in java: when I fetch imaps folders multiple in one minute, i see this error: Unexpected item LIST

my code is

import javax.mail.Folder;
import javax.mail.Session;
import javax.mail.Store;
import javax.net.ssl.SSLContext;
import java.util.Properties;


....
....

        Store store = null;
        Folder mailFolder = null;
        Properties props = System.getProperties();
        props.setProperty("mail.store.protocol", "imaps");
        try {
            SSLContext ctx = SSLContext.getInstance("TLSv1.2");
            ctx.init(null, null, null);
            SSLContext.setDefault(ctx);
        } catch (Exception e) {
            e.printStackTrace();
        }
        props.setProperty("mail.imaps.sasl.enable", "true");

        Session session2 = Session.getDefaultInstance(props);
        session2.setDebug(true);
        store = session2.getStore("imaps");
        store.connect("mailtest.com", 993, "test", "test");
        mailFolder = store.getDefaultFolder();
        javax.mail.Folder[] f = mailFolder.list("*");

debug is:

DEBUG: setDebug: JavaMail version 1.4ea DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc] DEBUG: mail.imap.fetchsize: 16384 DEBUG: enable SASL

• OK mailtest.com A0 CAPABILITY
• CAPABILITY IMAP4rev1 CHILDREN IDLE LITERAL+ MULTIAPPEND SPECIAL-USE NAMESPACE UIDPLUS QUOTA XLIST ID LOGINDISABLED AUTH=CRAM-MD5 AUTH=DIGEST-MD5 AUTH=GSSAPI ACL RIGHTS=texkbn A0 OK CAPABILITY completed IMAP DEBUG: AUTH: CRAM-MD5 IMAP DEBUG: AUTH: DIGEST-MD5 IMAP DEBUG: AUTH: GSSAPI DEBUG: protocolConnect login, host=mailtest.com, user=test, password= IMAP SASL DEBUG: Mechanisms: CRAM-MD5 DIGEST-MD5 GSSAPI IMAP SASL DEBUG: callback length: 2 IMAP SASL DEBUG: callback 0: javax.security.auth.callback.NameCallback@663b1c53 IMAP SASL DEBUG: callback 1: javax.security.auth.callback.PasswordCallback@32c0c194 IMAP SASL DEBUG: SASL client CRAM-MD5 A1 AUTHENTICATE CRAM-MD5

• PDQwMjM2ODc1MTEuMTU2NjkxNDZAd2VibWFpbC5zaGlyYXp1LmFjLmlyPg== IMAP SASL DEBUG: challenge: 4023687511.15669146@mailtest.com : IMAP SASL DEBUG: response: test 8127c2303f4866ee9e7e934227f10bc7 : c3NvdGVzdDEgODEyN2MyMzAzZjQ4NjZlZTllN2U5MzQyMjdmMTBiYzc= A2 LIST "" "*" A1 NO AUTHENTICATE failed A2 BAD Error: Unexpected item LIST javax.mail.MessagingException: A2 BAD Error: Unexpected item LIST;
  nested exception is: com.sun.mail.iap.BadCommandException: A2 BAD Error: Unexpected item LIST at com.sun.mail.imap.IMAPFolder.doCommand(IMAPFolder.java:2337) at com.sun.mail.imap.DefaultFolder.list(DefaultFolder.java:62) at com.liferay.portlet.action.NotificationPortlet.serveResource(NotificationPortlet.java:146)