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From Jon Schuster <j...@wrq.com>
Subject RE: Lucene Search Applet
Date Mon, 23 Aug 2004 17:25:37 GMT
Hi all,

The changes I made to get past the System.getProperty issues are essentially
the same in the three files org.apache.lucene.index.IndexWriter,
org.apache.lucene.store.FSDirectory, and
org.apache.lucene.search.BooleanQuery.

Change the static initializations from a form like this:

  public static long WRITE_LOCK_TIMEOUT = 
 
Integer.parseInt(System.getProperty("org.apache.lucene.writeLockTimeout",
      "1000"));

to a separate declaration and static initializer block like this:

   public static long WRITE_LOCK_TIMEOUT;
   static
   {
	try
	{
                WRITE_LOCK_TIMEOUT =
Integer.parseInt(System.getProperty("org.apache.lucene.writeLockTimeout",
"1000"));
	}
	catch ( Exception e )
	{
	    WRITE_LOCK_TIMEOUT = 1000;
	}
   };

As before, the variables are initialized when the class is loaded, but if
the System.getProperty fails, the variable still gets initialized to its
default value in the catch block.

You can use a separate static block for each variable, or put them all into
a single static block. You could also add a setter for each variable if you
want the ability to set the value separately from the class init.

In the FSDirectory class, the variables DISABLE_LOCKS and LOCK_DIR are
marked final, which I had to remove to do the initialization as described.

I've also attached the three modified files if you want to just copy and
paste.

--Jon

-----Original Message-----
From: Simon mcIlwaine [mailto:smcilwaine@lendac.ie] 
Sent: Monday, August 23, 2004 7:37 AM
To: Lucene Users List
Subject: Re: Lucene Search Applet


Hi,

Just used the RODirectory and I'm now getting the following error:
java.security.AccessControlException: access denied
(java.util.PropertyPermission user.dir read) I'm reckoning that this is what
Jon was on about with System.getProperty() within certain files because im
using an applet. Is this correct and if so can someone show me one of the
hacked files so that I know what I need to modify.

Many Thanks

Simon
.
----- Original Message -----
From: "Simon mcIlwaine" <smcilwaine@lendac.ie>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>
Sent: Monday, August 23, 2004 3:12 PM
Subject: Re: Lucene Search Applet

> Hi Stephane,
>
> A bit of a stupid question but how do you mean set the system property
> disableLuceneLocks=true? Can I do it from a call from FSDirectory API or
do
> I have to actually hack the code? Also if I do use RODirectory how do I go
> about using it? Do I have to update the Lucene JAR archive file with
> RODirectory class included as I tried using it and its not recognising the
> class?
>
> Many Thanks
>
> Simon
>
> ----- Original Message -----
> From: "Stephane James Vaucher" <vauchers@cirano.qc.ca>
> To: "Lucene Users List" <lucene-user@jakarta.apache.org>
> Sent: Monday, August 23, 2004 2:22 PM
> Subject: Re: Lucene Search Applet
>
>
> > Hi Simon,
> >
> > Does this work? From FSDirectory api:
> >
> > If the system property 'disableLuceneLocks' has the String value of
> > "true", lock creation will be disabled.
> >
> > Otherwise, I think there was a Read-Only Directory hack:
> >
> > http://www.mail-archive.com/lucene-user@jakarta.apache.org/msg05148.html
> >
> > HTH,
> > sv
> >
> > On Mon, 23 Aug 2004, Simon mcIlwaine wrote:
> >
> > > Thanks Jon that works by putting the jar file in the archive
attribute.
> Now
> > > im getting the disablelock error cause of the unsigned applet. Do I
just
> > > comment out the code anywhere where System.getProperty() appears in
the
> > > files that you specified and then update the JAR Archive?? Is it
> possible
> > > you could show me one of the hacked files so that I know what I'm
> modifying?
> > > Does anyone else know if there is another way of doing this without
> having
> > > to hack the source code?
> > >
> > > Many thanks.
> > >
> > > Simon
> > >
> > > ----- Original Message -----
> > > From: "Jon Schuster" <jons@wrq.com>
> > > To: "Lucene Users List" <lucene-user@jakarta.apache.org>
> > > Sent: Saturday, August 21, 2004 2:08 AM
> > > Subject: Re: Lucene Search Applet
> > >
> > >
> > > > I have Lucene working in an applet and I've seen this problem only
> when
> > > > the jar file really was not available (typo in the jar name), which
is
> > > > what you'd expect. It's possible that the classpath for your
> > > > application is not the same as the classpath for the applet; perhaps
> > > > they're using different VMs or JREs from different locations.
> > > >
> > > > Try referencing the Lucene jar file in the archive attribute of the
> > > > applet tag.
> > > >
> > > > Also, to get Lucene to work from an unsigned applet, I had to modify
a
> > > > few classes that call System.getProperty(), because the properties
> that
> > > > were being requested were disallowed for applets. I think the
classes
> > > > were IndexWriter, FSDirectory, and BooleanQuery.
> > > >
> > > > --Jon
> > > >
> > > >
> > > > On Aug 20, 2004, at 6:57 AM, Simon mcIlwaine wrote:
> > > >
> > > > > Im a new Lucene User and I'm not too familiar with Applets either
> but
> > > > > I've
> > > > > been doing a bit of testing on java applet security and if im
> correct
> > > > > in
> > > > > saying that applets can read anything below there codebase then my
> > > > > problem
> > > > > is not a security restriction one. The error is reading
> > > > > java.lang.NoClassDefFoundError and the classpath is set as I have
it
> > > > > working
> > > > > in a Swing App. Does someone actually have Lucene working in an
> > > > > Applet? Can
> > > > > it be done?? Please help.
> > > > >
> > > > > Thanks
> > > > >
> > > > > Simon
> > > > >
> > > > > ----- Original Message -----
> > > > >
> > > > > From: "Terry Steichen" <terry@net-frame.com>
> > > > > To: "Lucene Users List" <lucene-user@jakarta.apache.org>
> > > > > Sent: Wednesday, August 18, 2004 4:17 PM
> > > > > Subject: Re: Lucene Search Applet
> > > > >
> > > > >
> > > > > I suspect it has to do with the security restrictions of the
applet,
> > > > > 'cause
> > > > > it doesn't appear to be finding your Lucene jar file.  Also,
> regarding
> > > > > the
> > > > > lock files, I believe you can disable the locking stuff just for
> > > > > purposes
> > > > > like yours (read-only index).
> > > > >
> > > > > Regards,
> > > > >
> > > > > Terry
> > > > >   ----- Original Message -----
> > > > >   From: Simon mcIlwaine
> > > > >   To: Lucene Users List
> > > > >   Sent: Wednesday, August 18, 2004 11:03 AM
> > > > >   Subject: Lucene Search Applet
> > > > >
> > > > >
> > > > >   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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