How to solve the error message: "Whitelabel Error Page" for Spring Boot - spring-boot

Question

I'm new with spring boot and I'm trying to make a project with Spring MVC + Spring Boot2 + JSP + Spring Data + DB Oracle.
When I run the simple application, The first message error I was been:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri Apr 17 10:20:05 CEST 2020
There was an unexpected error (type=Not Found, status=404).
No message available
I found a lot of documention about this error and I tested different solutions but nothing was fine for my problem. Below the tests I did:
1) I make sure that my main class was in the root package and I put the other packages int the sub level;
2) I used de #ComponentScan in the main class in this way #ComponentScan({"com.dashboard.demo.controller"});
3) in the application.properties I used this command server.servlet.context-path=/oee
This is my code:
Application.properties
spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp
server.servlet.context-path=/oee
## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url= jdbc:oracle:thin:#serverIP:Port:DB11G
spring.datasource.username= Server name
spring.datasource.password= password
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.Oracle10gDialect
# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = create-drop
spring.jpa.show-sql= true
server.port = 8091
Main
package com.dashboard.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
#SpringBootApplication
public class OeeApplication extends SpringBootServletInitializer{
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(OeeApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(OeeApplication.class, args);
}
}
OEEController
package com.dashboard.demo.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.dashboard.demo.entities.OEE;
import com.dashboard.demo.service.OEEService;
#Controller
public class OEEController {
#Autowired
private OEEService oeeService;
#RequestMapping(value = "/oee}", method = RequestMethod.GET)
public String listAll(Model model)
{
List<OEE> oee = oeeService.SelDevice();
model.addAttribute("OEE",oee);
return "oee";
}
}
OEEServiceImpl
package com.dashboard.demo.service;
import java.util.List;
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.dashboard.demo.entities.OEE;
import com.dashboard.demo.repository.OEERepository;
#Service
#Transactional
public class OEEServiceImpl implements OEEService{
#Autowired
private OEERepository oeeRepository;
#Override
public List<OEE> SelDevice()
{
return oeeRepository.findAll();
}
}
OEERepository
package com.dashboard.demo.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.dashboard.demo.entities.OEE;
import com.dashboard.demo.entities.OEEid;
#Repository
public interface OEERepository extends JpaRepository<OEE, OEEid>
{
}
I'm managing a composite key and I've create a class for the composite key and another to manage the entity. I'm catching the error int this package.
package com.dashboard.demo.entities;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Embeddable;
import org.springframework.format.annotation.DateTimeFormat;
import lombok.Data;
#Data
#Embeddable
public class OEEid implements Serializable{
/**
*
*/
private static final long serialVersionUID = 4512114330774744082L;
#DateTimeFormat(pattern = "dd-MM-yy HH:mm:ss")
#Column(name = "MSO_GIORNO_LAV")
private Date date;
#Column(name = "MSO_MACCHINA")
private String device;
public OEEid(Date date, String device) {
super();
this.date = date;
this.device = device;
}
}
package com.dashboard.demo.entities;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.IdClass;
import javax.persistence.Table;
import lombok.Data;
#Entity
#Table(name = "MES_OEE")
#Data
public class OEE implements Serializable
{
/**
*
*/
private static final long serialVersionUID = -7738922358421962399L;
#EmbeddedId
private OEEid oeeID;
#Basic(optional = false)
#Column(name = "MSO_QUANTITA")
private int amount;
#Basic(optional = false)
#Column(name = "MSO_OEE")
private float oee;
}
oee.jsp
<!DOCTYPE html>
<%# taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html lang="en">
<head>
<link rel="stylesheet" type="text/css"
href="webjars/bootstrap/3.3.7/css/bootstrap.min.css" />
<c:url value="/css/main.css" var="jstlCss" />
<link href="${jstlCss}" rel="stylesheet" />
</head>
<body>
<div class="container">
<header>
<h1>Spring MVC + JSP + JPA + Spring Boot 2</h1>
</header>
<div class="starter-template">
<h1>Users List</h1>
<table
class="table table-striped table-hover table-condensed table-bordered">
<tr>
<th>Date</th>
<th>Device</th>
<th>Amount</th>
<th>OEE</th>
</tr>
<c:forEach items="${OEE}" var="oee">
<tr>
<td>${oee.oeeID.date}</td>
<td>${oee.oeeID.device}</td>
<td>${oee.amount}</td>
<td>${oee.oee}</td>
</tr>
</c:forEach>
</table>
</div>
</div>
<script type="text/javascript"
src="webjars/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
</html>
Can anyone give me any suggestions to solve this error message?
Thanks
This is my project directory

Answer 1

Can you please try by removing this server.servlet.context-path=/oee from properties file and try with localhost:8080/oeee