Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.lang.ref.Reference;
import java.lang.reflect.Field;
import java.util.Arrays;

public class Main {
    public static void dumphreadLocals()
            throws NoSuchFieldException, IllegalAccessException, ClassNotFoundException {
        Thread thread = Thread.currentThread();
        Field threadLocalField = thread.getClass().getDeclaredField("threadLocals");
        threadLocalField.setAccessible(true);
        Object threadLocalTable = threadLocalField.get(thread);

        Class threadLocalMapClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");
        //Class threadLocalMapClass = Class.forName(threadLocalField.getType().getName());
        Field tableField = threadLocalMapClass.getDeclaredField("table");
        tableField.setAccessible(true);
        Object[] table = (Object[]) tableField.get(threadLocalTable);

        Class threadLocalMapEntryClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap$Entry");
        Field entryValueField = threadLocalMapEntryClass.getDeclaredField("value");
        entryValueField.setAccessible(true);

        //Field referenceField = Reference.class.getDeclaredField("referent") ;
        //referenceField.setAccessible(true);

        for (Object entry : table) {
            if (entry != null) {
                Object threadLocalValue = entryValueField.get(entry);
                printObject(threadLocalValue);
                //ThreadLocal threadLocal = (ThreadLocal)referenceField.get(entry);
                //System.out.println("thread local  value "+threadLocal);
            }
        }
    }

    static void printObject(Object obj) {
        System.out.println("find threadlocal var:" + obj);
        if (obj instanceof Object[]) {
            System.out.println("array:" + Arrays.deepToString((Object[]) obj));
        } else if (obj instanceof Reference) {
            Reference ref = (Reference) obj;
            System.out.println("ref: " + ref.getClass().getName() + ",ref to " + ref.get());
        } else {
            System.out.println("others: " + obj);
        }
    }
}