Thank you, Robert, substituting getAttribute with addAttribute worked! But I don't understand why. Could you help me to understand the mechanics?
In my setting, hasAttribute(PayloadAttribute.class) returns false. So I thought addAttribute(PayloadAttribute.class) would just create a new PayloadAttribute object. It would remedy the Exception, but it wouldn't do any good accessing the payload generated upstream. But the newly generated PayloadAttribute t is actually getting the payload that was generated upstream (by my Tokenizer). How is this possible? On Dec 3, 2010, at 7:30 PM, Robert Muir wrote: > On Fri, Dec 3, 2010 at 10:15 PM, Teruhiko Kurosaka <k...@basistech.com> wrote: >> Hello, >> I have a Tokenizer that generates a Payload, and a TokenFilter that uses it. >> These work well with Solr 1.4.0 (therefore Lucene 2.9.1?), but when >> I switched to the trunk version (I rebuilt the Tokenizer and TokenFilter >> using the Lucene jar from the trunk and ran it), I encountered with >> this error: >> >> java.lang.IllegalArgumentException: This AttributeSource does not have the >> attribute 'org.apache.lucene.analysis.tokenattributes.PayloadAttribute'. >> >> This exception comes from this line in the TokenFilter code: >> >> payloadAtt = (PayloadAttribute) getAttribute(PayloadAttribute.class); >> > > I recommend you use addAttribute instead. Its buggy to use > getAttribute in this way because you cannot rely upon the fact that a > previous tokenstream has added the attribute[1]. I think your code was > only working before because of TokenWrapperAttributeFactory (the > backwards compatibility layer in 2.9 for the old Token API) being > present. > > [1] > http://lucene.apache.org/java/2_9_0/api/core/org/apache/lucene/util/AttributeSource.html#getAttribute(java.lang.Class) > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > ---- T. "Kuro" Kurosaka, 415-227-9600x122, 617-386-7122(direct) --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
