Dear Digy,
To add on, I might think that this is not a glitch.
A TokenStream is usually not stored.
If you change your field attribute to *
org.apache.lucene.document.Field.Store.NO *then there will be no issue.
Developers, any thoughts on this!
Cheers
Ajay
2008/7/8 Ajay Lakhani <[EMAIL PROTECTED]>:
> Dear Digy,
> As of Lucene 2.3, there are new setValue(...) methods that allow you to
> change the value of a Field. However, there seems to be an issue with the
> org.apache.lucene.index.FieldWriter.writeField(...) API that stores the
> string value for the field, which happens to be null in the case of a
> TokenStream.
>
>
> The org.apache.lucene.index.FieldWriter.writeField(...) API needs to be
> changed to verify whether the Field Data is an instance of String, Reader or
> a TokenStream and then retrieve the respective values. I shall patch this
> soon.
>
> Is there a particular reason you are using a TokenStream ? I suggest you
> set the text value directly to the Field: Field1.setValue("xxx");
>
> Moreover, it's best to create a single Document instance, then add multiple
> Field instances to it, but hold onto these Field instances and re-use them
> by changing their values for each added document. After the document is
> added, you then directly change the Field values (idField.setValue(...),
> etc), and then re-add your Document instance. You cannot re-use a single
> Field instance within a Document, and, you should not change a Field's value
> until the Document containing that Field has been added to the index.
>
> 2008/7/8 Digy <[EMAIL PROTECTED]>:
>
> Hi all,
>>
>>
>>
>> I am a Lucene.Net user. Since I need a fast indexing in my current project
>> I try to use Lucene 2.3.2 which I convert to .Net with IKVM(Since Lucene.Net
>> is currently in v2.1) and I use the same instances of document and fields to
>> gain some speed improvements.
>>
>>
>>
>> I use TokenStreams to set the value of fields.
>>
>>
>>
>> My problem is that I get NullPointerException in "addDocument".
>>
>>
>>
>> Exception in thread "main" java.lang.NullPointerException
>>
>> at
>> org.apache.lucene.store.IndexOutput.writeString(IndexOutput.java:99)
>>
>> at
>> org.apache.lucene.index.FieldsWriter.writeField(FieldsWriter.java:127)
>>
>> at
>> org.apache.lucene.index.DocumentsWriter$ThreadState$FieldData.processField(DocumentsWriter.java:1418)
>>
>> at
>> org.apache.lucene.index.DocumentsWriter$ThreadState.processDocument(DocumentsWriter.java:1121)
>>
>> at
>> org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:2442)
>>
>> at
>> org.apache.lucene.index.DocumentsWriter.addDocument(DocumentsWriter.java:2424)
>>
>> at
>> org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1464)
>>
>> at
>> org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1442)
>>
>> at MainClass.Test(MainClass.java:39)
>>
>> at MainClass.main(MainClass.java:10)
>>
>>
>>
>> To show the same bug in Java I prepared a sample application (oh, that was
>> hard since this is my second app. in java(first one was a "Hello World"
>> app.))
>>
>>
>>
>> Is something wrong with my application or is it a bug in Lucene?
>>
>>
>>
>> Thanks,
>>
>> DIGY
>>
>>
>>
>>
>>
>>
>>
>> *SampleCode:*
>>
>> * public class **MainClass***
>>
>> * {*
>>
>> * *
>>
>> * DummyTokenStream **DummyTokenStream1** = new DummyTokenStream();
>> *
>>
>> * DummyTokenStream **DummyTokenStream2** = new DummyTokenStream();
>> *
>>
>> * *
>>
>> * //use the same document&field instances for Indexing*
>>
>> * org.apache.lucene.document.Document **Doc** = new
>> org.apache.lucene.document.Document();*
>>
>> * *
>>
>> * org.apache.lucene.document.Field **Field1** = new
>> org.apache.lucene.document.Field("Field1", "",
>> org.apache.lucene.document.Field.Store.YES,
>> org.apache.lucene.document.Field.Index.TOKENIZED);*
>>
>> * org.apache.lucene.document.Field **Field2** = new
>> org.apache.lucene.document.Field("Field2", "",
>> org.apache.lucene.document.Field.Store.YES,
>> org.apache.lucene.document.Field.Index.TOKENIZED);*
>>
>> * *
>>
>> * public **MainClass**()*
>>
>> * {*
>>
>> * Doc.add(Field1);*
>>
>> * Doc.add(Field2);*
>>
>> * }*
>>
>> * *
>>
>> * *
>>
>> * public void Index() throws *
>>
>> *
>> org.apache.lucene.index.CorruptIndexException,*
>>
>> *
>> org.apache.lucene.store.LockObtainFailedException,*
>>
>> * java.io.IOException*
>>
>> * {*
>>
>> * System.out.println("Index Started"); *
>>
>> * org.apache.lucene.index.IndexWriter wr = new
>> org.apache.lucene.index.IndexWriter("testindex", new
>> org.apache.lucene.analysis.WhitespaceAnalyzer(),true);*
>>
>> * *
>>
>> * for (int i = 0; i < 100; i++)*
>>
>> * {*
>>
>> * PrepDoc();*
>>
>> * wr.addDocument(Doc);*
>>
>> * }*
>>
>> * wr.close();*
>>
>> * System.out.println("Index Completed"); *
>>
>> * }*
>>
>> * *
>>
>> * **void PrepDoc()*
>>
>> * {*
>>
>> * DummyTokenStream1.SetText("test1"); //Set a new Text to
>> Token Stream*
>>
>> * Field1.setValue(DummyTokenStream1); //Set TokenStream to
>> Field Value*
>>
>> * *
>>
>> * *
>>
>> * DummyTokenStream2.SetText("test2"); //Set a new Text to
>> Token Stream*
>>
>> * Field2.setValue(DummyTokenStream2); //Set TokenStream to
>> Field Value*
>>
>> * }*
>>
>> * *
>>
>> * public static void main(String[] args) throws*
>>
>> * org.apache.lucene.index.CorruptIndexException,*
>>
>> * org.apache.lucene.store.LockObtainFailedException,*
>>
>> * java.io.IOException*
>>
>> * {*
>>
>> * MainClass m = new MainClass();*
>>
>> * m.Index();*
>>
>> * }*
>>
>> * *
>>
>> * *
>>
>> * *
>>
>> * *
>>
>> * public class **DummyTokenStream **extends
>> org.apache.lucene.analysis.TokenStream*
>>
>> * {*
>>
>> * String Text = "";*
>>
>> * boolean EndOfStream = false;*
>>
>> * org.apache.lucene.analysis.Token Token = new
>> org.apache.lucene.analysis.Token();*
>>
>> * *
>>
>> * //return "Text" as the first token and null as the second*
>>
>> * public org.apache.lucene.analysis.Token next()*
>>
>> * {*
>>
>> * if (EndOfStream == false)*
>>
>> * {*
>>
>> * EndOfStream = true;*
>>
>> * *
>>
>> * Token.setTermText(Text);*
>>
>> * Token.setStartOffset(0);*
>>
>> * Token.setEndOffset(Text.length() - 1);*
>>
>> * Token.setTermLength(Text.length());*
>>
>> * return Token;*
>>
>> * }*
>>
>> * return null;*
>>
>> * }*
>>
>> * *
>>
>> * public void SetText(String Text)*
>>
>> * {*
>>
>> * EndOfStream = false;*
>>
>> * this.Text = Text;*
>>
>> * }*
>>
>> * }*
>>
>> * *
>>
>> * }*
>>
>>
>>
>>
>>
>
>
