Product Version = NetBeans IDE Dev (Build 201607210002)
Operating System = Linux version 4.4.0-31-generic running on amd64
Java; VM; Vendor = 1.8.0_102
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.102-b14

Reproducibility: Happens sometimes, but not always

Pasting Java code that will also need some new imports sometimes corrupts the imports in the target file. 

For example, pasting the following code block:

      // create and send a new one
      Message l_msg = new MimeMessage(l_session_out);
      
      // from is a list
      Address[] l_from = l_old_msg.getFrom();
      if (l_from != null && l_from.length > 0) {
        l_msg.setFrom(l_from[0]);
      }
      
      l_msg.setReplyTo(l_old_msg.getReplyTo());
      l_msg.addRecipient(Message.RecipientType.TO, new InternetAddress(a_redirect_to));
      l_msg.setSubject(l_old_msg.getSubject());
      l_msg.setSentDate(l_old_msg.getSentDate());
      
      // now the parts
      Object l_content = l_old_msg.getContent();
      if (l_content == null) {
        l_return = "Message has no content??!!";
      } else if (l_content instanceof Multipart) {
        Multipart l_mp_old = (Multipart) l_content;
        l_msg.setContent(l_mp_old);
      } else if (l_content instanceof String) {
        String l_old_type = l_old_msg.getContentType();
        if (StringUtil.isEmpty(l_old_type)) {
          l_old_type = "text/plain";
        }
        l_msg.setContent(l_content, l_old_type);
      } else {
        l_return = "Don't know how to deal with content type " + l_content.getClass().getName();
      }
      
      if (l_return == null) {
        Transport.send(l_msg);
      }


Resulted in this:

import javax.mail.Multipart;
import javax.mail.Message;
import javax.mail.PasswordAuthenticatiimport javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
on;
import javax.mail.Session;
import javax.mail.Store;


I can typically recover by deleting the corrupted import lines and doing "fix imports".