Primarly, I wanna express that I am familiar with Sahi on Windows but I am a newbie in Sahi on Linux I am logged in with the "oracle" user and I can successfully open FireFox from shell which is located under "/usr/lib/firefox".
I added the sahi.jar to the NetBeans project. I can successfully compile the java code.
I am currently working on a SLES11 machine which has an Oracle DB 11g (11.1.0.7) on it.
I granted full priviliges to "usr/lib/firefox" using chmod 777.
I am using latest Sahi version (20101103) and Firefox 3.0.6.
However, when I run the java class below, I get an error in the browser.open() line saying that:

java.io.IOException: Cannot run program "/usr/lib/firefox": java.io.IOException: error=13, Permission denied
at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
at java.lang.Runtime.exec(Runtime.java:593)
at java.lang.Runtime.exec(Runtime.java:466)
at net.sf.sahi.util.Utils.executeAndGetProcess(Utils.java:521)
at net.sf.sahi.test.ProcessHelper.execute(ProcessHelper.java:68)
at net.sf.sahi.test.BrowserLauncher.openURL(BrowserLauncher.java:45)
at net.sf.sahi.client.Browser.open(Browser.java:224)
at Main.main(Main.java:35)
Caused by: java.io.IOException: java.io.IOException: error=13, Permission denied
at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
at java.lang.ProcessImpl.start(ProcessImpl.java:65)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
... 7 more

Here is my piece of code:

import java.io.File;
import java.util.*;
import java.lang.*;
import net.sf.sahi.client.Browser;
import net.sf.sahi.config.Configuration;

public class Main {
public static void main(String[] args) {
String sahiBase = "/usr/sbin/sahi"; // where Sahi is installed or unzipped
String userDataDirectory = sahiBase + "/userdata"; //path to the userdata directory
Configuration.initJava(sahiBase, userDataDirectory); // Sets up configuration for proxy. Sets Controller to java mode.

String osType = System.getProperty("os.name").toLowerCase();

if ((osType.indexOf("nix") > 0) || (osType.indexOf("nux") > 0)) {
String browserPath = "/usr/lib/firefox";
String browserProcessName = "firefox";
String browserOption = "-profile /usr/sbin/sahi/userdata/browser/ff/profiles/sahi0 -no-remote";

// Create a browser and open it
Browser browser = new Browser(browserPath, browserProcessName, browserOption);
browser.open();

browser.navigateTo("http://www.google.com";
browser.textbox("q").setValue("sahi forums");
browser.submit("Google Search").click();
browser.link("Sahi - Web Automation and Test Tool").click();
browser.link("Login").click();
System.out.println("Check: " + browser.textbox("req_username").exists());

// close the browser
browser.close();
}
}