EclipseのJavaからDB(MySQL)に急に接続できなくなる

前提・実現したいこと

ここに質問の内容を詳しく書いてください。

昨日は普通にJabaプログラムからDB(MySQL)に接続できていたのに、
急につながらなくなりました。エラーメッセージを検索して
色々対処法を探しましたが、解決できず悩んでおります。
どたなか回答していただけると幸いです。

発生している問題・エラーメッセージ

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
	at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)
	at java.sql.DriverManager.getConnection(DriverManager.java:664)
	at java.sql.DriverManager.getConnection(DriverManager.java:247)
	at sample.abc.doPost(abc.java:61)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:681)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:196)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1673)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
	at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
	at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:317)
	at com.mysql.cj.protocol.a.NativeAuthenticationProvider.connect(NativeAuthenticationProvider.java:203)
	at com.mysql.cj.protocol.a.NativeProtocol.connect(NativeProtocol.java:1369)
	at com.mysql.cj.NativeSession.connect(NativeSession.java:133)
	at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:948)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:818)
	... 30 more
Caused by: java.net.SocketException: Software caused connection abort: recv failed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:171)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
	at sun.security.ssl.InputRecord.read(InputRecord.java:503)
	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)
	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)
	at com.mysql.cj.protocol.ExportControlled.performTlsHandshake(ExportControlled.java:335)
	at com.mysql.cj.protocol.StandardSocketFactory.performTlsHandshake(StandardSocketFactory.java:194)
	at com.mysql.cj.protocol.a.NativeSocketConnection.performTlsHandshake(NativeSocketConnection.java:101)
	at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:308)
	... 35 more

該当のソースコード

Java
1package sample;
2
3import java.io.IOException;
4import java.sql.Connection;
5import java.sql.DriverManager;
6import java.sql.PreparedStatement;
7import java.sql.ResultSet;
8import java.sql.SQLException;
9
10import javax.servlet.ServletException;
11import javax.servlet.annotation.WebServlet;
12import javax.servlet.http.HttpServlet;
13import javax.servlet.http.HttpServletRequest;
14import javax.servlet.http.HttpServletResponse;
15
16/**
17 * Servlet implementation class Helloservlet
18 */
19@WebServlet("/abc")
20public class abc extends HttpServlet {
21	private static final long serialVersionUID = 1L;
22       
23    /**
24     * @see HttpServlet#HttpServlet()
25     */
26    public abc() {
27        super();
28        // TODO Auto-generated constructor stub
29    }
30
31	/**
32	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
33	 */
34	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
35		// TODO Auto-generated method stub
36	}
37	/**
38	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
39	 */
40	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
41		// TODO Auto-generated method stub
42		doGet(request, response);
43		
44		response.setContentType("text/html; charset=UTF-8");
45		
46		Connection con = null;
47		PreparedStatement stmt = null;
48	    ResultSet rs = null;
49
50			
51		String productname = request.getParameter("productname");
52		String productprice = request.getParameter("productprice");
53		int productprice2 = Integer.parseInt(productprice);
54		
55		String sql = "INSERT INTO productlist VALUES(?,?);";
56		
57		 try {
58	            // JDBCドライバのロード
59	            Class.forName("com.mysql.cj.jdbc.Driver");
60	            // データベース接続
61	            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb?", "root", "root");
62	        
63	            // SQL実行準備
64	            stmt = con.prepareStatement(sql);
65	         
66	            stmt.setString(1, productname);
67				stmt.setInt(2, productprice2);
68				
69	            // 実行結果取得
70	            rs = stmt.executeQuery();
71
72	      // データがなくなるまで(rs.next()がfalseになるまで)繰り返す
73	            while (rs.next()) {
74	                String id = rs.getString("code");
75	                String name = rs.getString("name");
76	                String price = rs.getString("price");
77	                String gazou = rs.getString("gazou");
78
79	                System.out.println(id + ":" + name);
80	            }
81	        } catch (ClassNotFoundException e) {
82	        	e.printStackTrace();
83	            System.out.println("JDBCドライバのロードでエラーが発生しました");
84	        } catch (SQLException e) {
85	        	e.printStackTrace();
86	            System.out.println("データベースへのアクセスでエラーが発生しました。");
87	        } finally {
88	            try {
89	                if (con != null) {
90	                    con.close();
91	                }
92	            } catch (SQLException e) {
93	                System.out.println("データベースへのアクセスでエラーが発生しました。");
94	            }
95	        }
96	    }
97
98	    
99		
100
101	}
102
103
104