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How to deal with gmail App password using Javax Mail

My Java Windows app needs to send email and allow the user to specify his/her email account credentials: host, port, username, password. It works when I use my credentials for an account at my hosting service, but not so well when using a Gmail account, as my prospective users might want to do. The problem is Gmail insists on an "App password." So, I follow the Google instructions and create a 16-character App password which Google says has to be used one time only. However, I find that the App password MUST be used for subsequent runs.
Here's a sample program that demonstrates the problem. It will fail if I use that actual password for the Gmail account. It will work after I've created an App/device specific password (16 characters) and used it as the password, as it should. But, I have to use that 16-character password thereafter as well. What am I missing?
public class SendEmailTLS {
// Example 1 from https://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example/
public static void main(String[] args) {
final String username = "me123#gmail.com";
final String password = "mypassword";
Properties prop = new Properties();
prop.put("mail.smtp.host", "smtp.gmail.com");
prop.put("mail.smtp.port", "587");
prop.put("mail.smtp.auth", "true");
prop.put("mail.smtp.starttls.enable", "true"); //TLS
Session session = Session.getInstance(prop,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("me123#gmail.com"));
message.setRecipients(
Message.RecipientType.TO,
InternetAddress.parse("you456#hotmail.com")
);
message.setSubject("Testing Gmail TLS");
message.setText("Dear sir,"
+ "\n\n I'm testing TLS,using port 587");
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
e.printStackTrace();
}
}
}
I want to add that I'm now suspecting that what I'm seeing is the way it's supposed to work. I had been thinking the 16-char App specific pw was a "Salt" kind of thing to protect the Gmail server. I have now read that it's really just an alternative password for my Gmail account. If anyone can confirm or deny this new perspective, I would be grateful.

Proxy authenticator auntenticates HTTP But not HTTPS . Why?

I am using openjdk . For porxy authentication ,I am using Authenticator but for my first Request as HTTPS the authenticators doesn't authenticates and throws error. After connecting through HTTP , HTTPS working fine.
I have tried with setting system property, jdk.http.auth.tunneling.disabledSchemes="" and jdk.http.auth.proxying.disabledSchemes="".
private static void setProxy(String proxyHostName,int proxyport){
proxy=new Proxy(Proxy.Type.HTTP,new InetSocketAddress(proxyHostName,proxyport));
}
private static void setProxy(String proxyHostName,int proxyport,String username,String password){
setProxy(proxyHostName,proxyport);
if (username!=null && password!=null) {
System.setProperty("jdk.http.auth.tunneling.disabledSchemes", "");
System.setProperty("jdk.http.auth.proxying.disabledSchemes", "");
Authenticator authenticator = new Authenticator() {
public PasswordAuthentication getPasswordAuthentication() {
return (new PasswordAuthentication(username, password.toCharArray()));
}
};
Authenticator.setDefault(authenticator);
}
}

After setting this property in my java_opts in .sh file . It worked fine for me.
Orelse Anyone want to set in their java code means set it in start method.

Reading HTTPS page with username/password authentication and ignore certifiacte

I need to read some data from HTTPS page that has a local certificate and requires a username/password authentication.
Using "HttpURLConnection", is it possible to do username/password authentication and import the local certificate or ignore it?
Many Thanks,

try to use this. Work for me.
private void authenticadorRedeTendencia() {
Authenticator.setDefault(new Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(userName(), password.toCharArray());
}
});
}

How do I retrieve credential passed by user in soap wsdl Java Webservice

I am sending my credentials using,
Authenticator.setDefault(new Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("username", "password".toCharArray());
}
});
My question is now how can I retrieve this credentials in Soap webservice Java?

Got solution,
ArrayList<String> authList = (ArrayList<String>) http_headers.get("Authorization");
It returns Credentials in Base64.

Dropbox Java: Use Proxy with authentication

I want to create my DbxRequestConfig Object with a StandardHttpRequestor, because I need it to use a Proxy.
The Proxy is a http Proxy, Port 80, and needs authentication.
Proxyaddress: http://myproxy.com
Proxyport: 80
Proxyusername: username
Proxypassword: password
So I tried to use the global Java Proxy setup:
System.setProperty("http.proxy","proxyaddress") //... http.proxyUser, http.ProxyPassword
//and so on
It did not work.
After looking into the StandardHttpRequestor I realized I need to use this Object as well as a Proyx Object:
Proxy proxy = new Proxy(Proxy.Type.HTTP,new InetSocketAddress(ip,port));
StandardHttpRequestor requ = new StandardHttpRequestor(proxy);
Which is wrong, because it has no authentication.
For authentication, the net and google show me the following. Putting all together, my current code looks like the following:
String ip = "http://myproxy.com";
int port = 80;
final String authUser = "username";
final String authPassword = "password";
Authenticator.setDefault(new Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(authUser, authPassword.toCharArray());
}
});
System.setProperty("http.proxyUser", authUser);
System.setProperty("http.proxyPassword", authPassword);
Proxy proxy = new Proxy(Proxy.Type.HTTP,new InetSocketAddress(ip,port));
StandardHttpRequestor requ = new StandardHttpRequestor(proxy);
return requ;
But this does not work as well.
What am I doing wrong?
I can't seem to get the Proxy to work.

One problem was the http:// in String ip = "http://myproxy.com";
My current code looks the following, and works sometimes. Sometimes not. I have no idea why. Sometimes I have to reallow the App to be connected to my DropBox Account, because the authKey doesn't come through the proxy...
Well at least I got an example working for you guys having the same trouble. Maybe the rest of the problem is on the proxy side? I'll have a further look into this. But here comes my code:
public HttpRequestor getProxy(){
if("true".equals(config.getProperty("proxy","false"))){
String ip = "proxy.myproxy.com";
int port = 80;
final String authUser = "username";
final String authPassword = "password";
Authenticator.setDefault(new Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(authUser, authPassword.toCharArray());
}
});
Proxy proxy = new Proxy(Proxy.Type.HTTP,new InetSocketAddress(ip,port));
HttpRequestor req = new StandardHttpRequestor(proxy);
return req;
}
return null;
}
As you can see I don't use the StandardHttpRequestor anymore. For the Dropbox code it is the following:
HttpRequestor requ = con.getProxy();
if(requ!=null)
config = new DbxRequestConfig(APP_NAME, Locale.getDefault().toString(),requ);
else
config = new DbxRequestConfig(APP_NAME, Locale.getDefault().toString());
As I already said, sometimes it works. Sometimes not. I'm going to write more info about that as soon as I know if it's because of the code or because of the proxy itself.