之前电脑安装过很多myeclipse版本，导致过期了，后续继续安装也提示过期。今天特意来彻底解决**不成功问题。

达到效果：**成功如图

1.首先安装**手册操作，导致出现MyEclipse提示过期Your 30-day trial of MyEclipse has expired. 

并未解决**成功，以下是我使用的工具和手册。

2.后来在网上找了一篇文章，通过运行java程序来生成**码，代码如下：

mport java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Created by panda on 2018/5/23.
 * 注册MyEclipse***生成
 */

public class RegistCodeTest {
    private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.";

    public String getSerial(String userId, String licenseNum) {

        java.util.Calendar cal = java.util.Calendar.getInstance();

        cal.add(1, 3);

        cal.add(6, -1);

        java.text.NumberFormat nf = new java.text.DecimalFormat("000");

        licenseNum = nf.format(Integer.valueOf(licenseNum));

        String verTime = new StringBuilder("-").append(

                new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime()))

                .append("0").toString();

        String type = "YE3MP-";

        String need = new StringBuilder(userId.substring(0, 1)).append(type)

                .append("300").append(licenseNum).append(verTime).toString();

        String dx = new StringBuilder(need).append(LL).append(userId)

                .toString();

        int suf = this.decode(dx);

        String code = new StringBuilder(need).append(String.valueOf(suf))

                .toString();

        return this.change(code);

    }

    private int decode(String s) {

        int i;

        char[] ac;

        int j;

        int k;

        i = 0;

        ac = s.toCharArray();

        j = 0;

        k = ac.length;

        while (j < k) {

            i = (31 * i) + ac[j];

            j++;

        }

        return Math.abs(i);

    }

    private String change(String s) {

        byte[] abyte0;

        char[] ac;

        int i;

        int k;

        int j;

        abyte0 = s.getBytes();

        ac = new char[s.length()];

        i = 0;

        k = abyte0.length;

        while (i < k) {

            j = abyte0[i];

            if ((j >= 48) && (j <= 57)) {

                j = (((j - 48) + 5) % 10) + 48;

            } else if ((j >= 65) && (j <= 90)) {

                j = (((j - 65) + 13) % 26) + 65;

            } else if ((j >= 97) && (j <= 122)) {

                j = (((j - 97) + 13) % 26) + 97;

            }

            ac[i] = (char) j;

            i++;

        }

        return String.valueOf(ac);

    }

    public RegistCodeTest() {

        super();

    }

    public static void main(String[] args) {

        try {

            System.out.println("请输入注册名:");

            BufferedReader reader = new BufferedReader(new InputStreamReader(

                    System.in));

            String userId = null;

            userId = reader.readLine();

            RegistCodeTest myeclipsegen = new RegistCodeTest();

            String res = myeclipsegen.getSerial(userId, "0");

            System.out.println("生成的***:" + res);

            reader.readLine();

        } catch (IOException ex) {

        }

    }
}

运行后效果如下:

 

修改String res = myeclipsegen.getSerial(userId, "20"); 中"20"为"0"可以变成Number of Licenses为Unlimited.

 然后

然后将刚才生成的***输入

点击下面的Finish即可

代码测试过了，可行！

从Myeclipse--》subscription information 即可进入update subscription界面。

3.操作完上面的步骤，并未解决问题，冒出新的问题： 

product activation must be completed within 5 days “产品**必须要在5天内完成”

4.没办法，继续找方法

发现下面又有一个方法，继续尝试，结果还是未能**成功。

操作如下：

按照网上搜索的方法，怎么试，都是**不成功，提示：product activation must be completed within 5 days

后来实在没办法，就尝试了最后一种：用管理员打开cmd，转到*****目录，执行java -jar cracker.jar命令，打开cracker.jar后按照以下操作说明：

最后打开myeclipse，终于成功了

不知道别人都成功，就我不成功。

5.继续找方法，发现百度有一篇文章写的不错，后来试试，终于解决了我的问题

解决MyEclipse注册失败的问题

https://jingyan.baidu.com/article/acf728fd49519ff8e410a361.html