This is about sending mail, so we are talking about a SMTP server

The code

Properties props = new Properties();
if (Integer.parseInt(port) == 465) // SSL
{ 
    props.put("mail.smtp.auth", "true"); 
    props.put("mail.smtp.socketFactory.port", port);
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
    props.put("mail.smtp.socketFactory.fallback", "true"); 
} 
else
{
    props.put("mail.smtp.starttls.enable", "true");
}

Session mailSession = Session.getInstance(props);
mailSession.setDebug(false);
MimeMessage message = new MimeMessage(mailSession);
message.setSubject(subject);
message.setContent(messageString, "text/plain");
message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
message.setFrom(new InternetAddress(recipients));

Transport transport = mailSession.getTransport("smtp");
transport.connect(host, Integer.parseInt(port), username, password);
transport.sendMessage(message, message.getRecipients(Message.RecipientType.TO));
transport.close();

Setting the right parameters

For example with gmail, the settings are :

• Gmail SMTP server address: smtp.gmail.com
• Gmail SMTP user name: Your full Gmail address (e.g. example@gmail.com)
• Gmail SMTP password: Your Gmail password
• Gmail SMTP port (TLS): 587
• Gmail SMTP port (SSL): 465

More reading

The official FAQ is actually great
www.oracle.com/technetwork/java/javamail/faq/index.html

The post Sending mail with java mail javax Mailer encrypted SSL or TLS appeared first on Techy Things.

$> jstack 29812 > ~/threadDump.txt

where 29812 is the PID of java process

Possible problem : Unable to deduce type of thread from address

Deadlock Detection: Can't print deadlocks:Unable to deduce type of thread from address 0x00007ff514019800 (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread, or SurrogateLockerThread)

Please help I do not know how to solve the above !!

The post To produce a thread dump on an unresponsive java process appeared first on Techy Things.

E: Unable to locate package openjdk-7-jre

The steps to install openjdk-7-jre are the following :

• Go into Administration > Software Sources
• Remove (uncheck) all software sources (including CD-ROMs) :
• Add these two software sources :
  • deb http://ftp.us.debian.org/debian/ sid main
  • deb-src http://ftp.us.debian.org/debian/ sid main
• proceed with installation

The post How to install openjdk-7-jre on Debian 6.0.6 or 6.0.7 appeared first on Techy Things.