How can i deal with java.security.AccessControlException?

Hi all, I need to implement JavaMail using Servlet and deploy throught J2EE deployment tool. But when i test out the servlet i will always encounter this exception thrown. How can i solve this?
java.security.AccessControlException: access denied (java.util.PropertyPermission * read,write)
This is the servlet i am testing. Please advise. Thanks in advance!
* @(#)JavaMailServlet.java 1.3 99/12/06
* Copyright 1998, 1999 Sun Microsystems, Inc. All Rights Reserved.
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
import java.io.*;
import java.util.*;
import java.text.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
* This is a servlet that demonstrates the use of JavaMail APIs
* in a 3-tier application. It allows the user to login to an
* IMAP store, list all the messages in the INBOX folder, view
* selected messages, compose and send a message, and logout.
* 
* Please note: This is NOT an example of how to write servlets!
* This is simply to show that JavaMail can be used in a servlet.
* 
* For more information on this servlet, see the
* JavaMailServlet.README.txt file.
* 
* For more information on servlets, see
* * http://java.sun.com/products/java-server/servlets/index.html
* @author Max Spivak
public class JavaMailServlet extends HttpServlet implements SingleThreadModel {
String protocol = "POP3";
String mbox = "INBOX";
* This method handles the "POST" submission from two forms: the
* login form and the message compose form. The login form has the
* following parameters: <code>hostname</code>, <code>username</code>,
* and <code>password</code>. The <code>send</code> parameter denotes
* that the method is processing the compose form submission.
public void doPost(HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException {
// get the session
 HttpSession ssn = req.getSession(true);
 String send = req.getParameter("send");
String host = req.getParameter("hostname");
String user = req.getParameter("username");
String passwd = req.getParameter("password");
URLName url = new URLName(protocol, host, -1, mbox, user, passwd);
ServletOutputStream out = res.getOutputStream();
 res.setContentType("text/html");
 out.println("<html><body bgcolor=\"#CCCCFF\">");
 if (send != null) {
 // process message sending
 send(req, res, out, ssn);
 } else {
 // initial login
 // create
 MailUserData mud = new MailUserData(url);
 ssn.putValue("javamailservlet", mud);
 try {
 Properties props = System.getProperties();
 System.out.println("url");
 props.put("mail.smtp.host", host);
 Session session = Session.getDefaultInstance(props, null);
 session.setDebug(false);
 Store store = session.getStore(url);
 store.connect();
 Folder folder = store.getDefaultFolder();
 if (folder == null)
 throw new MessagingException("No default folder");
 folder = folder.getFolder(mbox);
 if (folder == null)
 throw new MessagingException("Invalid folder");
 folder.open(Folder.READ_WRITE);
 int totalMessages = folder.getMessageCount();
 Message[] msgs = folder.getMessages();
 FetchProfile fp = new FetchProfile();
 fp.add(FetchProfile.Item.ENVELOPE);
 folder.fetch(msgs, fp);
 // track who logged in
 System.out.println("Login from: " + store.getURLName());
 // save stuff into MUD
 mud.setSession(session);
 mud.setStore(store);
 mud.setFolder(folder);
 // splash
 out.print("<center>");
 out.print("");
 out.println("Welcome to JavaMail!</center>");
 // folder table
 out.println("<table width=\"50%\" border=0 align=center>");
 // folder name column header
 out.print("<tr><td width=\"75%\" bgcolor=\"#ffffcc\">");
 out.print("");
 out.println("FolderName</td> ");
 // msg count column header
 out.print("<td width=\"25%\" bgcolor=\"#ffffcc\">");
 out.print("");
 out.println("Messages</td> ");
 out.println("</tr>");
 // folder name
 out.print("<tr><td width=\"75%\" bgcolor=\"#ffffff\">");
 out.print("<a href=\"" + HttpUtils.getRequestURL(req) + "\">" +
 "Inbox" + "</a></td> ");
 // msg count
 out.println("<td width=\"25%\" bgcolor=\"#ffffff\">" +
 totalMessages + "</td>");
 out.println("</tr>");
 out.println("</table");
 } catch (Exception ex) {
 out.println(ex.toString());
 } finally {
 out.println("</body></html>");
 out.close();
* This method handles the GET requests for the client.
public void doGet (HttpServletRequest req, HttpServletResponse res)
 throws ServletException, IOException {
HttpSession ses = req.getSession(false); // before we write to out
ServletOutputStream out = res.getOutputStream();
 MailUserData mud = getMUD(ses);
 if (mud == null) {
 res.setContentType("text/html");
 out.println("<html><body>Please Login (no session)</body></html>");
 out.close();
 return;
 if (!mud.getStore().isConnected()) {
 res.setContentType("text/html");
 out.println("<html><body>Not Connected To Store</body></html>");
 out.close();
 return;
 // mux that takes a GET request, based on parameters figures
 // out what it should do, and routes it to the
 // appropriate method
 // get url parameters
 String msgStr = req.getParameter("message");
String logout = req.getParameter("logout");
 String compose = req.getParameter("compose");
 String part = req.getParameter("part");
 int msgNum = -1;
 int partNum = -1;
 // process url params
 if (msgStr != null) {
 // operate on message "msgStr"
 msgNum = Integer.parseInt(msgStr);
 if (part == null) {
 // display message "msgStr"
res.setContentType("text/html");
 displayMessage(mud, req, out, msgNum);
 } else if (part != null) {
 // display part "part" in message "msgStr"
 partNum = Integer.parseInt(part);
displayPart(mud, msgNum, partNum, out, res);
 } else if (compose != null) {
 // display compose form
 compose(mud, res, out);
} else if (logout != null) {
 // process logout
try {
mud.getFolder().close(false);
mud.getStore().close();
 ses.invalidate();
out.println("<html><body>Logged out OK</body></html>");
} catch (MessagingException mex) {
out.println(mex.toString());
 } else {
 // display headers
 displayHeaders(mud, req, out);
/* main method to display messages */
private void displayMessage(MailUserData mud, HttpServletRequest req,
 ServletOutputStream out, int msgNum)
 throws IOException {
 out.println("<html>");
out.println("<HEAD><TITLE>JavaMail Servlet</TITLE></HEAD>");
 out.println("<BODY bgcolor=\"#ccccff\">");
 out.print("<center>");
 out.println("Message " + (msgNum+1) + " in folder " +
 mud.getStore().getURLName() +
 "/INBOX</center>");
 try {
 Message msg = mud.getFolder().getMessage(msgNum);
 // first, display this message's headers
 displayMessageHeaders(mud, msg, out);
 // and now, handle the content
 Object o = msg.getContent();
 //if (o instanceof String) {
 if (msg.isMimeType("text/plain")) {
 out.println("<pre>");
 out.println((String)o);
 out.println("</pre>");
 //} else if (o instanceof Multipart){
 } else if (msg.isMimeType("multipart/*")) {
 Multipart mp = (Multipart)o;
 int cnt = mp.getCount();
 for (int i = 0; i < cnt; i++) {
 displayPart(mud, msgNum, mp.getBodyPart(i), i, req, out);
 } else {
 out.println(msg.getContentType());
 } catch (MessagingException mex) {
 out.println(mex.toString());
 out.println("</BODY></html>");
 out.close();
* This method displays a message part. <code>text/plain</code>
* content parts are displayed inline. For all other parts,
* a URL is generated and displayed; clicking on the URL
* brings up the part in a separate page.
private void displayPart(MailUserData mud, int msgNum, Part part,
 int partNum, HttpServletRequest req,
 ServletOutputStream out)
 throws IOException {
 if (partNum != 0)
 out.println("<hr>");
try {
 String sct = part.getContentType();
 if (sct == null) {
 out.println("invalid part");
 return;
 ContentType ct = new ContentType(sct);
 if (partNum != 0)
 out.println("Attachment Type: " +
 ct.getBaseType() + " ");
 if (ct.match("text/plain")) {
 // display text/plain inline
 out.println("<pre>");
 out.println((String)part.getContent());
 out.println("</pre>");
 } else {
 // generate a url for this part
 String s;
 if ((s = part.getFileName()) != null)
 out.println("Filename: " + s + " ");
 s = null;
 if ((s = part.getDescription()) != null)
 out.println("Description: " + s + " ");
 out.println("<a href=\"" +
 HttpUtils.getRequestURL(req) +
 "?message=" +
 msgNum + "&part=" +
 partNum + "\">Display Attachment</a>");
 } catch (MessagingException mex) {
 out.println(mex.toString());
* This method gets the stream from for a given msg part and
* pushes it out to the browser with the correct content type.
* Used to display attachments and relies on the browser's
* content handling capabilities.
private void displayPart(MailUserData mud, int msgNum,
 int partNum, ServletOutputStream out,
 HttpServletResponse res)
 throws IOException {
 Part part = null;
try {
 Message msg = mud.getFolder().getMessage(msgNum);
 Multipart mp = (Multipart)msg.getContent();
 part = mp.getBodyPart(partNum);
 String sct = part.getContentType();
 if (sct == null) {
 out.println("invalid part");
 return;
 ContentType ct = new ContentType(sct);
 res.setContentType(ct.getBaseType());
 InputStream is = part.getInputStream();
 int i;
 while ((i = is.read()) != -1)
 out.write(i);
 out.flush();
 out.close();
 } catch (MessagingException mex) {
 out.println(mex.toString());
* This is a utility message that pretty-prints the message
* headers for message that is being displayed.
private void displayMessageHeaders(MailUserData mud, Message msg,
 ServletOutputStream out)
 throws IOException {
 try {
 out.println("Date: " + msg.getSentDate() + " ");
Address[] fr = msg.getFrom();
if (fr != null) {
boolean tf = true;
out.print("From: ");
for (int i = 0; i < fr.length; i++) {
out.print(((tf) ? " " : ", ") + getDisplayAddress(fr));
tf = false;
out.println(" ");
Address[] to = msg.getRecipients(Message.RecipientType.TO);
if (to != null) {
boolean tf = true;
out.print("To: ");
for (int i = 0; i < to.length; i++) {
out.print(((tf) ? " " : ", ") + getDisplayAddress(to[i]));
tf = false;
out.println(" ");
Address[] cc = msg.getRecipients(Message.RecipientType.CC);
if (cc != null) {
boolean cf = true;
out.print("CC: ");
for (int i = 0; i < cc.length; i++) {
out.print(((cf) ? " " : ", ") + getDisplayAddress(cc[i]));
 cf = false;
out.println(" ");
 out.print("Subject: " +
 ((msg.getSubject() !=null) ? msg.getSubject() : "") +
 " ");
} catch (MessagingException mex) {
 out.println(msg.toString());
* This method displays the URL's for the available commands and the
* INBOX headerlist
private void displayHeaders(MailUserData mud,
 HttpServletRequest req,
ServletOutputStream out)
 throws IOException {
SimpleDateFormat df = new SimpleDateFormat("EE M/d/yy");
out.println("<html>");
out.println("<HEAD><TITLE>JavaMail Servlet</TITLE></HEAD>");
 out.println("<BODY bgcolor=\"#ccccff\"><hr>");
 out.print("<center>");
 out.println("Folder " + mud.getStore().getURLName() +
 "/INBOX</center>");
 // URL's for the commands that are available
 out.println("");
out.println("<a href=\"" +
 HttpUtils.getRequestURL(req) +
 "?logout=true\">Logout</a>");
out.println("<a href=\"" +
 HttpUtils.getRequestURL(req) +
 "?compose=true\" target=\"compose\">Compose</a>");
 out.println("");
 out.println("<hr>");
 // List headers in a table
out.print("<table cellpadding=1 cellspacing=1 "); // table
 out.println("width=\"100%\" border=1>"); // settings
 // sender column header
 out.println("<tr><td width=\"25%\" bgcolor=\"ffffcc\">");
 out.println("");
 out.println("Sender</td>");
 // date column header
 out.println("<td width=\"15%\" bgcolor=\"ffffcc\">");
 out.println("");
 out.println("Date</td>");
 // subject column header
 out.println("<td bgcolor=\"ffffcc\">");
 out.println("");
 out.println("Subject</td></tr>");
 try {
 Folder f = mud.getFolder();
 int msgCount = f.getMessageCount();
 Message m = null;
 // for each message, show its headers
 for (int i = 1; i <= msgCount; i++) {
m = f.getMessage(i);
 // if message has the DELETED flag set, don't display it
 if (m.isSet(Flags.Flag.DELETED))
 continue;
 // from
out.println("<tr valigh=middle>");
out.print("<td width=\"25%\" bgcolor=\"ffffff\">");
 out.println("" +
 ((m.getFrom() != null) ?
 m.getFrom()[0].toString() :
 "" ) +
 "</td>");
 // date
out.print("<td nowrap width=\"15%\" bgcolor=\"ffffff\">");
 out.println("" +
df.format((m.getSentDate()!=null) ?
 m.getSentDate() : m.getReceivedDate()) +
 "</td>");
 // subject & link
out.print("<td bgcolor=\"ffffff\">");
 out.println("" +
 "<a href=\"" +
 HttpUtils.getRequestURL(req) +
"?message=" +
i + "\">" +
((m.getSubject() != null) ?
 m.getSubject() :
 "No Subject") +
"</a>" +
"</td>");
out.println("</tr>");
 } catch (MessagingException mex) {
 out.println("<tr><td>" + mex.toString() + "</td></tr>");
 mex.printStackTrace();
 out.println("</table>");
 out.println("</BODY></html>");
 out.flush();
 out.close();
* This method handles the request when the user hits the
* Compose link. It send the compose form to the browser.
private void compose(MailUserData mud, HttpServletResponse res,
 ServletOutputStream out)
 throws IOException {
 res.setContentType("text/html");
 out.println(composeForm);
 out.close();
* This method processes the send request from the compose form
private void send(HttpServletRequest req, HttpServletResponse res,
 ServletOutputStream out, HttpSession ssn)
 throws IOException {
String to = req.getParameter("to");
 String cc = req.getParameter("cc");
 String subj = req.getParameter("subject");
 String text = req.getParameter("text");
 try {
 MailUserData mud = getMUD(ssn);
 if (mud == null)
 throw new Exception("trying to send, but not logged in");
 Message msg = new MimeMessage(mud.getSession());
 InternetAddress[] toAddrs = null, ccAddrs = null;
 if (to != null) {
 toAddrs = InternetAddress.parse(to, false);
 msg.setRecipients(Message.RecipientType.TO, toAddrs);
 } else
 throw new MessagingException("No \"To\" address specified");
 if (cc != null) {
 ccAddrs = InternetAddress.parse(cc, false);
 msg.setRecipients(Message.RecipientType.CC, ccAddrs);
 if (subj != null)
 msg.setSubject(subj);
 URLName u = mud.getURLName();
 msg.setFrom(new InternetAddress(u.getUsername() + "@" +
 u.getHost()));
 if (text != null)
 msg.setText(text);
 Transport.send(msg);
 out.println("<h1>Message sent successfully</h1></body></html>");
 out.close();
 } catch (Exception mex) {
 out.println("<h1>Error sending message.</h1>");
 out.println(mex.toString());
 out.println(" </body></html>");
// utility method; returns a string suitable for msg header display
private String getDisplayAddress(Address a) {
String pers = null;
String addr = null;
if (a instanceof InternetAddress &&
((pers = ((InternetAddress)a).getPersonal()) != null)) {
 addr = pers + " "+"<"+((InternetAddress)a).getAddress()+">";
} else
addr = a.toString();
return addr;
// utility method; retrieve the MailUserData
// from the HttpSession and return it
private MailUserData getMUD(HttpSession ses) throws IOException {
 MailUserData mud = null;
 if (ses == null) {
 return null;
 } else {
 if ((mud = (MailUserData)ses.getValue("javamailservlet")) == null){
 return null;
 return mud;
public String getServletInfo() {
return "A mail reader servlet";
* This is the HTML code for the compose form. Another option would
* have been to use a separate html page.
private static String composeForm = "<HTML><HEAD><TITLE>JavaMail Compose</TITLE></HEAD><BODY BGCOLOR=\"#CCCCFF\"><FORM ACTION=\"/servlet/JavaMailServlet\" METHOD=\"POST\"><input type=\"hidden\" name=\"send\" value=\"send\">JavaMail Compose Message<TABLE BORDER=\"0\" WIDTH=\"100%\"><TR><TD WIDTH=\"16%\" HEIGHT=\"22\"> To:</TD><TD WIDTH=\"84%\" HEIGHT=\"22\"><INPUT TYPE=\"TEXT\" NAME=\"to\" SIZE=\"30\"> (separate addresses with commas)</TD></TR><TR><TD WIDTH=\"16%\">CC:</TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"cc\" SIZE=\"30\"> (separate addresses with commas)</TD></TR><TR><TD WIDTH=\"16%\">Subject:</TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"subject\" SIZE=\"55\"></TD></TR><TR><TD WIDTH=\"16%\"> </TD><TD WIDTH=\"84%\"><TEXTAREA NAME=\"text\" ROWS=\"15\" COLS=\"53\"></TEXTAREA></TD></TR><TR><TD WIDTH=\"16%\" HEIGHT=\"32\"> </TD><TD WIDTH=\"84%\" HEIGHT=\"32\"><INPUT TYPE=\"SUBMIT\" NAME=\"Send\" VALUE=\"Send\"><INPUT TYPE=\"RESET\" NAME=\"Reset\" VALUE=\"Reset\"></TD></TR></TABLE></FORM></BODY></HTML>";
* This class is used to store session data for each user's session. It
* is stored in the HttpSession.
class MailUserData {
URLName url;
Session session;
Store store;
Folder folder;
public MailUserData(URLName urlname) {
 url = urlname;
public URLName getURLName() {
 return url;
public Session getSession() {
 return session;
public void setSession(Session s) {
 session = s;
public Store getStore() {
 return store;
public void setStore(Store s) {
 store = s;
public Folder getFolder() {
 return folder;
public void setFolder(Folder f) {
 folder = f;

You posted a thousand lines of badly-formatted code and didn't have the sense to say which one had the exception.
My guess is that it was this one:Session session = Session.getDefaultInstance(props, null);because that happened to me. I fixed it by calling getInstance instead of getDefaultInstance.
However if that isn't the problem, how about spending a few seconds to post a less useless question?

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import javax.swing.border.*;
import java.awt.event.*;
import javax.swing.BoxLayout.*;
import java.text.*;
import java.util.*;
public class gender1 extends JFrame implements ActionListener
JPanel buttonpanel=new JPanel(),
private JPanel mainpanel=new JPanel(new BorderLayout());
private JButton Submit=new JButton("SUBMIT");
private JButton Update=new JButton("Update");
private JRadioButton gender[]=new JRadioButton[genderOptions];
private String genderlabels[]={"female","male"};
private JTextField malefield=new JTextField(10),
femalefield=new JTextField(10);
public gender1()
 this.getContentPane().setLayout(new BorderLayout());
 updatetotal();
 initGender();
public void updatetotal()
//adding buttons and actionlisteners
lpanel.add(Update);
Update.addActionListener(this);
lpanel.add(Submit);
Submit.addActionListener(this);
//adding textfileds for totals
lpanel.add(totmale);
lpanel.add(totfemale);
mainpanel.add(lpanel,"Center");
public void initGender()
buttonpanel.setBackground(Color.red.darker());
 buttonpanel.setLayout(new BoxLayout(buttonpanel,BoxLayout.X_AXIS));
 for (int k = 0;k < genderOptions;k++)
 gender[k]=new JRadioButton(genderlabels[k]);
buttonpanel.add(gender[k]);
optGroup1.add(gender[k]);
 mainpanel.add(buttonpanel);
 gender[0].setSelected(true);
//get teh one button which is selected
gender[].addActionlistener(this);
public void actionPerformed(ActionEvent e)
if (e.getSource==Update)
if(gender[].getSelected()=="male")
int mtot,ftot=0
mtot=tot+1;
 int maletotal=maletotal+mtot;
else
ftot=ftot+1;
int femaletotal=femaletotal+ftot;
femalefield=totfemale.setText(femaletotal);
malefield=totmale.setText(maletotal);
if(e.getSource==submit)
DataOutputStream dos=new DataOutputStream(FileOutputStream(gen))
dos.writeInt(maletotal);
dos.writeInt(femaletotal);
public static void main(String s[])
gender c=new gender();
c.setSize(800,600);
c.setVisible(true);
c.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{ System.exit(0);
Is this the way to deal it?????

I use something like this in one of my GUI's
boolean female = false;
add a listener to the radio buttons and toggle the flag between true and false;
set the radio button to male as selected or female which ever is pc at the moment.
Jim

How can I deal with the "throw exception"?

A function has the following definition:
import javax.naming.NamingException;
public BinRelation readBinRelation() throws BadInputDataException,IOException
When I use this function as follows:
BinRelation binRel;
binRel = readBinRelation();
then comes the error:
unreported exception javax.naming.NamingException; must be caught or declared to be thrown.
So how can use this function correctly?
Thanks

So how can use this function correctly?By learning what exceptions are, how they're used, and what you can do to deal with them. There's a tutorial here: http://java.sun.com/docs/books/tutorial/essential/exceptions/index.htmlAnd here's a quick overview:
The base class for all exceptions is Throwable. Java provides Exception and Error that extend Throwable. RuntimeException (and many others) extend Exception.
RuntimeException and its descendants, and Error and its descendants, are called unchecked exceptions. Everything else is a checked exception.
If your method, or any method it calls, can throw a checked exception, then your method must either catch that exception, or declare that your method throws that exception. This way, when I call your method, I know at compile time what can possibly go wrong and I can decide whether to handle it or just bubble it up to my caller. Catching a given exception also catches all that exception's descendants. Declaring that you throw a given exception means that you might throw that exception or any of its descendants.
Unchecked exceptions (RuntimeException, Error, and their descendants) are not subject to those restrictions. Any method can throw any unchecked exception at any time without declaring it. This is because unchecked exceptions are either the sign of a coding error (RuntimeException), which is totally preventable and should be fixed rather than handled by the code that encounters it, or a problem in the VM, which in general can not be predicted or handled.

My speaker doesn't work, how can I deal with it?

Hey, my speaker haven't worked for a month, and I am wondering how I can deal with it?

Hi there sugardeer,
I would recommend taking a look at the troubleshooting steps found in the article below.
iPhone: Can't hear through the receiver or speakers
http://support.apple.com/kb/TS1630
-Griff W.

How can i deal with this problem

For example, In my database, there are three records:
field : a b c
a.txt c:/a.txt adsfs
b.txt c:/b.txt asdfsf
c.txt c:/c.txt asfdsf
Now I open one file b.txt to check the database whether have the same filename,filepath, hash value.
the results display:
The file: b.txt has not been registered
The file: c://b.txt appears OK
The file: b.txt has not been registered
I want to do is to only shows the results of 'The file: c://b.txt appears OK'. I know the problem is the body of while(rs.next).
is there any best way to conform to my demand
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:MD5";
Connection connection=DriverManager.getConnection(url);
Statement statement = connection.createStatement();
String sql="SELECT * FROM MD5";
ResultSet rs = statement.executeQuery(sql);
while (rs.next()) {
if (file.getName().equals(rs.getString("a")))
if (file.getPath().equals(rs.getString("b")))
if (m.equals(rs.getString("c")))
jTextArea2.append("The file: " + file.getPath() +"appears OK"+"\n");
else jTextArea2.append("The file: " + file.getPath() +"has been modified"+"\n");
else jTextArea2.append("The Path for the" + file.getName() +"has been modified"+"\n");
else jTextArea2.append("The file: " + file.getName() +"has not been registered"+"\n");
rs.close();
connection.close();
}

Why not add a WHERE clause to your statment to filter records having the name of the file in the first record. In this case you'd better use PreparedStatement and set the file name as statement parameter
Because now you loop through the entire table for a thing you can deal with at DB level.
And I agree with the others' remarks about those braces ;)
Mike

I need to reset my security questions because it says the answers I provided are not correct. How can I reset with new security questions and answers

I need to reset my security questions and answers. But nit is saying my birthday for a verification is invaid. How can I reset all of this?

You need to ask Apple to reset your security questions; ways of contacting them include clicking here and picking a method for your country, phoning AppleCare and asking for the Account Security team, and filling out and submitting this form.
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