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From "Simon mcIlwaine" <smcilwa...@lendac.ie>
Subject Lucene Search Applet
Date Wed, 18 Aug 2004 15:03:01 GMT
Im developing a Lucene CD-ROM based search which will search html pages on CD-ROM, using an
applet as the UI. I know that theres a problem with lock files and also security restrictions
on applets so I am using the RAMDirectory. I have it working in a Swing application however
when I put it into an applet its giving me problems. It compiles but when I go to run the
applet I get the error below. Can anyone help? Thanks in advance.
Simon

Error:

Java.lang.noClassDefFoundError: org/apache/lucene/store/Directory

At: Java.lang.Class.getDeclaredConstructors0(Native Method)

At: Java.lang.Class.privateGetDeclaredConstructors(Class.java:1610)

At: Java.lang.Class.getConstructor0(Class.java:1922)

At: Java.lang.Class.newInstance0(Class.java:278)

At: Java.lang.Class.newInstance(Class.java:261)

At: sun.applet.AppletPanel.createApplet(AppletPanel.java:617)

At: sun.applet.AppletPanel.runloader(AppletPanel.java:546)

At: sun.applet.AppletPanel.run(AppletPanel.java:298)

At: java.lang.Thread.run(Thread.java:534)

Code:

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.Query;

import org.apache.lucene.search.TermQuery;

import org.apache.lucene.store.RAMDirectory;

import org.apache.lucene.store.Directory;

import org.apache.lucene.index.Term;

import org.apache.lucene.search.Hits;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.io.*;

public class MemorialApp2 extends JApplet implements ActionListener{

JLabel prompt;

JTextField input;

JButton search;

JPanel panel;

String indexDir = "C:/Java/lucene/index-list";

private static RAMDirectory idx;

public void init(){

Container cp = getContentPane();

panel = new JPanel();

panel.setLayout(new FlowLayout(FlowLayout.CENTER, 4, 4));

prompt = new JLabel("Keyword search:");

input = new JTextField("",20);

search = new JButton("Search");

search.addActionListener(this);

panel.add(prompt);

panel.add(input);

panel.add(search);

cp.add(panel);

}

public void actionPerformed(ActionEvent e){

if (e.getSource() == search){

String surname = (input.getText());

try {

findSurname(indexDir, surname);

} catch(Exception ex) {

System.err.println(ex);

}

}

}

public static void findSurname(String indexDir, String surname) throws Exception{

idx = new RAMDirectory(indexDir);

IndexSearcher searcher = new IndexSearcher(idx);

Query query = new TermQuery(new Term("surname", surname));

Hits hits = searcher.search(query);

for (int i = 0; i < hits.length(); i++) {

//Document doc = hits.doc(i);

System.out.println("Surname: " + hits.doc(i).get("surname"));

}

}

}

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