Hallo Zusammen,
ich habe folgendes Problem:
Ich versuche auf eine Online MySQL-Datenbank ( u.a. DB4Free.net ) zuzugreifen.
Ich bekomme jedesmal folgende Fehlermeldung:
Der Zugriff auf eine lokale MySQL-DB klappt ohne Probleme. Jemand eine Idee?
Grüßle
Bjarki
ich habe folgendes Problem:
Ich versuche auf eine Online MySQL-Datenbank ( u.a. DB4Free.net ) zuzugreifen.
Java:
private static String DRIVER_CLASS = "com.mysql.jdbc.Driver";
private static String CONNECT_URL = "jdbc:mysql://db4free.net:3306/DBNAME";
private static String USER = "username";
private static String PWD = "pw";
public static Connection getConnection() throws ClassNotFoundException, SQLException
{
Class.forName(DRIVER_CLASS);
Properties prop = new Properties();
if (USER != null)
prop.setProperty("user", USER);
if (PWD != null)
prop.setProperty("password", PWD);
return DriverManager.getConnection(CONNECT_URL, prop);
}
Ich bekomme jedesmal folgende Fehlermeldung:
Java:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: 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(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1119)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2257)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:784)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:354)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at SQL.jdbcwebserver.getConnection(jdbcwebserver.java:61)
at SQL.jdbcwebserver.checkConnection(jdbcwebserver.java:19)
at SQL.jdbcwebserver.main(jdbcwebserver.java:66)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: 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(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1119)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:343)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2178)
... 14 more
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:292)
... 15 more
Der Zugriff auf eine lokale MySQL-DB klappt ohne Probleme. Jemand eine Idee?
Grüßle
Bjarki
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