利用SA打印jvm中加载的类

PermTool.java

import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.tools.Tool;

/**
 * @author duqi
 * @createTime 2018/9/1 下午11:55
 **/
public class PermTool extends Tool {
    @Override
    public void run() {
        // Show PermGen object histogram
        ObjectHistogram histo = new ObjectHistogram();
        VM.getVM().getObjectHeap().iterate(histo);
        histo.print();

        // List all classes in PermGen with their ClassLoaders
        VM.getVM().getObjectHeap().iterate(new DefaultHeapVisitor() {

            @Override
            public boolean doObj(Oop obj) {
                if (obj.getKlass() instanceof InstanceKlass) {
                    obj.printValue();
                    Oop loader = ((InstanceKlass) obj.getKlass()).getClassLoader();
                    if (loader == null) {
                        System.out.println(" -- loaded by Bootstrap ClassLoader");
                    } else {
                        System.out.print(" -- loaded by ");
                        loader.printValue();
                        System.out.println();
                    }
                }
                return false;
            }
        });
    }

    public static void main(String[] args) {
        new PermTool().execute(args);
    }
}

JDK版本：1.8.0_151