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Author Message
scanzee
 Post subject: Communications link failure
PostPosted: Sat Apr 16, 2011 4:45 am 
Newbie

Joined: Sat Apr 16, 2011 4:35 am
Posts: 1
When my applications starts it first connect to the database to load some orders. When my database is unavailable I want to catch the error and show some message. But it seems I can't catch the error below. This is the code where the error occurs. I already try to catch it with "Throwable", "Exception".

I'm using Hibernate 3.6.
Code:
       try {
           Configuration conf = new Configuration();
           conf.configure("hibernateMySQL.cfg.xml");
           [color=#FF0000]_sessionFactory = conf.buildSessionFactory();[/color]
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            //throw new ExceptionInInitializerError(ex);
        }

Code:
10:23:53,820  WARN SettingsFactory:147 - Could not obtain connection to query metadata
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:409)
   at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1118)
   at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:343)
   at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2308)
   at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2122)
   at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:774)
   at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
   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:409)
   at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:375)
   at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:289)
   at java.sql.DriverManager.getConnection(Unknown Source)
   at java.sql.DriverManager.getConnection(Unknown Source)
   at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)
   at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:113)
   at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2836)
   at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2832)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
   at be.deliche.ordermanager.model.persistence.HibernateUtil.<clinit>(HibernateUtil.java:17)
   at main.main(main.java:19)
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:256)
   at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:292)
   ... 20 more
10:23:53,929  INFO BasicTypeRegistry:150 - Type registration [wrapper_characters_clob] overrides previous : org.hibernate.type.CharacterArrayClobType@68a53de4
10:23:53,929  INFO BasicTypeRegistry:150 - Type registration [wrapper_materialized_blob] overrides previous : org.hibernate.type.WrappedMaterializedBlobType@38827968
10:23:53,931  INFO BasicTypeRegistry:150 - Type registration [materialized_blob] overrides previous : org.hibernate.type.MaterializedBlobType@435bb0f
10:23:53,932  INFO BasicTypeRegistry:150 - Type registration [blob] overrides previous : org.hibernate.type.BlobType@638bd7f1
10:23:53,932  INFO BasicTypeRegistry:150 - Type registration [java.sql.Blob] overrides previous : org.hibernate.type.BlobType@638bd7f1
10:23:53,932  INFO BasicTypeRegistry:150 - Type registration [materialized_clob] overrides previous : org.hibernate.type.MaterializedClobType@720e4245
10:23:53,932  INFO BasicTypeRegistry:150 - Type registration [clob] overrides previous : org.hibernate.type.ClobType@620fa83
10:23:53,933  INFO BasicTypeRegistry:150 - Type registration [java.sql.Clob] overrides previous : org.hibernate.type.ClobType@620fa83
10:23:53,933  INFO BasicTypeRegistry:150 - Type registration [characters_clob] overrides previous : org.hibernate.type.PrimitiveCharacterArrayClobType@5f1eb199
10:24:15,328 ERROR SchemaExport:287 - schema export unsuccessful
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:409)
   at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1118)
   at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:343)
   at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2308)
   at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2122)
   at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:774)
   at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
   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:409)
   at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:375)
   at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:289)
   at java.sql.DriverManager.getConnection(Unknown Source)
   at java.sql.DriverManager.getConnection(Unknown Source)
   at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)
   at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:51)
   at org.hibernate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:263)
   at org.hibernate.tool.hbm2ddl.SchemaExport.create(SchemaExport.java:219)
   at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:372)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
   at be.deliche.ordermanager.model.persistence.HibernateUtil.<clinit>(HibernateUtil.java:17)
   at main.main(main.java:19)
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:256)
   at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:292)
   ... 21 more
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