The map in my form is not being passed to the controller

beatot23 · Aug 22, 2014

Hi, I'm a newbie in JAVAEE. The data inputted in the map(from the form toevoegen.jsp) is lost(not passed) to the controller.
Please help. Thanks.

I am getting this error:
[highlight #F57900][highlight #F57900]aug 22, 2014 1:37:57 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [springDispatcher] in context with path [/CocktailBarApp] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at be.intecbrussel.web.CocktailsController.cocktailToegevoegd(CocktailsController.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)[/highlight][/highlight]

Code:

package be.intecbrussel.entities;

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

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;


@Entity
@Table(name = "cocktails")
@NamedQueries({
		@NamedQuery(name = "Cocktails.findAll", query = "SELECT c FROM Cocktail c"),
		@NamedQuery(name = "Cocktails.findByNaam", query = "SELECT c FROM Cocktail c WHERE c.naam = :naam") })
public class Cocktail implements Serializable {
	private static final long serialVersionUID = 1L;
	@Id
	@Column(name = "id")
	@GeneratedValue
	private long id;

	@Column(name = "naam")
	private String naam;

	@Column(name = "prijs")
	private BigDecimal prijs;
	
	@OneToMany(mappedBy="cocktail", cascade=CascadeType.ALL)
	private List<Samenstelling> samenstellingList;
	
	public List<Samenstelling> getSamenstellingList() {
		return samenstellingList;
	}

	public void setSamenstellingList(List<Samenstelling> samenstellingList) {
		this.samenstellingList = samenstellingList;
	}

	public Cocktail() {
	}

	public Cocktail(long id) {
		this.id = id;
	}

	public Cocktail(long id, String naam, BigDecimal prijs){ 
		this(naam, prijs);
		this.id = id;
	}

	public Cocktail(String naam, BigDecimal prijs) {
		this.naam = naam;
		this.prijs = prijs;
	}

	public long getId() {
		return id;
	}

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

	public String getNaam() {
		return naam;
	}

	public void setNaam(String naam) {
		this.naam = naam;
	}

	public BigDecimal getPrijs() {
		return prijs;
	}

	public void setPrijs(BigDecimal prijs) {
		this.prijs = prijs;
	}

	@Override
	public String toString() {
		return "be.intecbrussel.entities.Cocktail[ id=" + id + " ]";
	}

	@Override
	public int hashCode() {
		int hash = 3;
		hash = 37 * hash + (int) (this.id ^ (this.id >>> 32));
		return hash;
	}

	@Override
	public boolean equals(Object object) {
		if (!(object instanceof Cocktail)) {
			return false;
		}
		Cocktail other = (Cocktail) object;
		if (this.id == (other.id)) {
			return false;
		}
		return true;
	}

}

Code:

package be.intecbrussel.entities;

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

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name = "samenstellingen")
@NamedQueries({
		@NamedQuery(name = "Samenstellingen.findAll", query = "SELECT s FROM Samenstelling s")})
public class Samenstelling implements Serializable {
	private static final long serialVersionUID = 1L;
	@Id
//	@Column(name = "cocktailid")
	@ManyToOne(cascade=CascadeType.ALL)
	@JoinColumn(name="cocktailid")
	private Cocktail cocktail;

	@Id
	@OneToOne(cascade=CascadeType.ALL)
	@JoinColumn(name="ingredientid")
	private Ingredient ingredient;
	
	@Column(name = "hoeveelheid")
	private long hoeveelheid;

	public Samenstelling() {
	}

	public Samenstelling(Cocktail cocktail, Ingredient ingredient, long hoveelheid) {
		this.cocktail = cocktail;
		this.ingredient = ingredient;
		this.hoeveelheid = hoeveelheid;
	}

	public Cocktail getCocktail() {
		return cocktail;
	}

	public void setCocktail(Cocktail cocktail) {
		this.cocktail = cocktail;
	}

	public Ingredient getIngredient() {
		return ingredient;
	}

	public void setIngredient(Ingredient ingredient) {
		this.ingredient = ingredient;
	}

	public static long getSerialversionuid() {
		return serialVersionUID;
	}

	public long getHoeveelheid() {
		return hoeveelheid;
	}

	public void setHoeveelheid(long hoeveelheid) {
		this.hoeveelheid = hoeveelheid;
	}

}

Code:

package be.intecbrussel.entities;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;

public class Wrapper implements Serializable {
	private static final long serialVersionUID = 1L;
	
	private Cocktail cocktail;
	private Map<Ingredient, BigDecimal> ingredientMap = new HashMap<Ingredient, BigDecimal>();
	
	public Wrapper()
	{
	}

	public Wrapper(Cocktail cocktail, Map<Ingredient, BigDecimal> ingredientMap)
	{
		this.cocktail = cocktail;
		this.ingredientMap = ingredientMap;
	}

	public Cocktail getCocktail() {
		return cocktail;
	}

	public void setCocktail(Cocktail cocktail) {
		this.cocktail = cocktail;
	}

	
	public Map<Ingredient, BigDecimal> getIngredientMap() {
		return ingredientMap;
	}

	public void setIngredientMap(Map<Ingredient, BigDecimal> ingredientMap) {
		this.ingredientMap = ingredientMap;
	}

	public static long getSerialversionuid() {
		return serialVersionUID;
	}
}

Code:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="[URL unfurl="true"]http://java.sun.com/jsp/jstl/core"%>[/URL]
<%@taglib prefix="form" uri="[URL unfurl="true"]http://www.springframework.org/tags/form"%>[/URL] 

<c:set var="contextPath"
	value="${pageContext.servletContext.contextPath}" />
<c:set var="pagina" value="Cocktails" />
<!DOCTYPE html>
<html>
<head>
<title>Cocktail Bar - ${pagina}</title>
<link rel="stylesheet" href="${contextPath}/styles/default.css" />
</head>
<body>
	<div class="header">Cocktail Bar</div>
	<c:import url="../navigatie.jsp" />
	<form:form modelAttribute="wrapper" commandName="wrapper" action="cocktailtoegevoegd.html">
		<h2>${pagina}</h2>
		<table>
			<tr>
				<td>Naam :</td>
				<td><form:input path="cocktail.naam" /> <font color="red"> <form:errors path="cocktail.naam" /></font></td>
			</tr>
			<tr>
				<td>Prijs :</td>
				<td><form:input path="cocktail.prijs" /> <font color="red"> <form:errors path="cocktail.prijs" /></font></td>
			</tr>
			
 			<tr>
 				
				<td>Ingredients :</td>
				<td>AlcoholPercentage :</td>
				<td>Hoeveelheid :</td>
			</tr>
			
		
			<%-- JACK'S <c:forEach items="${wrapper.ingredientMap.keySet()}" var="ingredient"> --%>
			<c:forEach var="ingredient" items="${wrapper.ingredientMap}" varStatus="status">
				<c:set var="ingredientSet" value="${ingredient.key}"/>
				<tr>
					<td>${ingredientSet.naam}</td>
					<td>${ingredientSet.alcoholpercentage}</td>
					
   					<td><input name="'hoeveelheid'${ingredientSet.id}" value="${ingredient.value}"/></td>
					
<%-- JACKS'S			<td><form:input path="ingredient.${ingredient.id}" 
 					value="${wrapper.ingredientMap.get(ingredient)}" /></td> --%>
					
				</tr>
				
			</c:forEach>
			<tr>
				<td colspan="2"><input type="submit" value="Toevoegen"
					name="action" /></td>
			</tr>
		</table>
		<br />
	</form:form>
	<br />
	<br />
	<table border="1">
		<th>ID</th>
		<th>Naam</th>
		<th>Prijs</th>
		<c:forEach items="${cocktailList}" var="cocktail">
			<tr>
				<td>${cocktail.id}</td>
				<td>${cocktail.naam}</td>
				<td>${cocktail.prijs}</td>
			</tr>
		</c:forEach>
	</table>
	<br />
	<br />
	<div class="footer">Copyright by Eloisa Ranches (Project
		Spring-MVC-Hibernate)</div>
</body>
</html>

Code:

package be.intecbrussel.web;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.annotation.Resource;
import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import be.intecbrussel.entities.Cocktail;
import be.intecbrussel.entities.Ingredient;
import be.intecbrussel.entities.Samenstelling;
import be.intecbrussel.entities.Wrapper;
import be.intecbrussel.services.CocktailService;
import be.intecbrussel.services.IngredientService;
import be.intecbrussel.services.SamenstellingService;

@Controller
public class CocktailsController {

	private final CocktailService cocktailService;
	
	@Resource
	private IngredientService ingredientService;
	
	@Resource
	private SamenstellingService samenstellingService;
	
	@Autowired
	public CocktailsController(CocktailService cocktailService) {
		this.cocktailService = cocktailService;
	}
	
	@RequestMapping(value = "/cocktailstonen")
	public ModelAndView showCocktails() {
		ModelAndView modelAndView = new ModelAndView("cocktails/cocktailstonen");
		modelAndView.addObject("cocktails", cocktailService.findAll());
		return modelAndView;
	}

	@RequestMapping(value = "/cocktailtoevoegen", method = RequestMethod.GET)
	public ModelAndView cocktailtoevoegen(@Valid Wrapper wrapper) {

		ModelAndView modelAndView = new ModelAndView("cocktails/toevoegen", "wrapper", new Wrapper());
		List<Ingredient> ingredientList = ingredientService.findAll();
		Map<Ingredient, BigDecimal> ingredientMap = new HashMap<Ingredient, BigDecimal>();

		for (Ingredient ingredient: ingredientList)
		{
			ingredientMap.put(ingredient, BigDecimal.ZERO);
		}
		
		wrapper = new Wrapper();
		wrapper.setIngredientMap(ingredientMap);
		
		modelAndView.addObject("wrapper", wrapper);
		return modelAndView;
	}

	@RequestMapping(method = RequestMethod.POST, value = "/cocktailtoegevoegd")
	public ModelAndView cocktailToegevoegd(@Valid @ModelAttribute Wrapper wrapper, 
			BindingResult result, Map<String, Object> map){
		
		ModelAndView modelAndView = new ModelAndView("cocktails/toevoegen");
		System.out.println(wrapper.getIngredientMap().size());
		if (result.hasErrors()) {
			modelAndView.addObject(wrapper);
			return modelAndView;
		} else {
			Samenstelling samenstelling = new Samenstelling();
			Map<Ingredient, BigDecimal> ingredientMap = null;
			ingredientMap.putAll(wrapper.getIngredientMap());
			
			Iterator entries = ingredientMap.entrySet().iterator();
			while (entries.hasNext()) {
			    Map.Entry entry = (Map.Entry) entries.next();
			    Ingredient key = (Ingredient)entry.getKey();
			    BigDecimal value = (BigDecimal)entry.getValue();
			    
			    System.out.println("Key = " + key + ", Value = " + value);
			}
			
			samenstelling.setCocktail(wrapper.getCocktail());
			samenstellingService.create(samenstelling);
			Cocktail cocktail = new Cocktail();
			Cocktail cocktailResult = new Cocktail();
			cocktailResult = cocktail;
			map.put("cocktail", cocktail);
			map.put("cocktailList", cocktailService.findAll());
		}
		return new ModelAndView("redirect:/cocktailtoevoegen");
	}

	@RequestMapping("/cocktailVerwijderen")
	public ModelAndView cocktailVerwijderen(Map<String, Object> map) {
		Cocktail cocktail = new Cocktail();
		map.put("cocktail", cocktail);
		map.put("cocktailList", cocktailService.findAll());
		ModelAndView modelAndView = new ModelAndView("cocktails/verwijderen");
		modelAndView.addObject("cocktails", cocktailService.findAll());
		return modelAndView;
	}

	@RequestMapping(method = RequestMethod.POST, value = "/cocktailVerwijderd")
	public ModelAndView cocktailVerwijderd(@ModelAttribute Cocktail cocktail,
			@RequestParam("id") long id, BindingResult result,
			Map<String, Object> map) {
		Cocktail cocktailResult = new Cocktail();
		cocktailService.delete(cocktail.getId());
		cocktailResult = cocktail;
		map.put("cocktail", cocktail);
		map.put("cocktailList", cocktailService.findAll());
		ModelAndView modelAndView = new ModelAndView("cocktails/verwijderen");
		return modelAndView;
	}
	
	@RequestMapping(value = "/cocktailsIngredients")
	public ModelAndView showIngredients() {
		ModelAndView modelAndView = new ModelAndView("cocktails/cocktailstonen");
		modelAndView.addObject("cocktails", cocktailService.findAll());
		return modelAndView;
	}


}

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The map in my form is not being passed to the controller

beatot23

Programmer

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