NPE when adding a Document to an IndexWriter

[Igal @ getRailo.org]

I keep getting an NPE when trying to add a Doc to an IndexWriter. I've 
minimized my code to very basic code.  what am I doing wrong? pseudo-code:

Document doc = new Document();
TextField ft;

ft = new TextField( "desc1", "word1", Field.Store.YES );
doc.add( ft );

ft = new TextField( "desc2", "word2", Field.Store.YES );
doc.add( ft );            // if I comment out this line then no NPE

IndexWriter iw = new IndexWriter( luceneDirectory, config );

iw.addDocument( doc );    // <== throws NPE


Exception in thread "main" java.lang.NullPointerException
    at 
org.apache.lucene.analysis.util.CharacterUtils$Java5CharacterUtils.fill(CharacterUtils.java:191)
    at 
org.apache.lucene.analysis.util.CharTokenizer.incrementToken(CharTokenizer.java:153)
    at 
org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:102)
    at 
org.apache.lucene.index.DocFieldProcessor.processDocument(DocFieldProcessor.java:307)
    at 
org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:244)
    at 
org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:373)
    at 
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1445)
    at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1124)
    at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1105)
    at s21waf.text.lucene4.Test1.testIndexWriter(Test1.java:71)
    at s21waf.text.lucene4.Test1.main(Test1.java:141)


NPE with StandardTokenizer:

Exception in thread "main" java.lang.NullPointerException
    at 
org.apache.lucene.analysis.standard.StandardTokenizerImpl.zzRefill(StandardTokenizerImpl.java:921)
    at 
org.apache.lucene.analysis.standard.StandardTokenizerImpl.getNextToken(StandardTokenizerImpl.java:1128)
    at 
org.apache.lucene.analysis.standard.StandardTokenizer.incrementToken(StandardTokenizer.java:179)
    at 
org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:102)
    at 
org.apache.lucene.index.DocFieldProcessor.processDocument(DocFieldProcessor.java:307)
    at 
org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:244)
    at 
org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:373)
    at 
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1445)
    at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1124)
    at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1105)
    at s21waf.text.lucene4.Test1.testIndexWriter(Test1.java:75)
    at s21waf.text.lucene4.Test1.main(Test1.java:145)

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