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POWhy can't I access a remote database through Java?
 

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  1. POWhy can't I access a remote database through Java?
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    <p>I am trying to make an Java application, which needs a connection with a MySQL database to read data.</p> <p>I've read several tutorials and examples, tried almost everything but I just can't get any access to the database. </p> <p>At the moment I am using this to connect to the db:</p> <pre><code>try{ Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection("jdbc:mysql://myhost/test","databaseUser", "password"); } catch (Exception e){ System.out.println(e); } </code></pre> <p>Stacktrace:</p> <blockquote> <p>com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: </p> <p>** BEGIN NESTED EXCEPTION ** </p> <p>com.mysql.jdbc.CommunicationsException MESSAGE: Communications link failure due to underlying exception: </p> <p>** BEGIN NESTED EXCEPTION ** </p> <p>java.io.EOFException MESSAGE: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.</p> <p>STACKTRACE:</p> <p>java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997) at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:573) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044) at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775) at com.mysql.jdbc.Connection.(Connection.java:1555) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285) at java.sql.DriverManager.getConnection(DriverManager.java:582) at java.sql.DriverManager.getConnection(DriverManager.java:185) at facturatiesysteem.SysteemView.zoekKlant(SysteemView.java:148) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jdesktop.application.ApplicationAction.noProxyActionPerformed(ApplicationAction.java:662) at org.jdesktop.application.ApplicationAction.actionPerformed(ApplicationAction.java:698) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6288) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6053) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4651) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:602) at java.awt.EventQueue$1.run(EventQueue.java:600) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$2.run(EventQueue.java:616) at java.awt.EventQueue$2.run(EventQueue.java:614) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:613) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)</p> <p>** END NESTED EXCEPTION **</p> </blockquote> <p>Last packet sent to the server was 16 ms ago.</p> <p>And a lot more...</p> <p>but I just can't get access to it.</p> <p>What can I do here?</p>
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    1. COPlease show us your stack trace (the exception)!!!
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    2. COYes, assuming you get an exception, do `e.printStackTrace()` instead, and show us the output.
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      1. USPaŭlo Ebermann
    3. COBTW: I'd not post the database details in a public forum...
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