How to fix PrivilegeEscalation in java code

I scanned my project using IBM AppScan tool. The tool is generated report and it contains one 'Medium' defect type. The defect is: 'PrivilegeEscalation',

Defect detail: CWE-266: Incorrect Privilege Assignment

Defect Detail:

About Issue: PrivilegeEscalation - com.application.....ect;Object):int null
PrivilegeEscalation
Severity: Medium
API: java.lang.reflect.Method.invoke(Object;Object[]); Object
Caller: com.application.TestComparator.compare(Object:Object):int at line 19

Call
method.invoke(classObject.cast(object1),new Object()[][0])

Java Code:

package com.application;
import java.lang.reflect.Method;
import java.util.Comparator;

public class TestComparator implements Comparator {

private Class classObject;
private String functionName;

public TestComparator(Class pojoClass,String methodName){
    this.classObject = pojoClass;
    this.functionName = methodName;
}

public int compare(Object object1, Object object2) {
    try{
        Method method =classObject.getMethod(("get"+functionName));
        String value1 =method.invoke(classObject.cast(object1)).toString();
        String value2 =method.invoke(classObject.cast(object2)).toString();
        return value2.compareTo(value1);
    }catch(Exception ex){
        //  ex.printStackTrace();
    }
    return 0;
}}

Please help me Thanks in advance.