Unable to import javax.activation in Jdeveloper for MAF

问题

I am trying to deploy an Oracle MAF app to the iOS platform. I am using Java Mail to receive emails from the gmail server. I am trying to to identify mails that have attachments. However I get the following error.

java.lang.ClassCastException: com.sun.mail.imap.IMAPInputStream cannot be cast to javax.mail.Multipart

When I identify the mime type of the message as "multipart/mixed", I am trying to cast the object into Multipart.

I understand that this question has been asked before but I have tried to implement the solution proposed here. However I am unable to import anything from javax.activation. The error that I get in jdeveloper is

Error : javax.activation.CommandMap is not available in the profile.

This error shows up for everything from javax.activation

Also, this error pops up only in an MAF application. It works well in a normal java project.

How can I handle this issue?

import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;

public class Email {
    public Email() 
    {

        String userName = "abc@gmail.com";
        String password = "password";
        String receivingHost;

        receivingHost="imap.gmail.com";

        Properties props=System.getProperties();
        props.setProperty("mail.store.protocol", "imaps");

        Session session=Session.getDefaultInstance(props, null);

        try 
        {
             Store store=session.getStore("imaps");
             store.connect(receivingHost,userName, password);
             Folder folder=store.getFolder("INBOX");
             folder.open(Folder.READ_ONLY);
             Message messages[]=folder.getMessages();

             //System.out.println(messages.length);
             for (Message message : messages) 
             {
                 if(message.isMimeType("multipart/mixed")) 
                 {
                     Multipart mp = (Multipart)message.getContent();
                     //get content    
                 }
                 else 
                 {
                    //getcontent
                 }
             }

             store.close();

        }
        catch (Exception e) 
        {
            System.out.println(e.toString());
        }
        //System.out.println("Done");
    }
}

来源：https://stackoverflow.com/questions/38436576/unable-to-import-javax-activation-in-jdeveloper-for-maf