Java SE (Java Platform, Standard Edition)

Hi!I'm kind a new to world of Java!I started to learn about java but im not a master(that's why i came here)!
I want to make an app that give me the current cpu load and available ram(oh i forgot to mention that i use Linux Mint 8 wich is based on Ubuntu 10.04)and i want my app to run on both linux and windows machine!So for that i tried to use the sigar api(system information gatherer and report) ,wich is a open source project that was written for java language but it have bindings for python,ruby perl....

So i started to look at some examples that they distribute and i choose the CpuInfo.java
Here's the code:

package org.hyperic.sigar.cmd;

import org.hyperic.sigar.CpuPerc;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarLoader;
import org.hyperic.sigar.SigarException;

/**
 * Display cpu information for each cpu found on the system.
 */
public class CpuInfo extends SigarCommandBase {

    public boolean displayTimes = true;
    
    public CpuInfo(Shell shell) {
        super(shell);
    }

    public CpuInfo() {
        super();
    }

    public String getUsageShort() {
        return "Display cpu information";
    }

    private void output(CpuPerc cpu) {
        println("User Time....." + CpuPerc.format(cpu.getUser()));
        println("Sys Time......" + CpuPerc.format(cpu.getSys()));
        println("Idle Time....." + CpuPerc.format(cpu.getIdle()));
        println("Wait Time....." + CpuPerc.format(cpu.getWait()));
        println("Nice Time....." + CpuPerc.format(cpu.getNice()));
        println("Combined......" + CpuPerc.format(cpu.getCombined()));
        println("Irq Time......" + CpuPerc.format(cpu.getIrq()));
        if (SigarLoader.IS_LINUX) {
            println("SoftIrq Time.." + CpuPerc.format(cpu.getSoftIrq()));
            println("Stolen Time...." + CpuPerc.format(cpu.getStolen()));
        }
        println("");
    }

    public void output(String[] args) throws SigarException {
        org.hyperic.sigar.CpuInfo[] infos =
            this.sigar.getCpuInfoList();

        CpuPerc[] cpus =
            this.sigar.getCpuPercList();

        org.hyperic.sigar.CpuInfo info = infos[0];
        long cacheSize = info.getCacheSize();
        println("Vendor........." + info.getVendor());
        println("Model.........." + info.getModel());
        println("Mhz............" + info.getMhz());
        println("Total CPUs....." + info.getTotalCores());
        if ((info.getTotalCores() != info.getTotalSockets()) ||
            (info.getCoresPerSocket() > info.getTotalCores()))
        {
            println("Physical CPUs.." + info.getTotalSockets());
            println("Cores per CPU.." + info.getCoresPerSocket());
        }

        if (cacheSize != Sigar.FIELD_NOTIMPL) {
            println("Cache size...." + cacheSize);
        }
        println("");

        if (!this.displayTimes) {
            return;
        }

        for (int i=0; i<cpus.length; i++) {
            println("CPU " + i + ".........");
            output(cpus);

}



println("Totals........");

output(this.sigar.getCpuPerc());

}



public static void main(String[] args) throws Exception {

new CpuInfo().processCommand(args);

}

}
Now i want to compile it:In terminal i type:
javac -cp "sigar.jar" CpuInfo.java
No error's so i go to run it and i type 
java CpuInfo
, but now start the problems:
Exception in thread "main" java.lang.NoClassDefFoundError: CpuInfo (wrong name: org/hyperic/sigar/cmd/CpuInfo)

	at java.lang.ClassLoader.defineClass1(Native Method)

	at java.lang.ClassLoader.defineClass(ClassLoader.java:621)

	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)

	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)

	at java.net.URLClassLoader.access$000(URLClassLoader.java:56)

	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)

	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)

	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)

Could not find the main class: CpuInfo. Program will exit.
Before i came here i done a lot of researche's and i found that the problem might be that my java machine cant find my sigar package(wich is sigar.jar).
So my question is how can i resolve these error's?
My sigar.jar is in the same directory with CpuInfo.java!

Please help me!
Thank's and please excuse my bad english skills!

Edited by: fioan89 on Mar 11, 2010 7:42 AM