String name;
private ArrayList<Course> courses;
private ArrayList<Offering> offerings;
public Department(){}
public Department(String name, ArrayList<Course> courses, ArrayList<Offering> offerings) {
super();
this.name = name;
this.courses = courses;
this.offerings = offerings;
}
#XmlAttribute(name = "name")
public String getName() {
return name;
}
#XmlElement
public ArrayList<Course> getCourses() {
return courses;
}
#XmlElement
public ArrayList<Offering> getOfferings() {
return offerings;
}
public void setName(String name) {
this.name = name;
}
public void setCourses(ArrayList<Course> courses) {
this.courses = courses;
}
public void setOfferings(ArrayList<Offering> offerings) {
this.offerings = offerings;
}
}
I have marshalled my Department and this is the result:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<department name="ece">
<courses id="1" name="farsi"/>
<courses id="2" name="dini"/>
<courses id="2" name="riazi"/>
<offerings capacity="10" course="1" id="1"/>
<offerings capacity="20" course="2" id="2"/>
</department>
the problem is I do not know how to unmarshal course with the id = v from this very xml which is being unmarshalled via "unmarshal" function of CourseAdapter .
You can use #XmlID/#XmlIDREF for this use case without requiring an XmlAdapter.
http://blog.bdoughan.com/2010/10/jaxb-and-shared-references-xmlid-and.html