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Hibernate swallowing exceptions during buildSessionFactory

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dnoyeb

Post subject: Hibernate swallowing exceptions during buildSessionFactory

Posted: Sun Dec 24, 2006 6:43 pm

Beginner

Joined: Sat Dec 16, 2006 1:52 pm
Posts: 40

I am calling

Code:

            try {
                this.sFactory = getConfiguration().buildSessionFactory();
                int x = 5;
                x++;
            }
            catch (Throwable ex) {
                ex.printStackTrace();
                throw new ConnectionRefusedException(ex);
            }

The network cable is unplugged so hibernate can not connect. So it prints a stacktrace. But its not happening in my catch clause. Instead hibernate is swallowing the exception and not sending anything to my catch.

Is there a way to get hibernate to not swallow the copnnection exception?

org.hibernate.exception.JDBCConnectionException: Cannot open connection

Thanks.

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ajay516

Post subject:

Posted: Mon Jan 01, 2007 11:59 am

Newbie

Joined: Mon Dec 25, 2006 3:14 pm
Posts: 18

> So it prints a stacktrace

From where this trace is printed? not from ex.printStackTrace()?
The api says, it throws HibernateException, catch it and throw it outside accordingly.

http://www.hibernate.org/hib_docs/v3/ap ... onFactory()

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deQuire

Post subject:

Posted: Wed Jan 03, 2007 11:29 am

Newbie

Joined: Mon Jan 01, 2007 10:37 am
Posts: 3

ajay516 wrote:

I have exactly the same problem.

Code:

Configuration c = Main.configuration[tabIndex].configure();
try {
  Main.sessionFactory[tabIndex] = c.buildSessionFactory();            
}
catch (Exception ex) {
  int test = 1;
}

Code never reaches line with test variable, even though there is no database connection and exceptions are thrown.

SEVERE: could not get database metadata
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:2592)
at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:27)
at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:127)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:314)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291)
at deplanner.Controller.createSessionFactory(Controller.java:510)
at deplanner.Controller.connect(Controller.java:201)
at views.cards.ConnectionViewCard.buttonToggleConnectionStateWidgetSelected(ConnectionViewCard.java:466)
at views.cards.ConnectionViewCard.access$1(ConnectionViewCard.java:461)
at views.cards.ConnectionViewCard$2.widgetSelected(ConnectionViewCard.java:181)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at deplanner.Controller.createMainWindow(Controller.java:114)
at deplanner.Main.main(Main.java:64)

** END NESTED EXCEPTION **

Last packet sent to the server was 20 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2658)
at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:27)
at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:127)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:314)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291)
at deplanner.Controller.createSessionFactory(Controller.java:510)
at deplanner.Controller.connect(Controller.java:201)
at views.cards.ConnectionViewCard.buttonToggleConnectionStateWidgetSelected(ConnectionViewCard.java:466)
at views.cards.ConnectionViewCard.access$1(ConnectionViewCard.java:461)
at views.cards.ConnectionViewCard$2.widgetSelected(ConnectionViewCard.java:181)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at deplanner.Controller.createMainWindow(Controller.java:114)
at deplanner.Main.main(Main.java:64)
2007-01-03 16:19:39 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
SEVERE: could not complete schema update
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:2592)
at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:27)
at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:127)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:314)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291)
at deplanner.Controller.createSessionFactory(Controller.java:510)
at deplanner.Controller.connect(Controller.java:201)
at views.cards.ConnectionViewCard.buttonToggleConnectionStateWidgetSelected(ConnectionViewCard.java:466)
at views.cards.ConnectionViewCard.access$1(ConnectionViewCard.java:461)
at views.cards.ConnectionViewCard$2.widgetSelected(ConnectionViewCard.java:181)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at deplanner.Controller.createMainWindow(Controller.java:114)
at deplanner.Main.main(Main.java:64)

** END NESTED EXCEPTION **

Last packet sent to the server was 20 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2658)
at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:27)
at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:127)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:314)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291)
at deplanner.Controller.createSessionFactory(Controller.java:510)
at deplanner.Controller.connect(Controller.java:201)
at views.cards.ConnectionViewCard.buttonToggleConnectionStateWidgetSelected(ConnectionViewCard.java:466)
at views.cards.ConnectionViewCard.access$1(ConnectionViewCard.java:461)
at views.cards.ConnectionViewCard$2.widgetSelected(ConnectionViewCard.java:181)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at deplanner.Controller.createMainWindow(Controller.java:114)
at deplanner.Main.main(Main.java:64)

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Post subject:

Posted: Thu Jan 18, 2007 7:01 pm

Newbie

Joined: Tue Sep 26, 2006 1:43 pm
Posts: 6

Exactly the same problem.
No Exceptions in the try/catch block.

Nobody knows why??

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Post subject:

Posted: Thu Jan 18, 2007 7:52 pm

Newbie

Joined: Tue Sep 26, 2006 1:43 pm
Posts: 6

It looks like I've found the answer here:
http://opensource.atlassian.com/project ... 3?page=all

So I suppose the workaround could be something like this
(doing someting with our Factory):

sessionFactory = configuration.buildSessionFactory();
sessionFactory.openSession().beginTransaction().rollback();

PS
I think the documentation
http://www.hibernate.org/hib_docs/v3/ap ... onFactory()
must have explained the problem in more details.

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ajay516

Post subject:

Posted: Fri Jan 19, 2007 1:32 am

Newbie

Joined: Mon Dec 25, 2006 3:14 pm
Posts: 18

AFIK, buildSessionFactory doesn't try to connect to database. If there is connection failure, then you should expect that error to
arise when you run a query

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dnoyeb

Post subject:

Posted: Mon Jan 22, 2007 2:30 pm

Beginner

Joined: Sat Dec 16, 2006 1:52 pm
Posts: 40

ajay516 wrote:

AFIK, buildSessionFactory doesn't try to connect to database. If there is connection failure, then you should expect that error to
arise when you run a query

It does try to connect. If the connection fails though, it tries to act like it never happened... The exception stack trace below is from the hibernate logs. the method buildSessionFactory does not throw an exception up to my program when this happens. I guess the general strategy is that I should not care about building the session factory, and only care about what happens with opened sessions.

Code:

INFO: Using Hibernate built-in connection pool (not for production use!)
Jan 22, 2007 1:26:36 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Hibernate connection pool size: 20
Jan 22, 2007 1:26:36 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: autocommit mode: false
Jan 22, 2007 1:26:36 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: using driver: org.postgresql.Driver at URL: jdbc:postgresql://localhost:3333/db1
Jan 22, 2007 1:26:36 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: connection properties: {user=postgres}
Jan 22, 2007 1:26:37 PM org.hibernate.cfg.SettingsFactory buildSettings
WARNING: Could not obtain connection metadata
org.postgresql.util.PSQLException: Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
   at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:122)
   at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:65)
   at org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:117)
   at org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30)
   at org.postgresql.jdbc3.Jdbc3Connection.<init>(Jdbc3Connection.java:24)
   at org.postgresql.Driver.connect(Driver.java:235)
   at java.sql.DriverManager.getConnection(DriverManager.java:525)
   at java.sql.DriverManager.getConnection(DriverManager.java:140)
   at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
   at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:72)
   at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1881)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1174)
   at com.rgdsft.hibernate.core.models.HibernateManager.connect(HibernateManager.java:284)

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Post subject:

Posted: Tue Jan 23, 2007 2:42 am

Newbie

Joined: Tue Sep 26, 2006 1:43 pm
Posts: 6

One more nice thing is C3PO.
If it is turned on no exceptions again :)

So I am doing this:
1. buildFactrory.
2. Open session.
3. Turn on C3PO.
4. buildFactory again

Looks ugly...

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