通过调用org.apache.lucene.benchmark.byTask.feeds.TrecGov2Parser.parse获取NullPointerException

Question

I want to pars GOv2 collection format and I want to use TrecGov2Parser . I find its code in this page . The input file is test file and it contains just one document of GOV2 collection. This is my code:

public static void writeHTMLText()
{
    try
    {
        FileWriter fw1= new FileWriter(new File("/home/fl/Desktop/GOV_Text/GOV/00.txt"));
        BufferedWriter bw1 = new BufferedWriter(fw1);

        FileReader fileReader = new FileReader(new File("/home/fl/Desktop/GOV/00"));
        BufferedReader br = new BufferedReader(fileReader);
        String docs="";
        String line;
        while((line=br.readLine())!= null )
              docs= docs+line+"\n";

        DocData docData = new DocData();
        DocData result = new TrecGov2Parser().parse(docData,"result00",new TrecContentSource(),new StringBuilder(docs),TrecDocParser.ParsePathType.GOV2);
        bw1.write(result.getBody());

        br.close();
        bw1.close();
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

I got this error.

java.lang.NullPointerException
    at org.apache.lucene.benchmark.byTask.feeds.TrecGov2Parser.parse(TrecGov2Parser.java:56)
    at LuceneParser.parserInput.writeHTMLText(parserInput.java:63)
I add *lucene-core-3.4.0.jar* and *lucene-benchmark-3.4.0.jar* to my project buildpath.

What do I need to do?

Answer 1

There is no private , protected or public keyword at getHtmlParser() . This means you can call this method only from inside the same package ( default/package visibility ). The method is intended not to be used by others .