Thread: SIGAR to find CPU info-problem

I tried SIGAR to find the CPU info. I used the following 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[i]);
        }
 
        println("Totals........");
        output(this.sigar.getCpuPerc());
    }
 
    public static void main(String[] args) throws Exception {
        new CpuInfo().processCommand(args);
    }
}

I have no error on compilation.But when i run the code, i got the following errors

E:\java>java CpuInfo
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(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: CpuInfo.  Program will exit.

I think i need to give command line arguements. but i dont know what data to be given as parameter. help me. thanks in advance.

You need to make sure you have the sigar.jar file on your classpath so that when the JVM starts up to run your code, it will know where to find the class CpuInfo.

For more information about classpath see Setting the class path

// Json

Mr.Json, compiled my project using the following command, where "d:\java packages\hyperic-sigar-1.6.3\hyperic-sigar-1.6.3\sigar-bin\lib\sigar.jar" is the path of my sigar.jar.

E:\java>javac CpuInfo.java -classpath "d:\java packages\hyperic-sigar-1.6.3\hype
ric-sigar-1.6.3\sigar-bin\lib\sigar.jar"

There is no error. But while running, i got the following error.

E:\java>java CpuInfo -classpath "d:\java packages\hyperic-sigar-1.6.3\hyperic-si
gar-1.6.3\sigar-bin\lib\sigar.jar"
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(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: CpuInfo. Program will exit.

pls help me

Do you have the .dll or .so files in the right place on your machine?

// Json

Actually i am not aware whether the related dll files are in the right path. Can u help me to place them at the right path?

They need to be on the path somehow, like put the dll in windows/system32 or you could put it in your JDK/jre/lib folder or something like that.

// Json

Ya. i did it. again i am getting the same error .....