PiotrKulesza：
私は研究のためのプロジェクトに取り組んでいます。今私は、ドッキングウィンドウコンテナにプロジェクトを移動した段階でいます。私は、データベースと私のウェブサイトとMySQLとのplacet Tomcatを持ってドッカ-compose.ymlを行います。あいにくのtomcatのクラスは、データベースに接続できません
Javaコード
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Waliduj {
String url="jdbc:mysql://localhost:3306/uczelnia?useTimezone=true&serverTimezone=UTC";
String username="root";
String password="121212";
public boolean Waliduje(String uname,String pass) {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection(url,username,password);
PreparedStatement st=con.prepareStatement("SELECT email,haslo FROM logowanie WHERE email=? AND haslo=?");
st.setString(1,uname);
st.setString(2,pass);
ResultSet rs = st.executeQuery();
if(rs.next()) {
return true;
}
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException se) {
// TODO Auto-generated catch block
se.printStackTrace();
}
return false;
}
}
Dockerfileコード
FROM tomcat:8.0.41-jre8
COPY ./webapp /usr/local/tomcat/webapps/webapp
CMD ["catalina.sh", "run"]
ドッキングウィンドウ-compose.ymlコード
version: '3'
services:
web:
build: .
ports:
- "8080:8080"
links:
- "db:uczelnia"
db:
image: mysql
environment:
MYSQL_ROOT_PASSWORD: 121212
MYSQL_DATABASE: uczelnia
ports:
- "3306:3306"
PhpMyAdmin:
image: nazarpc/phpmyadmin
ports:
- "8090:80"
links:
- db:mysql
エラーコード
web_1 | com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
web_1 |
web_1 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
web_1 | at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:172)
web_1 | at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
web_1 | at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862)
web_1 | at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:444)
web_1 | at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)
web_1 | at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)
web_1 | at java.sql.DriverManager.getConnection(DriverManager.java:664)
web_1 | at java.sql.DriverManager.getConnection(DriverManager.java:247)
web_1 | at com.login.walidacja.Waliduj.Waliduje(Waliduj.java:20)
web_1 | at com.login.Login.doPost(Login.java:27)
web_1 | at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
web_1 | at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
web_1 | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
web_1 | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
web_1 | at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
web_1 | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
web_1 | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
web_1 | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
web_1 | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
web_1 | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
web_1 | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
web_1 | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
web_1 | at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
web_1 | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
web_1 | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:509)
web_1 | at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104)
web_1 | at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
web_1 | at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2508)
web_1 | at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2497)
web_1 | at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
web_1 | at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
web_1 | at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
web_1 | at java.lang.Thread.run(Thread.java:745)
web_1 | Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure
web_1 |
web_1 | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
web_1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
web_1 | at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
web_1 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
web_1 | at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
web_1 | at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59)
web_1 | at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:103)
web_1 | at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:149)
web_1 | at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:165)
web_1 | at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:92)
web_1 | at com.mysql.cj.NativeSession.connect(NativeSession.java:152)
web_1 | at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:982)
web_1 | at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:852)
web_1 | ... 30 more
web_1 | Caused by: java.net.ConnectException: Connection refused (Connection refused)
web_1 | at java.net.PlainSocketImpl.socketConnect(Native Method)
web_1 | at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
web_1 | at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
web_1 | at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
web_1 | at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
web_1 | at java.net.Socket.connect(Socket.java:589)
web_1 | at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:173)
web_1 | at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:66)
web_1 | ... 33 more
追加情報：
- ドッキングウィンドウがあまりにも窓の上にあるので、私は窓10に取り組んでいます。
- 私はスペルミスをお詫び申し上げますが、英語ではないので、私はポーランドから来たんだ、私の
ニック：
コンファイルを経由して、データベース・サービスは、を介してネットワーク上で参照可能になりますdb。あなたは、単にあなたのコンテナに別の名前を必要としない限り必要ありませんキーワードのリンク。あなたが接続するためにJavaコードを変更した場合にjdbc:mysql://db:3306/uczelnia?useTimezone=true&serverTimezone=UTC期待どおりに動作するはずです。