RE: [Webunitproj-users] random errors - please help!

[Brian K. <bt...@ne...>]

I figured out what is happening... there is a bug in the way an onchange
event is fired for a select tag.  Currently when you set an option on a
select drop-down, ExplorerNativeWebClient only has a handle to
WebOptionField, with this it tries to get it's parent (the select tag)
by calling el.getParentElement().  Unfortunately the parent is sometimes
null which is causing the null pointer exception on line 657.  Don't
know why it's randomly null though.

I was able to create a hacked fix locally, by firing the onchange event
directly on the select tag, rather than getting the option's parent.
The clean fix will be much more involved though, and I will probably
need to get some feedback on the best implementation approach in order
to create a patch.

Thanks,

Brian



-----Original Message-----
From: Doron [mailto:dg...@sh...]=20
Sent: Monday, July 21, 2003 8:54 AM
To: Brian Knorr
Cc: web...@li...
Subject: Re: [Webunitproj-users] random errors - please help!

Hi Brian,

	Sounds like there maybe a spurious timing issue (hard to solve
as it is
spurious). It would hard to debug it without actually being there. Is
there some javascript that changes the page while web unit is trying to
do something?

	It looks like the error is here:

com/zeborg/webunit/ie/ExplorerNativeWebClient.setOption
(ExplorerNativeWebClient.java:65

	You may want to look at that line of code and see what would
cause a
null pointer exception there.

			-Doron


=09

On Sun, 2003-07-20 at 16:49, Brian Knorr wrote:
> We are encountering some very strange problems with webunit... we can
> run a webunit script with no problems and then run it again an
> encounter errors ("Bad Stuff happened")... it's very random - we
cannot
> cause something to fail consistently.  Here is one of the stack
> tracing we get when these random errors occur... please help...
thanks.
>=20
> =20
>=20
> =20
>=20
> java.lang.NullPointerException
>=20
>             at com/zeborg/webunit/ie/ExplorerNativeWebClient.setOption
> (ExplorerNativeWebClient.java:657)
>=20
>             at java/lang/reflect/Method.invoke (Method.java)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.process
> (RemoteProcessServer.java:125)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.run
> (RemoteProcessServer.java:179)
>=20
>             at com/zeborg/webunit/ie/ExplorerIORPCServer.main
> (ExplorerIORPCServer.java:35)
>=20
> toStrign(Th)
>=20
> toString(Throwable)
>=20
> toString(Throwable)
>=20
> Error invoking method:setOption er:java.rmi.RemoteException: Error
> invoking method:java.rmi.RemoteException: Error on invoking:
>
com.zeborg.webunit.ie.ExplorerNativeWebClient.setOptionjava.lang.reflect
.InvocationTargetException
>=20
>             at java/lang/reflect/Method.invoke (Method.java)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.process
> (RemoteProcessServer.java:125)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.run
> (RemoteProcessServer.java:179)
>=20
>             at com/zeborg/webunit/ie/ExplorerIORPCServer.main
> (ExplorerIORPCServer.java:35)
>=20
> =20
>=20
> RootCause:java.lang.RuntimeException: Error in
> click:java.lang.NullPointerException
>=20
>             at com/zeborg/webunit/ie/ExplorerNativeWebClient.setOption
> (ExplorerNativeWebClient.java:657)
>=20
>             at java/lang/reflect/Method.invoke (Method.java)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.process
> (RemoteProcessServer.java:125)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.run
> (RemoteProcessServer.java:179)
>=20
>             at com/zeborg/webunit/ie/ExplorerIORPCServer.main
> (ExplorerIORPCServer.java:35)
>=20
> =20
>=20
>             at com/zeborg/webunit/ie/ExplorerNativeWebClient.setOption
> (ExplorerNativeWebClient.java:660)
>=20
>             at java/lang/reflect/Method.invoke (Method.java)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.process
> (RemoteProcessServer.java:125)
>=20
>             at com/zeborg/iorpc/RemoteProcessServer.run
> (RemoteProcessServer.java:179)
>=20
>             at com/zeborg/webunit/ie/ExplorerIORPCServer.main
> (ExplorerIORPCServer.java:35)
>=20
> =20
>=20
>             <<no stack trace available>>