Why I keep getting error at Query parser when using lucene

Question

Hello guys I am currently parsing all the html body for finding the document frequency of a list containing a words and why I keep getting this error

org.apache.lucene.queryParser.ParseException: Cannot parse '': Encountered "<EOF>" at line 1, column 0.

Was expecting one of: ... "+" ... "-" ... "(" ... "" ... ... ... ... ... "[" ... "{" ... ... ... "" ...

at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:211)
at CalculateWeightTable.search(CalculateWeightTable.java:221)
at CalculateWeightTable.calculate(CalculateWeightTable.java:134)
at FocusedCrawlingMain.Search(FocusedCrawlingMain.java:64)
at View.actionPerformed(View.java:219)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

and this is my code for finding the document frequency

and it says that the error was when the lucene try to parse the queryString

which is at this section of my code

Query query = parser.parse(queryString);

I dont know why it keep giving me error while parsing the queryString

private static int search(Searcher searcher, String queryString)
        throws ParseException, IOException {

    // Build a Query object
    StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "content",
            analyzer);
    Query query = parser.parse(queryString);

    // Search for the query
    TopScoreDocCollector collector = TopScoreDocCollector.create(10, true);
    searcher.search(query, collector);

    ScoreDoc[] hit = collector.topDocs().scoreDocs;

    int hitsCount = hit.length;

    if (hitsCount == 0) {
        //System.out.println("No matches were found for \"" + queryString+ "\"");
    } else {
        //System.out.println("hit count : " + collector.getTotalHits());

    }

    return collector.getTotalHits();
}

John Topley · Accepted Answer · 2013-12-05 10:07:29Z

2

Looks like queryString object is empty. Can you check the inputs to this method from where it's invoked.

edited Dec 5, 2013 at 10:07

John Topley

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answered Jan 13, 2012 at 5:06

hakish

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1 Comment

Carlo Over a year ago

Ah yes its empty tq very much . i thought that it was the parser cannot parse special characters. therefore I'm confused why. ok tq btw

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