Re: Communications link failure

[Renato Filipov]

Hi, I still have this problem since may 2010, but I can't solve it...

In my case, the error occours in my Tomcat and also in some threads running with Java.

Heeeelp please!!




com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
at sun.reflect.GeneratedConstructorAccessor77.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:1074)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2104)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:729)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.GeneratedConstructorAccessor17.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:302)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:283)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.technique.engine.data.ConnectionPool.A(Unknown Source)
at com.technique.engine.data.ConnectionPool.B(Unknown Source)
at com.technique.engine.data.ConnectionPool.getConnection(Unknown Source)
at com.technique.engine.data.AbstractPersistentEntity.getConnection(Unknown Source)
at com.futuware.maquina.data.social.PerfilEntity.retrieveConnection(PerfilEntity.java:122)
at com.futuware.maquina.app.factory.facebook.RobotFacebook.getPerfil(RobotFacebook.java:120)
at com.futuware.maquina.app.factory.facebook.RobotFacebook.run(RobotFacebook.java:42)
at java.lang.Thread.run(Unknown Source)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
at sun.reflect.GeneratedConstructorAccessor77.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:1074)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2873)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2763)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3299)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:894)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3808)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1256)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2032)
... 18 more
Caused by: 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:2332)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2774)
... 24 more