Fetching email with attachments in Tomcat

Question

I'm trying to process emails with attachments using following code and it works fine in standalone java application, but when I run this code on Tomcat it treates all messages as not multipart. Class of all contents got from messages is SharedByteArrayInputStream.
I'm using jdk1.6.0_27 and javamail1_4_5
I put mail.jar in WEB-INF/lib of my war.
Can anyone help my how to deal with this? What's wrong?
package test;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;
public class Main {
private static Store store;
private static Folder folder;
* @param args
* @throws Exception
public static void main(String[] args) throws Exception {
try {
List<Message> messages = getMessages("...", "...", "...");
for (Message mess : messages) {
System.out.println(mess.getSentDate());
Object content = mess.getContent();
if (content instanceof Multipart) {
System.out.println("miltipart");
} else {
System.out.println("plain");
} finally {
close();
public static List<Message> getMessages(String host, String userName, String password) throws Exception {
if (store != null || folder != null) {
throw new IllegalStateException("There are open and closed messages exist");
// create empty properties
Properties props = new Properties();
// get session
Session session = Session.getDefaultInstance(props, null);
try {
// get the store
store = session.getStore("pop3");
store.connect(host, userName, password);
// get folder
folder = store.getFolder("INBOX");
folder.open(Folder.READ_ONLY);
// get directory
return Arrays.asList(folder.getMessages());
} catch (MessagingException e) {
throw new Exception("Exception while mail receiving ", e);
public static void close() throws MessagingException {
// close connection
if (folder != null) {
folder.close(false);
if (store != null) {
store.close();
folder = null;
store = null;
}

Answer 1

But I found another interesting issue.
When I run my application everything works fine on first iteration. According to my code I get default instance of Session, get Store, get Folder and at last getMessages. After processing messages I close folder and store.
But if I don't restart my application and try to get messages again all of the SAME messages became plain (SharedByteArrayInputStream) again (as it was earlier).
If I restart my application first iteration works fine and others fails.
In both iterations used the same instance of class where I put Thread.currentThread().setContextClassLoader(BaseEmailService.class.getClassLoader());
What I must reinitialize to make it works on each iteration?