Java cannot be accessed error from outside package error

Question

CpuPerc() is not public in CpuPerc; cannot be accessed from outside package

...

import org.hyperic.sigar.*;
import org.hyperic.sigar.Cpu;
import org.hyperic.sigar.CpuPerc;

/**
 *
 * @author John
 */

public class GetCpu {
    public void Start() {
            Sigar sigar = new Sigar();
            CpuPerc perc = new CpuPerc();
            System.out.println(getCpuPerc()); // error appears here

    }
}

What is this error and how can I fix it. I am using SIGAR API.

Answer 1

The error message is telling you that instances CpuPerc were not intended to be obtained this way (package-private constructor). getCpuPerc is an instance method of Sigar which returns the required instance.

Sigar sigar = new Sigar();
CpuPerc perc = sigar.getCpuPerc();
System.out.println(perc.getCpuPerc());