<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="bellemaison.controller" />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
        autowire="byName">
        <property name="driverClassName" value="org.postgresql.Driver" />
        <property name="url" value="jdbc:postgresql://localhost:5432/bellemaison" />
        <property name="username" value="user" />
        <property name="password" value="passw0rd" />
    </bean>

    <bean id="propertyDAO" class="bellemaison.dao.JdbcPropertyDAO">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

</beans>

package bellemaison.model;

public class Property {
    private int id;
    private String address;
    private int size;
    private int bedroom;
    private int bathroom;
    private double price;

    public Property() {

    }

    public Property(String address, int size, int bedroom, int bathroom, double price) {
        this.address = address;
        this.size = size;
        this.bedroom = bedroom;
        this.bathroom = bathroom;
        this.price = price;
    }

    public int getId() { return id; }

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

    public String getAddress() { return address; }

    public void setAddress(String address) { this.address = address; }

    public int getSize() { return size; }

    public void setSize(int size) { this.size = size; }

    public int getBedroom() { return bedroom; }

    public void setBedroom(int bedroom) { this.bedroom = bedroom; }

    public int getBathroom() { return bathroom; }

    public void setBathroom(int bathroom) { this.bathroom = bathroom; }

    public double getPrice() { return price; }

    public void setPrice(double price) { this.price = price; }

}

package bellemaison.dao;

import bellemaison.model.Property;

import java.util.List;


public interface PropertyDAO {

    public void saveOrUpdate(Property property);

    public void delete(int propertyID);

    public Property get(int propertyID);

    public List<Property> list();
}

package bellemaison.dao;

import bellemaison.model.Property;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowMapper;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;


public class JdbcPropertyDAO implements PropertyDAO {
    private JdbcTemplate jdbcTemplate;
    private javax.sql.DataSource dataSource;

    public JdbcPropertyDAO(javax.sql.DataSource dataSource) {
        jdbcTemplate = new JdbcTemplate(dataSource);
    }

    public JdbcPropertyDAO() {
    }

...

    public List<Property> list() {
        String sql = "SELECT * FROM properties";
        List<Property> listProperty = jdbcTemplate.query(sql, new RowMapper<Property>() {

            @Override
            public Property mapRow(ResultSet resultSet, int i) throws SQLException {
                Property aProperty = new Property();

                aProperty.setId(resultSet.getInt("id"));
                aProperty.setAddress(resultSet.getString("address"));
                aProperty.setSize(resultSet.getInt("size"));
                aProperty.setBedroom(resultSet.getInt("bedroom"));
                aProperty.setBathroom(resultSet.getInt("bathroom"));
                aProperty.setPrice(resultSet.getDouble("price"));

                return aProperty;
            }
        });

        return listProperty;

    }

    public void setDataSource(javax.sql.DataSource dataSource) {
        this.dataSource = dataSource;
    }

    public javax.sql.DataSource getDataSource() {
        return dataSource;
    }

};

package bellemaison.controller;

import bellemaison.dao.JdbcPropertyDAO;
import bellemaison.dao.PropertyDAO;
import bellemaison.model.Property;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import java.io.IOException;
import java.util.List;


@Controller
public class Properties {

    @Autowired PropertyDAO propertyDAO;

    @RequestMapping("/properties_all")
    public ModelAndView listProperty(ModelAndView model) throws IOException {
        List<Property> listProperty = propertyDAO.list();
        model.addObject("listProperty", listProperty);
        model.setViewName("home");

        return model;
    }

}

<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <meta charset="utf-8">
    <link rel="stylesheet" href="main.css">
    <link href="/resources/css/main.css" rel="stylesheet">
    <title>Contact Result</title>
</head>
<body>
<div align="center">
    <h1>Property List</h1>
    <table border="1">
        <th>Address</th>
        <th>Size</th>
        <th>Bedroom</th>
        <th>Bathroom</th>
        <th>Price</th>

        <c:forEach var="property" items="${listProperty}" varStatus="status">
            <tr>
                <td>${property.address}</td>
                <td>${property.size}</td>
                <td>${property.bedroom}</td>
                <td>${property.bathroom}</td>
                <td>${property.price}</td>
            </tr>
        </c:forEach>
    </table>
</div>
</body>
</html>

HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException

type Exception report

message Request processing failed; nested exception is java.lang.NullPointerException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NullPointerException
    bellemaison.dao.JdbcPropertyDAO.list(JdbcPropertyDAO.java:80)
    bellemaison.controller.Properties.listProperty(Properties.java:23)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:180)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:440)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)