[ Moved to lucene-dev. ]
Perhaps we should first look for these in a lucene properties file that is found on the classpath with Classloader.getResource(). Then an applet can just include a different properties file to override these. The file could be something like "org/apache/lucene/lucene.properties". We could even include versions of the file designed for applet use, for read-only use (e.g., CDROM), etc.
Doug
Jon Schuster wrote:
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:[EMAIL PROTECTED] 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" <[EMAIL PROTECTED]> To: "Lucene Users List" <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> To: "Lucene Users List" <[EMAIL PROTECTED]> 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/[EMAIL PROTECTED]/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" <[EMAIL PROTECTED]> To: "Lucene Users List" <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> To: "Lucene Users List" <[EMAIL PROTECTED]> 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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