jdk1.7.0 installation on ubuntu 10.10

Question

I am new to ubuntu 10.10 and am using it as VM. I tried installing jdk 1.7 to run java programs from terminal. I followed the instructions from the link: How to Install Oracle Java on Ubuntu Linux. After installation was complete, i tried to test run a Hello World java program. The program compiled successfully when i did javac Hello.java. However when i tried to run the program using java Hello, it didnt give any output on the terminal and gave me the following:

Unable to launch the application.

Exception:

CouldNotLoadArgumentException[ Could not load file/URL specified: Hello]
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)    

Wrapped Exception

java.io.FileNotFoundException: Hello (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:97)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)

Further i tried checking my version for java using java -version and it gave the following output:

 Java(TM) Web Start 10.0.0.147-fcs 
Usage:  javaws [run-options] <jnlp-file>    
        javaws [control-options]        
    where run-options include:          
  -verbose          display additional output   
  -offline          run the application in offline mode 
  -system           run the application from the system cache only
  -Xnosplash        run without showing a splash screen 
  -J<option>        supply option to the vm 
  -wait             start java process and wait for its exit    

control-options include:    
  -viewer           show the cache viewer in the java control panel
  -clearcache       remove all non-installed applications from the cache
  -uninstall        remove all applications from the cache
  -uninstall <jnlp-file>                remove the application from the cache   
  -import [import-options] <jnlp-file>  import the application to the cache 

import-options include:                     
  -silent           import silently (with no user interface)    
  -system           import application into the system cache    
  -codebase <url>   retrieve resources from the given codebase  
  -shortcut         install shortcuts as if user allowed prompt 
  -association      install associations as if user allowed prompt

I see here that its using javaws when i try to run program using java.

I dont understand why this is happening or what is going wrong. Any help would be very much appreciated. Am just a beginner on Ubuntu. Thanks in advance!!

---

Edit 1 Hello.java:

public class Hello
{
    public static void main(String... s)
    {
        System.out.println("Hello World.!!!");
    }
}

Answer 1

Your output from java -version give you the ouput from javaws -version. So this seems to be a linking error in your filesystem. If you use update-alternatives, you create a symbolic link in your binary-folder (/usr/bin). Maybe you had some typo while going through the tutorial? I'm pretty sure it was something like sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_05/bin/javaws" 1 or something like this.

You could try to reenter the "update-alternative" commands.