Sending multiple attachment files with javamail

[Bill Melendez]

The below code sends 1 attachment to a recipient. However, I need to send 3 files to the recipient. This is my first attempt at using JavaMail and the am finding difficulty resolving the "multipart" section to accept 3 files. The issue is that while each file is selected and each multipart is there, the last portion of the multipart (multipart3 and multipart4) is not added to the message. If  I comment out the last two (multipart3 and multipart4) lines of the msg.setContent, then the message goes through with the first attachment. Really could use some help in this.

public void sendEMAIL() throws UnsupportedEncodingException, IOException{
        
        
     ArrayList<String> fileNames = new ArrayList<>(4);
    //Make the arraylist size of 3 match array capacity of 4
     for (int i = 0; i <= 4; i++) {
    fileNames.add("C:\\Users\\wmelendez\\Documents\\NetBeansProjects\\PlumbPRO\\Plumb-13052021.docx");
    fileNames.add("C:\\Users\\wmelendez\\Documents\\NetBeansProjects\\PlumbPRO\\Plumb-13052021.xlsx");
    fileNames.add("C:\\Users\\wmelendez\\Documents\\NetBeansProjects\\PlumbPRO\\Plumb2-13052021.xlsx");
     }//end of for loop
     
  
   
    user = jtxtfld_USER.getText();
    emailPSWD = new String(this.jtxtfld_PASSWD1.getPassword());
    emailTO = jtxtfld_TO.getText();
    emailCC = jtxtfld_CC.getText();
    Date date = new Date();
    emailDATE = date.toString();
    emailFROM = jtxtfld_FROM.getText();
    emailBCC = "     ";
    
    
    
    Properties props = new Properties();  
     Session session = Session.getDefaultInstance(props,new javax.mail.Authenticator() {  
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {  
      return new PasswordAuthentication(user,emailPSWD);   }  
    });     
     String Host = "smtp.gmail.com";
         
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", Host);//gmail host
      props.put("mail.smtp.port", "465");//587,993
      props.put("mail.smtp.ssl.enable", "true"); 
      props.setProperty("mail.user", user);
      props.setProperty("mail.password", emailPSWD);
      props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");  
    

session.setDebug(true);

try {
    String txtMSG = jtxtarea_MESSAGE.getText();
   
    
    MimeMessage msg = new MimeMessage(session);
   
    msg.setFrom(new InternetAddress (user));
    msg.addRecipient(Message.RecipientType.TO, new InternetAddress(emailTO));
    msg.addRecipient(RecipientType.CC, new InternetAddress(emailCC));
   // msg.addRecipient(RecipientType.BCC, new InternetAddress(emailBCC));
    msg.setSubject("Report "+ date +" ");
    msg.setSentDate(new Date());
    msg.setText(txtMSG);
    
          //*************************
   
          // create MimeBodyPart object and set your message content    
         MimeBodyPart messageBodyPart = new MimeBodyPart();
         messageBodyPart.setContent(txtMSG, "text/html");

                
           // create new MimeBodyPart object and set DataHandler object to this object  
        int i=0;

        //Create 1st attachment Multipart
        MimeBodyPart messageBodyPart2 = new MimeBodyPart(); 
        DataSource source1 = new FileDataSource((String)fileNames.get(i));
        messageBodyPart2.setDataHandler(new DataHandler(source1));
        messageBodyPart2.setFileName((String)fileNames.get(i));
        System.out.println(fileNames.get(i));
        
        //Create 2nd attachment Multipart   
        i=i+1;
        MimeBodyPart messageBodyPart3 = new MimeBodyPart(); 
        DataSource source2 = new FileDataSource((String)fileNames.get(i));
        messageBodyPart3.setDataHandler(new DataHandler(source2));
        messageBodyPart3.setFileName((String)fileNames.get(i));
        System.out.println(fileNames.get(i));
        
        //Create 3rd attachment Multipart 
        i=i+1;
        MimeBodyPart messageBodyPart4 = new MimeBodyPart(); 
        DataSource source3 = new FileDataSource((String)fileNames.get(i));
        messageBodyPart3.setDataHandler(new DataHandler(source3));
        messageBodyPart3.setFileName((String)fileNames.get(i));     
        System.out.println(fileNames.get(i));
        
      
     //create Multipart object and add MimeBodyPart objects to this object      
        Multipart multipart = new MimeMultipart(); 
        multipart.addBodyPart(messageBodyPart);  
        
       
        Multipart multipart2 = new MimeMultipart(); 
        multipart2.addBodyPart(messageBodyPart2);
        System.out.println(multipart2);
        
        Multipart multipart3 = new MimeMultipart();
        multipart3.addBodyPart(messageBodyPart3);
        System.out.println(multipart3);
        
        Multipart multipart4 = new MimeMultipart();
        multipart4.addBodyPart(messageBodyPart4);
        System.out.println(multipart4);
     
         //set the multiplart object to the message object 
         msg.setContent(multipart);
         msg.setContent(multipart2);
         msg.setContent(multipart3);
        // msg.setContent(multipart4);
     
    //********SEND MESSAGE********
    Transport transport = session.getTransport("smtps");
    transport.connect(Host,465, user, emailPSWD);
    transport.sendMessage(msg, msg.getAllRecipients());
    transport.close();
   
            
    System.out.println("Sent Ok");
    } catch (MessagingException e) {throw new RuntimeException(e);}
  
   }    

[Paul Clapham]

It's been a long, long time since I wrote JavaMail code. But let me take a try:

     //create Multipart object and add MimeBodyPart objects to this object    

Yes. That sounds like a good idea. But your subsequent code doesn't do that. Instead it creates several Multipart objects, and adds one MimeBodyPart object to each of them. I'd guess that using only one Multipart object would be a better strategy.

But just to be sure, since it's been well over a decade since I did this, I spent a moment to track down a tutorial. And yes, I'm right. Here's the tutorial: Sending Emails with Attachments in Java.

[Bill Melendez]

Paul:

Thank you so much for your willingness to help me with this. I redid the multipart section to reduce some of the clutter and am still getting just one attachment being sent. I read your tutorial and it helped me reduce all the excess code lines. However, I still can't seem to attach the 2nd and 3rd file attachments. It attaches the first file with no problem and sends the email to the recipient. Below are the multipart changes I made.  I use System print to verify that the file selection and the attachment part were not empty. Both seem to be working okay. I'm just missing something in my code to tell the multipart that it needs to recognize each file independently and keep them as attachments.

 // create MimeBodyPart object and set your message content    
         MimeBodyPart messageBodyPart = new MimeBodyPart();
         messageBodyPart.setContent(txtMSG, "text/html");

         for (int i=0; i<4;i++) {
          MimeBodyPart attachmentPart = new MimeBodyPart(); 
          attachmentPart.attachFile(new File(fileNames.get(i)));
          
          System.out.println(attachmentPart);
          System.out.println(fileNames.get(i));   
          
          //set the Multipart
       
          Multipart multipart = new MimeMultipart();
          multipart.addBodyPart(messageBodyPart);
          multipart.addBodyPart(attachmentPart);
        
        
        
        //set the multiplart object to the message object 
         msg.setContent(multipart);
         }
    

[Ron McLeod]

I took your code, removed bits which didn't seem like they were part of the problem, and created a couple of methods to reduce repeated code.

This example does work - maybe you can use it to help debug your code.

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.file.Paths;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class EmailTest {
	public static void main(String[] args) throws Exception {
		new EmailTest().sendEMAIL();
	}

	public void sendEMAIL() throws UnsupportedEncodingException, IOException, MessagingException {
		String user = "**********@gmail.com";
		String password = "**********";
		String emailTo = "**********@gmail.com";
		String host = "smtp.gmail.com";
		String filesLocation = "C:\\Users\\Ron\\Documents";

		Properties props = new Properties();
		props.put("mail.smtp.auth", "true");
		props.put("mail.smtp.starttls.enable", "true");
		props.put("mail.smtp.host", host);
		props.put("mail.smtp.port", "465");
		props.put("mail.smtp.ssl.enable", "true");

		Session session = Session.getInstance(props, new javax.mail.Authenticator() {
			protected PasswordAuthentication getPasswordAuthentication() {
				return new PasswordAuthentication(user, password);
			}
		});

		MimeMessage msg = new MimeMessage(session);
		msg.setFrom(new InternetAddress(user));
		msg.addRecipient(RecipientType.TO, new InternetAddress(emailTo));
		msg.setSubject("Email with attachements");

		MimeMultipart multipart = new MimeMultipart();
		msg.setContent(multipart);
		
		MimeBodyPart messageBodyPart1 = createTextPart("This is my message", "text/html");
		multipart.addBodyPart(messageBodyPart1);

		MimeBodyPart messageBodyPart2 = createBinaryPart(filesLocation, "capture.pcap", "application/octet-stream");
		multipart.addBodyPart(messageBodyPart2);

		MimeBodyPart messageBodyPart3 = createBinaryPart(filesLocation, "scratch card.pdf", "application/pdf");
		multipart.addBodyPart(messageBodyPart3);

		MimeBodyPart messageBodyPart4 = createBinaryPart(filesLocation, "dog.png", "image/png");
		multipart.addBodyPart(messageBodyPart4);

		//********SEND MESSAGE********
		Transport.send(msg);

		System.out.println("Sent Ok");
	}

	private MimeBodyPart createTextPart(String text, String mimeType) throws MessagingException {
		MimeBodyPart messageBodyPart = new MimeBodyPart();
		messageBodyPart.setContent(text, mimeType);
		return messageBodyPart;
	}

	private MimeBodyPart createBinaryPart(String path, String name, String mimeType) throws MessagingException {
		MimeBodyPart messageBodyPart = new MimeBodyPart();
		FileDataSource source = new FileDataSource(Paths.get(path, name).toFile());
		messageBodyPart.setDataHandler(new DataHandler(source));
		messageBodyPart.setFileName(name);
		messageBodyPart.setDisposition(MimeBodyPart.ATTACHMENT);
		messageBodyPart.setHeader("ContentType", mimeType);
		return messageBodyPart;
	}
}

[Rob Spoor]

The problem is with the call to msg.setContent. That overrides the previous content. What you need to do, and what Ron did, was create one single MimeMultipart outside the loop, set that as content once, and add parts to it inside the loop; not create a new one for every attachment and overwrite the one for the previous attachment.

[Bill Melendez]

Paul, Ron:

Ron -- I see what you are referring to -the msg.setContent is within the loop so it gets replaced each time. That seems to be the problem even with the version you posted. Here's why: I can comment out the 2nd and 3rd files and the program will send the 1st file easily in both Paul's and yours. In both versions (Paul & Ron) the program can't find the following files even though all three files are in the same directory. However, I did set print so I can see that the array is working fine and the files are being accessed sequentially. However, only the last file itinerary is actually used.  Since I have 4 loops, the last file added is the first one.

I tried moving the setContent outside the "for loop" but then I get an error stating that multipart can't be found.  I do agree with your assessment as to the setContent getting files replaced each time the loop calls a new file. Just don't know how to resolve that. The problem is consistent with each version sample I use. All other portions work fine --multipart just will not keep all three files -- merely replaces each file as the new one is called.

Any help would be greatly appreciated.

[Ron McLeod]

Please post the current version of your code so that we can better understand the issues that you are describing.

[Bill Melendez]

Thank you! Here's the code. I am using the one posted last

, though either one would work with just one attachment --but not two or three.

public class eMAIL_FORM extends javax.swing.JFrame {
public String emailTO;
public String emailCC;
public String emailLOGONID;
public String emailPSWD;
public String user;
public String emailDATE;
public String emailFROM;
public String emailBCC;
//ArrayList filenames = new ArrayList();
  //  private Object fileNames;
public class CurrentDateTimeExample1 {    
     
   DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");  
   LocalDateTime now = LocalDateTime.now();  
  
}    
    /**
     * Creates new form eMAIL_FORM
     */
    public eMAIL_FORM() {
        initComponents();
        
    }
    
    
    
 
public void sendEMAIL() throws UnsupportedEncodingException, IOException, MessagingException{
        
        
     ArrayList<String> fileNames = new ArrayList<>(4);
    //Make the arraylist size of 3 match array capacity of 4
     for (int i = 0; i <= 4; i++) {
    fileNames.add("C:\\Docs\\Plumb-13052021.docx");
    fileNames.add("C:\\Docs\\Plumb1-13052021.xlsx");
    fileNames.add("C:\\Docs\\Plumb2-13052021.xlsx");
     }//end of for loop
     
 
   
    user = jtxtfld_USER.getText();
    emailPSWD = new String(this.jtxtfld_PASSWD1.getPassword());
    emailTO = jtxtfld_TO.getText();
    emailCC = jtxtfld_CC.getText();
    Date date = new Date();
    emailDATE = date.toString();
    emailFROM = jtxtfld_FROM.getText();
    //emailBCC = "     ";
    
    
    
    Properties props = new Properties();  
     Session session = Session.getDefaultInstance(props,new javax.mail.Authenticator() {  
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {  
      return new PasswordAuthentication(user,emailPSWD);   }  
    });   
     
      String filesLocation = "C:\\Docs";
      String Host = "smtp.gmail.com";
      String txtMSG = jtxtarea_MESSAGE.getText();
      
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", Host);//gmail host
      props.put("mail.smtp.port", "465");//587,993
      props.put("mail.smtp.ssl.enable", "true"); 
      props.setProperty("mail.user", user);
      props.setProperty("mail.password", emailPSWD);
      props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");  
    

        session.setDebug(true);

    
        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(user));
        msg.addRecipient(RecipientType.TO, new InternetAddress(emailTO));
        msg.setSubject("Plumber Report   " + date);
 
        MimeMultipart multipart = new MimeMultipart();
        msg.setContent(multipart);
         
        MimeBodyPart messageBodyPart1 = createTextPart("This is my message", "text/html");
        multipart.addBodyPart(messageBodyPart1);
 
        MimeBodyPart messageBodyPart2 = createBinaryPart(filesLocation, "Plumb-13052021.docx", "Docs/");
        multipart.addBodyPart(messageBodyPart2);
 
        //COMMENT OUT THESE FOLLOWING LINES
        /*
        
        MimeBodyPart messageBodyPart3 = createBinaryPart(filesLocation, "Plumb1-13052021.xlsx", "Docs/");
        multipart.addBodyPart(messageBodyPart3);
 
        MimeBodyPart messageBodyPart4 = createBinaryPart(filesLocation, "Plumb2-13052021.xlsx", "Docs/");
        multipart.addBodyPart(messageBodyPart4);
 
        */
        
        //********SEND MESSAGE********
        Transport.send(msg);
 
        System.out.println("Sent Ok");
    }
 
    private MimeBodyPart createTextPart(String text, String mimeType) throws MessagingException {
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setContent(text, mimeType);
        return messageBodyPart;
    }
 
    private MimeBodyPart createBinaryPart(String path, String name, String mimeType) throws MessagingException {
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        FileDataSource source = new FileDataSource(Paths.get(path, name).toFile());
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(name);
        messageBodyPart.setDisposition(MimeBodyPart.ATTACHMENT);
        messageBodyPart.setHeader("ContentType", mimeType);
        return messageBodyPart;
    }

        
        

[Ron McLeod]

This looks problematic:

MimeBodyPart messageBodyPart2 = createBinaryPart(filesLocation, "Plumb-13052021.docx", "Docs/");

The third parameter is supposed to be a MIME Type, which for a MS Word document would normally be: application/msword or  application/vnd.openxmlformats-officedocument.wordprocessingml.document .

Try changing that and see if you have any more more success.

[Bill Melendez]

Tried to post the other day --seems it didn't take. So I'm trying again. The attached program still will not let me send more than one attachment. I get a null exception.

package costfolder;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.file.Paths;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import java.util.Date;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import java.time.format.DateTimeFormatter;  
import java.time.LocalDateTime;   
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message.RecipientType;
import javax.mail.internet.MimeBodyPart;
import java.util.ArrayList;
import javax.mail.Multipart;
import javax.mail.internet.MimeMultipart;
         
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * 
 */
public class eMAIL_FORM extends javax.swing.JFrame {
public String emailTO;
public String emailCC;
public String emailLOGONID;
public String emailPSWD;
public String user;
public String emailDATE;
public String emailFROM;
public String emailBCC;
//ArrayList filenames = new ArrayList();
  //  private Object fileNames;
public class CurrentDateTimeExample1 {    
     
   DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");  
   LocalDateTime now = LocalDateTime.now();  
  
}    
    /**
     * Creates new form eMAIL_FORM
     */
    public eMAIL_FORM() {
        initComponents();
        
    }
public void sendEMAIL() throws UnsupportedEncodingException, IOException, MessagingException{
        
    /*    
     ArrayList<String> fileNames = new ArrayList<>(4);
    //Make the arraylist size of 3 match array capacity of 4
     for (int i = 0; i <= 4; i++) {
    fileNames.add("C:\\Docs\\Plumb-13052021.docx");
    fileNames.add("C:\\Docs\\Plumb1-13052021.xlsx");
    fileNames.add("C:\\Docs\\Plumb2-13052021.xlsx");
     }//end of for loop
    */
     String filesLocation ="C:\\Docs";
  
    user = jtxtfld_USER.getText();
    emailPSWD = new String(this.jtxtfld_PASSWD1.getPassword());
    emailTO = jtxtfld_TO.getText();
    emailCC = jtxtfld_CC.getText();
    Date date = new Date();
    emailDATE = date.toString();
    emailFROM = jtxtfld_FROM.getText();
    emailBCC = "     ";
    
    
    
    Properties props = new Properties();  
     Session session = Session.getDefaultInstance(props,new javax.mail.Authenticator() {  
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {  
      return new PasswordAuthentication(user,emailPSWD);   }  
    });     
     String Host = "smtp.gmail.com";
         
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", Host);//gmail host
      props.put("mail.smtp.port", "465");//587,993
      props.put("mail.smtp.ssl.enable", "true"); 
      props.setProperty("mail.user", user);
      props.setProperty("mail.password", emailPSWD);
      props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");  
    

session.setDebug(true);


    String txtMSG = jtxtarea_MESSAGE.getText();
   
    
           MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(user));
        msg.addRecipient(RecipientType.TO, new InternetAddress(emailTO));
        msg.setSubject("Email with attachements");
 
        MimeMultipart multipart = new MimeMultipart();
        msg.setContent(multipart);
         
        MimeBodyPart messageBodyPart1 = createTextPart("This is my message", "text/html");
        multipart.addBodyPart(messageBodyPart1);
 
        MimeBodyPart messageBodyPart2 = createBinaryPart(filesLocation, "Plumb-13052021.docx", "application/msword");
        multipart.addBodyPart(messageBodyPart2);
 
        MimeBodyPart messageBodyPart3 = createBinaryPart(filesLocation, "Plumb1-13052021.xlsx", "application/msexcel");
        multipart.addBodyPart(messageBodyPart3);
 
        MimeBodyPart messageBodyPart4 = createBinaryPart(filesLocation, "Plumb2-13052021.xlsx", "application/msexcel");
        multipart.addBodyPart(messageBodyPart4);
 
        //********SEND MESSAGE********
        Transport.send(msg);
 
        System.out.println("Sent Ok");
    
}
        
        
        
    private MimeBodyPart createTextPart(String text, String mimeType) throws MessagingException {
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setContent(text, mimeType);
        return messageBodyPart;
    }
 
    private MimeBodyPart createBinaryPart(String path, String name, String mimeType) throws MessagingException {
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        FileDataSource source = new FileDataSource(Paths.get(path, name).toFile());
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(name);
        messageBodyPart.setDisposition(MimeBodyPart.ATTACHMENT);
        messageBodyPart.setHeader("ContentType", mimeType);
        return messageBodyPart;
    }


NULL POINT EXCEPTION::

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:226)
	at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:299)
	at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1375)
	at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1021)
	at javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:419)
	at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1354)
	at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2107)
	at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2075)
	at javax.mail.Transport.send(Transport.java:123)
	at costfolder.eMAIL_FORM.sendEMAIL(eMAIL_FORM.java:133)
	at costfolder.eMAIL_FORM.jbtn_EMAILSENDActionPerformed(eMAIL_FORM.java:364)
	at costfolder.eMAIL_FORM.access$100(eMAIL_FORM.java:40)
	at costfolder.eMAIL_FORM$3.actionPerformed(eMAIL_FORM.java:212)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6533)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)
	at java.awt.Container.processEvent(Container.java:2236)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2294)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
	at java.awt.Container.dispatchEventImpl(Container.java:2280)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[Paul Clapham]

Bill Melendez wrote:Tried to post the other day --seems it didn't take. So I'm trying again. The attached program still will not let me send more than one attachment. I get a null exception.

Does that mean that when you tried the identical code, but with only one attachment, you didn't get that exception?

[Ron McLeod]

This is what I see when I run what you posted (without any Swing code):

[Ron McLeod]

Which version of JavaMail are you using?  I did my tests with:
    javax.mail-1.6.2.jar (com.sun.mail:javax.mail:1.6.2)
    activation-1.1.jar (javax.activation:activation:1.1) [dependency]

[Ron McLeod]

I found a typo in the example code that I posted (missing dash in Content-Type header name) - not sure if it would have any effect on the problem that you are seeing:

This:   messageBodyPart.setHeader("ContentType", mimeType);

Should be this:   messageBodyPart.setHeader("Content-Type", mimeType);

[Bill Melendez]

With the messageBodyPart3 and messageBodyPart4 included in the code I get an error message that states it can't find the next file (Plumb1-13052021.xlsx). However, all three files are in the same directory and it has no problem finding the first attachment (Plumb-13052021.docx). So it runs okay with the 3rd and 4th attachments "commented out." The error states it can't find the next attachment (Plumb1-13052021.xlsx) even though it has no problem locating the first one.

I'm using Java.mail-1.6.0 and activation-1.1. Here's error I'm getting:

run:
Jun 06, 2021 8:53:10 AM costfolder.eMAIL_FORM jbtn_EMAILSENDActionPerformed
SEVERE: null
javax.mail.MessagingException: IOException while sending message;
  nested exception is:
	java.io.FileNotFoundException: C:\Docs\Plumb1-13052021.xlsx (The system cannot find the file specified)
	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1365)
	at javax.mail.Transport.send0(Transport.java:255)
	at javax.mail.Transport.send(Transport.java:124)
	at costfolder.eMAIL_FORM.sendEMAIL(eMAIL_FORM.java:136)
	at costfolder.eMAIL_FORM.jbtn_EMAILSENDActionPerformed(eMAIL_FORM.java:369)
	at costfolder.eMAIL_FORM.access$100(eMAIL_FORM.java:34)
	at costfolder.eMAIL_FORM$3.actionPerformed(eMAIL_FORM.java:214)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6533)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)
	at java.awt.Container.processEvent(Container.java:2236)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2294)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
	at java.awt.Container.dispatchEventImpl(Container.java:2280)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.io.FileNotFoundException: C:\Docs\Plumb1-13052021.xlsx (The system cannot find the file specified)
	at java.io.FileInputStream.open0(Native Method)
	at java.io.FileInputStream.open(FileInputStream.java:195)
	at java.io.FileInputStream.<init>(FileInputStream.java:138)
	at javax.activation.FileDataSource.getInputStream(FileDataSource.java:97)
	at javax.activation.DataHandler.writeTo(DataHandler.java:305)
	at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1694)
	at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:996)
	at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:561)
	at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:84)
	at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:889)
	at javax.activation.DataHandler.writeTo(DataHandler.java:317)
	at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1694)
	at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1913)
	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1315)
	... 42 more

[Bill Melendez]

Ron:

I changed the JavaMail to 1.6.2 but get the same error codes.

[Ron McLeod]

It seems like even though you believe that the xlsx files do exist, they do not (to the application anyway).  Maybe it is a typo that is difficult to see, maybe a permissions problem, ???

To troubleshoot, put something like this in your code to print out what Plumb files are actually present/visible from the application's perspective.

File[] plumbFiles = new File(filesLocation).listFiles((dir, name) -> name.startsWith("Plumb"));
Arrays.stream(plumbFiles).forEach(System.out::println);

If the output looks ok, then try copying the file names from the output, and use those copied strings to replace the file name in your code just to be certain that the file name on disk matches the file name in your application code.

[Bill Melendez]

Ron:

Thank you so much for your persistence and support on this. I added the two lines you sent me and the reason the program didn't send the other 2 attachments was that I had the wrong file ending. It should have been "csv" and not "xlsx". Honestly, I was embarrassed since I then remember that the two spreadsheet files were actually exported database field entries --so the extension should have been "csv". The program now sends all three files without any issues. Thank you.

Is there some checkmark or uptick for this to show my approval of your support?

[Ron McLeod]

You're welcome - glad to see that you stuck it out and got it working in the end.  Sometimes the most obvious problems are to hardest ones to spot.

Our 'uptick' is a click on the 'thumbs-up' icon: