Skip navigation links

MySQL Forums :: Connector/JDBC and Java :: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:


Advanced Search

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
Posted by: Vincent Gigon ()
Date: April 14, 2010 09:43AM

Hi,

I have a problem that apparently many MySQL/Java users/developers had already faced, but none of the threads I have read until now solved my problem.

When I try to open my web based application (hosted on computer A) on computer B, I receive the following message in the java console :

=================================================================================
Java Plug-in 1.6.0_07

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: java.net.ConnectException: Connection refused: connect

STACKTRACE:

java.net.SocketException: java.net.ConnectException: Connection refused: connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2666)
at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.bms.java.screens.DatabaseBMS.getConnection(DatabaseBMS.java:66)
at com.bms.java.db.LoginDAO.getPassword(LoginDAO.java:31)
at com.bms.java.screens.tree.LoginApplet.validateUser(LoginApplet.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSInvoke.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
at sun.plugin.com.MethodDispatcher.invoke(Unknown Source)
at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
at sun.plugin.com.DispatchImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin.com.DispatchImpl.invoke(Unknown Source)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2741)
at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.bms.java.screens.DatabaseBMS.getConnection(DatabaseBMS.java:66)
at com.bms.java.db.LoginDAO.getPassword(LoginDAO.java:31)
at com.bms.java.screens.tree.LoginApplet.validateUser(LoginApplet.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSInvoke.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
at sun.plugin.com.MethodDispatcher.invoke(Unknown Source)
at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
at sun.plugin.com.DispatchImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin.com.DispatchImpl.invoke(Unknown Source)
java.lang.NullPointerException
at com.bms.java.db.LoginDAO.getPassword(LoginDAO.java:33)
at com.bms.java.screens.tree.LoginApplet.validateUser(LoginApplet.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSInvoke.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
at sun.plugin.com.MethodDispatcher.invoke(Unknown Source)
at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
at sun.plugin.com.DispatchImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin.com.DispatchImpl.invoke(Unknown Source)

=================================================================================

Connecting to the MySQL database (located on computer A) from computer B with MySQL Query Browser works fine.

Firewall is disabled on both computers.

Executing the aplication on computer A (localhost) works fine, with the same Java version/configuration.

I believe that it's not a problem in the application's code, but in the java configuration.

MySQL version = 5.1
Java version = 1.6.0_07


What could be the problem ???

Thanks for your help !

Options: ReplyQuote


Subject Written By Posted
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: Vincent Gigon 04/14/2010 09:43AM
Re: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: Jay Khimani 06/17/2010 06:00AM
Re: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: Jay Khimani 06/22/2010 02:13PM
Re: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: aaaa bbb 07/07/2010 08:44AM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.