关于myeclipse6.5使用中遇到的一些问题

1.我是从别人电脑上把整个myeclipse拷贝下来的，打开就会提示看错误文件。原因是路径不对，找到myclipse快捷方式，右键属性，看里面的路径，和你本机放myeclipse的路径是否一致，改这个快捷方式的路径或者将文件夹放到快捷方式指定的路径。

2.关于myeclipse的注册码失效，这里有个自动生成注册码的java文件，运行就可以了，会生成一个注册码。有效日期和公司名可以自己在程序中修改

import java.text.DecimalFormat; import java.text.NumberFormat; import java.text.SimpleDateFormat; import java.util.Calendar;public class Chack { //myeclipseBlue6.5破解,运行即可得到key    public static final void main(String[] args){         String id="wzl";   //这是指注册的名称        String num="999";         System.out.println(getSerial(id,"100",num,false));      }     public static String getSerial(String userId, String version,             String licenseNum, boolean selected) {         Calendar cal = Calendar.getInstance();         cal.add(1, 3);         cal.add(6, -1);         NumberFormat nf = new DecimalFormat("000");         licenseNum = nf.format(Integer.valueOf(licenseNum));         String verTime = selected ? (new StringBuffer("-")).append(                 (new SimpleDateFormat("yyMMdd")).format(cal.getTime())).append(                 "0").toString() : "-1412310";//这的时间是指注册到期时间，可以自己修改        String type = "YE3MB-";         String need = (new StringBuffer(String.valueOf(userId.substring(0, 1))))                 .append(type).append(version).append(licenseNum)                 .append(verTime).toString();         String dx = (new StringBuffer(String.valueOf(need)))                 .append(                         "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.")                                           .append(userId).toString();         int suf = decode(dx);         String code = (new StringBuffer(String.valueOf(need))).append(                 String.valueOf(suf)).toString();         return change(code);     }    private static int decode(String s) {         int i = 0;         char ac[] = s.toCharArray();         int j = 0;         for (int k = ac.length; j < k; j++)             i = 31 * i + ac[j];        return Math.abs(i);     }    private static String change(String s) {         byte abyte0[] = s.getBytes();         char ac[] = new char[s.length()];         int i = 0;         for (int k = abyte0.length; i < k; i++) {             int 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;         }        return String.valueOf(ac);     } }

3.导入项目后，错误提示the project was not build since its build path is incomplete.cannot find the class file for java.lang.Object.fix the build path then try building this project.这是因为没有正确的jre system library.打开myeclipse 选择 windows->preferences->java->installed jres 在右侧点击add弹出如图对话框

填写jre name,如jdk1.5,然后选择jre所在的路径。

jre安装好后，选择Project->java build path.在右侧选择libraries，将原来的jre system library移除，选择add library,在弹出的对话框中选择jre system library.点击next,选择你所安装的那个jre就ok了。

4.不能使用debug模式，错误提示为a configuration error occurred during startup.please verify the preference filed with the prompt:...

点击configuration,弹出tomcat 的配置框。网上说是因为tomcat和jdk版本不匹配。我这里的原因是上面第3点填写jre name 写的是java。这里要写成jdkx.x改成jdk1.5就可以用debug了。