eclipse サーバー実行時に「サーバーローカル・ホストの Tomcat8 (Java8) は始動に失敗しました。」と表示されて起動できない

前提・実現したいこと

メール送信を行うプログラムを作成してサーバーで実行したのですが、「サーバーローカル・ホストの Tomcat8 (Java8) は始動に失敗しました。」と表示されて起動できません。テラテイルの質問にも類似の投稿があったため、参考にしたのですが、解決できずでどなたかご助力お願いしたいです。

参考にしたURL
https://www.youtube.com/watch?v=0ignaDR1UOs&t=269s

###実行環境
eclipseのバージョン Oxygen.3a Release (4.7.3a)
Tomcat Tomcat8

###試したこと
サーバーを削除して再度作成し、実行
pom.xmlを削除して実行(pom.xmlを削除して実行したところ、jspが表示されたのでこいつが原因かと考えています。)

発生している問題・エラーメッセージ

log
1重大: A child container failed during start [月 11 29 17:08:08 GMT+09:00 2021]
2重大: A child container failed during start [月 11 29 17:08:08 GMT+09:00 2021]
3重大: The required Server component failed to start so Tomcat is unable to start. [月 11 29 17:08:08 GMT+09:00 2021]
4情報: Pausing ProtocolHandler ["http-nio-8080"] [月 11 29 17:08:08 GMT+09:00 2021]
5情報: Pausing ProtocolHandler ["ajp-nio-8009"] [月 11 29 17:08:08 GMT+09:00 2021]
6情報: サービス Catalina を停止します [月 11 29 17:08:08 GMT+09:00 2021]
7情報: Destroying ProtocolHandler ["http-nio-8080"] [月 11 29 17:08:08 GMT+09:00 2021]
8重大: Failed to destroy end point associated with ProtocolHandler ["http-nio-8080"] [月 11 29 17:08:08 GMT+09:00 2021]
9情報: Destroying ProtocolHandler ["ajp-nio-8009"] [月 11 29 17:08:08 GMT+09:00 2021]
10重大: Failed to destroy end point associated with ProtocolHandler ["ajp-nio-8009"] [月 11 29 17:08:08 GMT+09:00 2021]
11

pom
1<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">
2  <modelVersion>4.0.0</modelVersion>
3  <groupId>poly.edu</groupId>
4  <artifactId>DemoSendEmail</artifactId>
5  <version>0.0.1-SNAPSHOT</version>
6  <packaging>war</packaging>
7  <name>DemoSendEmail</name>
8  <description>DemoSendEmail</description>
9  <dependencies>
10<dependency>
11    <groupId>javax.mail</groupId>
12    <artifactId>mail</artifactId>
13    <version>1.4</version>
14</dependency>
15  </dependencies>
16  <build>
17    <sourceDirectory>src</sourceDirectory>
18    <plugins>
19      <plugin>
20        <artifactId>maven-compiler-plugin</artifactId>
21        <version>3.7.0</version>
22        <configuration>
23          <source>1.8</source>
24          <target>1.8</target>
25        </configuration>
26      </plugin>
27      <plugin>
28        <artifactId>maven-war-plugin</artifactId>
29        <version>3.0.0</version>
30        <configuration>
31          <warSourceDirectory>WebContent</warSourceDirectory>
32        </configuration>
33      </plugin>
34    </plugins>
35  </build>
36</project>

Servlet
1package poly.edu;
2
3import java.io.IOException;
4import java.util.Properties;
5
6import javax.mail.Message;
7import javax.mail.PasswordAuthentication;
8import javax.mail.Session;
9import javax.mail.Transport;
10import javax.mail.internet.InternetAddress;
11import javax.mail.internet.MimeMessage;
12import javax.servlet.RequestDispatcher;
13import javax.servlet.ServletException;
14import javax.servlet.annotation.WebServlet;
15import javax.servlet.http.HttpServlet;
16import javax.servlet.http.HttpServletRequest;
17import javax.servlet.http.HttpServletResponse;
18
19/**
20 * Servlet implementation class SendMailServlet
21 */
22@WebServlet("/SendMailServlet")
23public class SendMailServlet extends HttpServlet {
24	private static final long serialVersionUID = 1L;
25
26    /**
27     * @see HttpServlet#HttpServlet()
28     */
29    public SendMailServlet() {
30        super();
31        // TODO Auto-generated constructor stub
32    }
33
34	/**
35	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
36	 */
37	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
38		RequestDispatcher rd = request.getRequestDispatcher("views/sendemail.jsp");
39		rd.forward(request, response);
40	}
41
42	/**
43	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
44	 */
45	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
46		final String username = "xxxxxxx@gmail.com";
47		final String password = "xxxxxxxxx";
48		Properties prop = new Properties();
49		prop.put("mail.smtp.host", "smtp.gmail.com");
50		prop.put("mail.smtp.port", "587");
51		prop.put("mail.smtp.auth", "true");
52		prop.put("mail.smtp.starttls.enable", "ture"); //TLS
53		Session session = Session.getInstance(prop, new javax.mail.Authenticator(){
54			protected PasswordAuthentication getPasswordAuthentication() {
55			return new PasswordAuthentication(username,password);
56			}
57
58		});
59		//dang nhap dc email
60		String emailTo = request.getParameter("to");
61		String emailSubject = request.getParameter("subject");
62		String emailContent = request.getParameter("content");
63		try {
64			Message message = new MimeMessage(session);
65			message.setFrom(new InternetAddress(username));
66			message.setRecipients(
67					Message.RecipientType.TO,
68					InternetAddress.parse(emailTo)
69					//	InternetAddress.parse("to_username_a@gmail.com, to_username_b@yahoo.com")
70						);
71			message.setSubject(emailSubject);
72			message.setText(emailContent);
73			Transport.send(message);
74			System.out.println("Done");
75		}catch (Exception e) {
76			//TODO: handle exception
77		}
78	}
79
80}

jsp
1<%@ page language="java" contentType="text/html; charset=UTF-8"
2    pageEncoding="UTF-8"%>
3<!DOCTYPE html>
4<html>
5<head>
6<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7
8<link rel="stylesheet"
9	href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
10<script
11	src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
12<script
13	src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
14<title>JSP Page</title>
15</head>
16<body>
17	<div class="container" style="margin-top: 10px;">
18		<div class="row"
19			style="border: 1px darkgrey solid; border-radius: 10px; width: 50%; margin: 0 auto; padding: 20px;">
20			<div class="col-sm-12">
21				<h2 class="myclass">Information</h2>
22				<form action="./SendMailServlet" method="post">
23					<div class="form-group">
24						<label>To:</label>
25						<input type="text"
26						class="form-control" name="to" placeholder="Enter Email">
27					</div>
28					<div class="form-group">
29						<label>Subject:</label>
30						<input type="text"
31						class="form-control" name="subject" placeholder="Enter Subject">
32					</div>
33					<div class="form-group">
34						<label for="content">Content:</label>
35						<textarea class="form-control" rows="3"  name="content"></textarea>
36					</div>
37					<button type="submit" class="btn btn-primary">Send</button>
38					<button type="reset" class="btn btn-primary">Cancel</button>
39				</form>
40			</div>
41		</div>
42	</div>
43</body>
44</html>