Thymeleaf error spring boot jpa
Question
good morining every body,
i working in a project using spring boot and i'm trying to integrate thymleaf to get information from the database,it's the first time i use thymleaf,
Here my entity class:
package com.org.model;
import java.io.Serializable;
import javax.persistence.*;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import java.math.BigDecimal;
import java.util.List;
/**
* The persistent class for the countries database table.
*
*/
@Entity
@Table(name="countries")
//@NamedQuery(name="Country.findAll", query="SELECT c FROM Country c")
public class Country implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name="COUNTRY_ID")
private String countryId;
@Column(name="COUNTRY_NAME")
private String countryName;
//bi-directional many-to-one association to Region
@ManyToOne
@JoinColumn(name="REGION_ID")
private Region region;
//bi-directional many-to-one association to Location
@JsonIgnore
@OneToMany(mappedBy="country")
private List<Location> locations;
public Country() {
}
public String getCountryId() {
return this.countryId;
}
public void setCountryId(String countryId) {
this.countryId = countryId;
}
public String getCountryName() {
return this.countryName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
public Region getRegion() {
return this.region;
}
public void setRegion(Region region) {
this.region = region;
}
public List<Location> getLocations() {
return this.locations;
}
public void setLocations(List<Location> locations) {
this.locations = locations;
}
public Location addLocation(Location location) {
getLocations().add(location);
location.setCountry(this);
return location;
}
public Location removeLocation(Location location) {
getLocations().remove(location);
location.setCountry(null);
return location;
}
}
here is my controller:
package com.org.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.org.model.Country;
import com.org.repository.CountryRepository;
@Controller // This means that this class is a Controller
@RequestMapping(path="/api", produces=MediaType.APPLICATION_JSON_VALUE) // This means that this class is a Controller
public class CountryController {
@Autowired // This means to get the bean called userRepository
// Which is auto-generated by Spring, we will use it to handle the data
private CountryRepository countryRepository;
@RequestMapping(value="/country", method= RequestMethod.GET)
public String list(Model model){
model.addAttribute("Country", countryRepository.findAll());
// This returns a JSON or XML with the users
return "countries";
}
// @RequestMapping(path="/country/{countryId}")
// public @ResponseBody Country getCountry(@PathVariable String countryId) {
// return countryRepository.findOne(countryId);
// }
}
i create a html file to plot the information:
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/extras/spring-security">
<head lang="en">
</head>
<body>
<div class="container">
<!--/*/ <th:block th:include="fragments/header :: header"></th:block> /*/-->
<div th:if="${not #lists.isEmpty(countries)}">
<table class="table table-striped">
<tr>
<th>Country Id</th>
<th>Country Name</th>
<th>Region Id</th>
<th>Location</th>
</tr>
<tr th:ForEach="Country : ${countries}">
<td th:text="${Country.countryId}">id country</td>
<td th:text="${Country.countryName}">Country Name</td>
<td th:text="${Country.region}">Region Id</td>
<td th:text="${Country.locations}">Location</td>
</tr>
</table>
</div>
</div>
</body>
</html>
i added th thymleaf dependency to the pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>xxxx.org</groupId>
<artifactId>project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>webService</name>
<description>first project for university</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf-spring4</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
i got no error but white screen no erro in the console:
[screenshot of the localhost] https://i.stack.imgur.com/6xx1l.png
2 answers
solution1
0 2017-11-03 11:59:53
<tr th:ForEach="countries : ${countries}">
In the above line you are using countries which is referencing to list and each item in the list and unable to differentiate. So you can try the below code snippet
<tr th:ForEach="country : ${countries}">
solution2
0 2017-11-03 12:54:59
You're defining the attribute "Country" in your model and populating it with the list of countries:
model.addAttribute("Country", countryRepository.findAll());
But then you're looking for "countries":
<div th:if="${not #lists.isEmpty(countries)}">
So you can either do this:
model.addAttribute("countries", countryRepository.findAll());
Or this:
<div th:if="${not #lists.isEmpty(Country)}">
...
<tr th:ForEach="element : ${Country}">
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