Re: [ojb-users] no help with exception messsages

[<Ste...@eu...>]

Though the exception chaining is implemented in the
PersistenceBrokerException class (it contains a source exception), we h=
ave
no debug information from the source exception (PersistenceBrokerExcept=
ion
doesn't override printStackTrace methods from java.lang.Throwable is no=
t
overridden).

It can be done for example this way:

public class PersistenceBrokerException extends RuntimeException
{
    .
    .
    .
  public void printStackTrace() {
    super.printStackTrace();
    Throwable cause =3D getSourceException();
    if(cause !=3D null) {
      System.err.println("Caused by:");
      cause.printStackTrace();
    }
  }

  public void printStackTrace(java.io.PrintStream ps) {
    super.printStackTrace(ps);
    Throwable cause =3D getSourceException();
    if (cause !=3D null) {
      ps.println("Caused by:");
      cause.printStackTrace(ps);
    }
  }

  public void printStackTrace(java.io.PrintWriter pw) {
    super.printStackTrace(pw);
    Throwable cause =3D getSourceException();
    if (cause !=3D null) {
      pw.println("Caused by:");
      cause.printStackTrace(pw);
    }
  }
}

Stefan



|--------+---------------------------------------------->
|        |          Thomas Mahler                       |
|        |          <tho...@ho...>         |
|        |          Odeslal:                            |
|        |          obj...@li...urc|
|        |          eforge.net                          |
|        |          04.06.2002 07:57                    |
|        |                                              |
|--------+---------------------------------------------->
  >--------------------------------------------------------------------=
----------------------------|
  |                                                                    =
                            |
  |       Komu:   Arvind Gudipati <Arv...@PA...>, ojb   =
                            |
  |       <obj...@li...>                   =
                            |
  |       Kopie:                                                       =
                            |
  |       P=F8edm=ECt:     Re: [ojb-users] no help with exception messs=
ages                            |
  |                                                                    =
                            |
  |                                                                    =
                            |
  >--------------------------------------------------------------------=
----------------------------|



Hi Arvind,

Arvind Gudipati wrote:

>    I was getting a ojb.broker.PersistenceBrokerSQLException on severa=
l
> occasion .. i had to debug the source files of OJB to find the reason=

> that i was inserting NULLs to a NOT NULL column or the column name wa=
s
> not existing etc.,
>
> I thought it would be helpful if when the exception is thrown, there =
are
> some helpful messages of what REALLY is the problem..
>
>
> Check out for example JdbcAccess.java line:153 the exception is simpl=
e
> consumed ...
>


Mhh, I don't know which method of JdbcAccess you are referring to, as I=

have only new code than release 0.8.400 at hand.

There should not be any place where exceptions are just consumend
without deeper reason.

typically exceptions are sometimes caught, converted to a PBException
and then rethrown.
In rare cases exceptions are just consumed. In those cases there should=

be a comment why this is done. And typically those things are logged.

hth,

Thomas


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