hengyunabc

package aa;

import java.io.FileDescriptor;
import java.security.Permission;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class ArthasSecurityManager extends SecurityManager {

hengyunabc

当用jdk8编绎，生成target 为 jdk6/7 的代码时，如果有使用到了类似的代码，就会抛出异常

ConcurrentHashMap<String, String> map = new ConcurrentHashMap<String, String>();
map.keySet();

抛出

hengyunabc

import java.util.Date;
import java.util.Random;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;

hengyunabc

import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Arrays;

import abc.Test.AAA;

hengyunabc

import java.util.concurrent.atomic.AtomicInteger;

public class ThreadId {
	// Atomic integer containing the next thread ID to be assigned
	private static final AtomicInteger nextId = new AtomicInteger(0);

	// Thread local variable containing each thread's ID
	private static final ThreadLocal<Integer> threadId = new ThreadLocal<Integer>() {
		@Override
		protected Integer initialValue() {

hengyunabc

import java.util.*;
import org.objectweb.asm.*;

public class CDump implements Opcodes {

	public static byte[] dump() throws Exception {

		ClassWriter cw = new ClassWriter(0);
		FieldVisitor fv;
		MethodVisitor mv;

hengyunabc

/**
 *
 * @author hengyunabc 2017-10-12
 *
 */
public class ClassLoaderUtils {
    @SuppressWarnings({ "restriction", "unchecked" })
    public static URL[] getUrls(ClassLoader classLoader) {
        if (classLoader instanceof URLClassLoader) {
            return ((URLClassLoader) classLoader).getURLs();

hengyunabc

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;

import com.sun.management.UnixOperatingSystemMXBean;

public class Test {

	public static void main(String[] args) {
		OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
		if (operatingSystemMXBean instanceof UnixOperatingSystemMXBean) {

hengyunabc

import java.security.SecureRandom;

public class PenneyGame {
    static SecureRandom random = new SecureRandom();

    public static void main(String[] args) {
        int count = 100;
        int winCount = 0;

        for (int i = 0; i < 100; ++i) {

hengyunabc

import java.util.ArrayList;
import java.util.Stack;

/**
 * from org.apache.commons.io.FilenameUtils
 * 
 * @author hengyunabc
 *
 */
public class MatchUtils {