java.lang.ClassCastException error in Eclipse

[jacky521]

eclipse3.3.1+eclipseme1.7.6+wtk2.5.2 +sdk1.6.0

error is:
java.lang.ClassCastException
at Login.commandAction(+1)
at javax.microedition.lcdui.Display$DisplayAccessor.commandAction(+282)
at javax.microedition.lcdui.Display$DisplayManagerImpl.commandAction(+10)
at com.sun.midp.lcdui.DefaultEventHandler.commandEvent(+68)
at com.sun.midp.lcdui.AutomatedEventHandler.commandEvent(+47)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.handleVmEvent(+186)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+57)

"Errors during build.
***Errors running builder 'Preverification' on project 'Login'.*
Illegal Manifest Entry Key or Value "de.schlichtherle.io.ArchiveFileSystem$ArchiveReadOnlyException: Archive file is read-only!"
de.schlichtherle.io.ArchiveFileSystem$ArchiveReadOnlyException: Archive file is read-only! ".

problem occurred
building workspace error running builder "preverification" on project 'Login'.*

Source not found
The JAR of the classfile belongs to the container 'J2ME library [sun java wirless toolkit 2.5.1 for cldc/defaultcolorphone ]' which does not allow modifications to source attachments on its entries.

and below error while integrate the wtk2.5.1

set platform failed reason no message java.lang.reflect.invocationtargetexception

problem occurred
launching new_configuration errors during build error running builder"preverification"

i can't login, both okCommand and exitCommand are out of work, and i can't display icons and images, or no display on the emulator.
i really can't solve these problems in eclipse, please help!
waiting on line.
thanks.

[jacky521]

source code is:
import java.io.IOException;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class Login extends MIDlet implements CommandListener
{
private Display display;
private static String menuItems[]={
"移动监控","移动查询","移动报警","系统设置" };
private List mainMenu=new List("欢迎使用移动监控系统", List.IMPLICIT,menuItems,null);
//二级菜单
private static String monitorItems[]={"图像监控","区域组监控"};
private List monitor =new List("移动监控",List.IMPLICIT,monitorItems,null);
private static String queryItems[]={"信息点属性","信息点实时值","信息点历史值"};
private List query = new List("移动查询",List.IMPLICIT,queryItems,null);
private static String warningItems[]={"信息点历史报警查询","信息点实时报警查询"};
private List warning=new List("移动报警",List.IMPLICIT,warningItems,null);
private static String settingItems[]={"账号密码管理","信息点组设置"};
private List setting=new List("系统设置",List.IMPLICIT,settingItems,null);

//三级菜单
private static String imageControlItems[]={"实时图像获取","历史图像检查"};
private List image =new List("图像监控",List.IMPLICIT,imageControlItems,null);
private static String groupControlItems[]={"区域信息点监控","实时详情监控"};
private List group =new List("区域组监控",List.IMPLICIT,groupControlItems,null);

private static String propertyItems[]={"信息点名称","信息点描述"};
private List property =new List("信息点属性",List.IMPLICIT,propertyItems,null);
private static String realtimeItems[]={"按信息点组","按信息点名称","按信息点描述"};
private List realtime =new List("信息点实时值",List.IMPLICIT,realtimeItems,null);
private static String recordItems[]={"按历史信息点组","按历史信息点名称","按历史信息点描述"};
private List record =new List("信息点历史值",List.IMPLICIT,recordItems,null);

private static String recordqueryItems[]={"按报警组","按报警信息点名称","按报警信息点描述"};
private List recordquery =new List("信息点历史报警查询",List.IMPLICIT,recordqueryItems,null);
private static String realtimequeryItems[]={"上上限","上限","下限","下下限"};
private List realtimequery =new List("信息点实时报警查询",List.IMPLICIT,realtimequeryItems,null);

private static String manageItems[]={"按报警组","按报警信息点名称","按报警信息点描述"};
private List manage =new List("账号密码管理",List.IMPLICIT,manageItems,null);
private static String infogroupItems[]={ "报警分组设置","查询分组设置","监控分组设置"};
private List infogroup =new List("信息点组设置",List.IMPLICIT,infogroupItems,null);

private Form form;
// private Form Monitorform;
// private Form menuform;
private TextField userName;
private TextField password;
private ImageItem imageItem;
private Image aImage;

//private List menu = null; // main menu
//private List Choice = null; // list of choices

static final Command exitCommand =new Command("退出",Command.EXIT,1);
static final Command okCommand =new Command("确定",Command.OK,2);
static final Command backCommand = new Command("返回", Command.BACK, 3);
private String currentMenu = null;

public Login()
{
userName=new TextField("用户名 :","",15,TextField.ANY);
password=new TextField("密 码 :","",15,TextField.PASSWORD);

try{
aImage=Image.createImage("/nokia.png");
}
catch(Exception e){ };
imageItem=new ImageItem("\n 请输入用户名和密码： ",aImage,ImageItem.LAYOUT_CENTER,"#?@");

}
public void startApp() throws MIDletStateChangeException
{
display=Display.getDisplay(this);
form=new Form(" 您尚未登录 ...");
form.append(imageItem);
form.append(userName);
form.append(password);
form.addCommand(exitCommand);
form.addCommand(okCommand);
currentMenu="logging";
form.setCommandListener(this);
display.setCurrent(form);

monitor.addCommand(backCommand);
monitor.addCommand(okCommand);
monitor.setCommandListener(this);
query.addCommand(okCommand);
query.addCommand(backCommand);
query.setCommandListener(this);
warning.addCommand(backCommand);
warning.setCommandListener(this);
setting.addCommand(backCommand);
setting.setCommandListener(this);
image.addCommand(backCommand);
image.setCommandListener(this);
group.addCommand(backCommand);
group.setCommandListener(this);
property.addCommand(backCommand);
property.setCommandListener(this);
realtime.addCommand(backCommand);
realtime.setCommandListener(this);
record.addCommand(backCommand);
record.setCommandListener(this);
recordquery.addCommand(backCommand);
recordquery.setCommandListener(this);
realtimequery.addCommand(backCommand);
realtimequery.setCommandListener(this);
manage.addCommand(backCommand);
manage.setCommandListener(this);
infogroup.addCommand(backCommand);
infogroup.setCommandListener(this);

}
public void destroyApp(boolean arg0) throws MIDletStateChangeException {
notifyDestroyed();
}
public void pauseApp()
{
}
public void main() {
//display.setCurrent(mainMenu);
//currentMenu = "Main";
}

public void validateUser(String name, String password) {
if (name.equals("jacky") && password.equals("")) {
menu();
} else {
tryAgain();
}
}
public void menu() {
mainMenu=new List("欢迎使用移动监控系统", List.IMPLICIT,menuItems,null);
mainMenu.addCommand(backCommand);
mainMenu.addCommand(okCommand);
mainMenu.setCommandListener(this);
display.setCurrent(this.mainMenu);
}
public void tryAgain() {
try{
aImage=Image.createImage("/soup.gif");
}
catch(Exception e){ }
Alert error = new Alert("登录失败", "用户名或密码错误，请再试一次", aImage, AlertType.ERROR);
error.setTimeout(Alert.FOREVER);
userName.setString("");
password.setString("");
display.setCurrent(error, form);
}
private Image createImage(String name){
Image cImage = null;
try{
cImage = Image.createImage(name);
}
catch(IOException e){
}
return cImage;
}
public void commandAction(Command c, Displayable s)
{
List list =(List) s;
if(c==List.SELECT_COMMAND){
int index=list.getSelectedIndex();
if(list==this.mainMenu){
switch(index){
case 0: display.setCurrent(this.monitor); break;
case 1: display.setCurrent(this.query); break;
case 2: display.setCurrent(this.warning); break;
case 3: display.setCurrent(this.setting);
} }
else if (list==this.monitor){
switch(index){
case 0: display.setCurrent(this.image); break;
case 1: display.setCurrent(this.group);
} }
else if (list==this.query){
switch(index){
case 0: display.setCurrent(this.property);break;
case 1: display.setCurrent(this.realtime);break;
case 2: display.setCurrent(this.record);
} }
else if(list==this.warning){
switch(index){
case 0: display.setCurrent(this.realtimequery);break;
case 1: display.setCurrent(this.recordquery);
} }
else if(list==this.setting){
switch(index){
case 0: display.setCurrent(this.manage);break;
case 1: display.setCurrent(this.infogroup);

}
}
} else if(c==backCommand){
if (list==this.monitor||list==this.query||list==this.warning||list==this.setting){
display.setCurrent(this.mainMenu); }
else if(list==this.image||list==this.group){
display.setCurrent(this.monitor); }
else if(list==this.property||list==this.realtime||list==this.record){
display.setCurrent(this.query); }
else if(list==this.realtimequery||list==this.recordquery){
display.setCurrent(this.warning); }
else if(list==this.manage||list==this.infogroup){
display.setCurrent(this.setting); }
}

else if(c==exitCommand) {
try{
destroyApp(false);
//notifyDestroyed();
} catch(MIDletStateChangeException e){
e.printStackTrace();
}
}
else if(c==okCommand) {
if(currentMenu=="logging"){
validateUser(userName.getString(), password.getString());
}
//else if(list==mainMenu){
//display.setCurrent(this.monitor);
//} else if (list==monitor)

}
}
}

[traud]

You do a type cast to ‘List’ in the first line of ‘commandAction’ method of your ‘Login’ class.

[jacky521]

yes, i've know that, but now my new problem is

Class File Editor:
Source not found:
The Jar of this classfile belongs to the container 'J2ME library [ Sun Java (TM) Wireless Toolkit 2.5.1 for CLDC/DefaultColorPhone]'which does not allow modifications to source attachments on its entries.

i don't know how to solve it, can anybody help me !
with many thanks