NoClassDefFoundError JavaMail..........

[karthik mama]

The error when I'm trying to send a mail in my servlet application is...

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/activation/registries/LogSupport
at javax.activation.MailcapCommandMap.<init>(MailcapCommandMap.java:111)
at javax.activation.CommandMap.getDefaultCommandMap(CommandMap.java:44)
at javax.activation.DataHandler.getCommandMap(DataHandler.java:136)
at javax.activation.DataHandler.getDataContentHandler(DataHandler.java:567)
at javax.activation.DataHandler.writeTo(DataHandler.java:294)
at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:230)
at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1065)
at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:1923)
at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:1904)
at javax.mail.Transport.send(Transport.java:79)
at JavaMail.send(JavaMail.java:21)
at JavaMail.main(JavaMail.java:26)


Can anyone please help out.

Regards
Karthik

[karthik mama]

This was the code written....

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*; 
public class JavaMail {
	public static void send(String smtpHost, int smtpPort,String from, String to,String subject, String content)throws AddressException, MessagingException {

		// Create a mail session
		Properties props = new Properties();
		props.put("mail.smtp.host", smtpHost);
		props.put("mail.smtp.port", ""+smtpPort);
		Session session = Session.getDefaultInstance(props, null);

		// Construct the message
		Message msg = new MimeMessage(session);
		msg.setFrom(new InternetAddress(from));
		msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
		msg.setSubject(subject);
		msg.setText(content);

		// Send the message
		Transport.send(msg);
	}

	public static void main(String[] args) throws Exception {
		// Send a test message
		send("localhost", 25, "toEmail", "fromEmail",
				"Hello", "Hello, \n\n How are you ?");
	}

}

[arulk pillai]

Check if you have the Java Activation Framework jar file in your classpath. If not, download and add it to your classpath.

[karthik mama]

hey,

I did add the activation.jar to my class path but still it persists....

[Rob Spoor]

This class should be part of rt.jar from the default JRE installation, at least if you use Java 6 (probably Java 5.0 as well). Which JRE are you using?

[karthik mama]

version 5.0

[karthik mama]

"This class should be part of rt.jar"

I'm using RAD.... so how do i include the activation.jar as part of rt.jar......

If you don't mind could you please explain...

[Ulf Dittmer]

karthik mama wrote:I did add the activation.jar to my class path but still it persists....

How did you add the file, and how are you running this code?

[karthik mama]

Right clicking my project and selecting build path i included the activation.jar files.....this was what i did....

[Rob Spoor]

karthik mama wrote:"This class should be part of rt.jar"

I'm using RAD.... so how do i include the activation.jar as part of rt.jar......

If you don't mind could you please explain...

You don't need to add activation.jar as part of rt.jar. They just have to be both part of the class path; rt.jar usually is by default - if not the JVM can't even find java.lang.Object.


I've just checked a Java 5.0 installation, and it is missing this class inside rt.jar. That's because the activation framework wasn't part of the core API until Java 6. It's inside activation.jar though, so it seems you haven't added it properly to the class path.


How did you run your application when you got this exception? From within RAD, or from the command line? Because the latter requires you to set the class path yourself.

[karthik mama]

I ran it on websphere app server 6.x ....
so you want me to also include rt.jar??

[Rob Spoor]

No, that's already included by default.

Did you add activation.jar to your Websphere class path? Just adding it in RAD is not enough for deploying.

[Paul Clapham]

This looks like a version conflict to me. But Websphere already includes mail.jar and activation.jar in its system classpath (you can confirm this with the "snoop" servlet) so you don't need to put either in your application. And you shouldn't, either. Providing a different version than the one Websphere provides can lead to version conflicts.

[karthik mama]

how to add it to websphere class path by the way??

And after removing mail.jar and activation.jar as you said the errors followed.....

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/SharedByteArrayInputStream
at JavaMail.send(JavaMail.java:14)
at JavaMail.main(JavaMail.java:26)