asked on

ClassCastException

Hi,

I keep getting a java.lang.ClassCastException exception on the following page and don't know why.

<jsp:useBean id="db" scope="session" class="dbpackage.dbbean" />
<%
db.LogoffFromDb();
session.invalidate();
response.sendRedirect("maxlogin.jsp");
%>

Bean code:

public void LogoffFromDb () throws Exception
{
if (GlobalConn != null) {
try {
GlobalConn.close();
}
catch (Exception ignored) {}
}

}

Regards

TimYates

>> <jsp:useBean id="db" scope="session" class="dbpackage.dbbean" />

I'm guessing this is causing it...

is there a class dbpackage.dbbean?

is it a bean?

Can I also suggest (as a sideline) that classes should start with a Capital Letter, and methods with a small letter...

That tends to be the norm, and makes your code much more easily readable and understandable :-)

Tim

barnarp

ASKER

Thanks,

yes there is such a class which I also use in other pages, and it is a bean.

TimYates

Can you put:

<%
Object o = session.getAttribute( "db" ) ;
if( o != null )
out.println( db.getClass().getName() ) ;
%>

to see what the attribute in the session actually is?

I assume you do a similar bit of code on other pages... can you compare them to this?

What's the difference?

barnarp

ASKER

Found the problem.

db was also the name of another session variable which was type String.

That's why the cast error.

Thanks for the help

TimYates

that would do it ;-)

glad you got it sorted :-)

Tim

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