Tranport.connect() blocks or if timeout is set builds unstopable threads
Hi,
I'am really in trouble while trying to build a simple "send an email" functionality in my software.
I'am trying to connect to a SMTP server that is unreachable (assume there is a firewall blocking the packets on there way to the SMTP server of my choice). The first problem was, that Transport.connect() does never finish. So this Forum told me: "set mail.smtp.connectiontimeout" and everything gets fine. This is true, as I get an exception when the connect takes to long.
So everthing was fine to me, as long as the application was running. But as I stopped the application (its a server app) I saw one Thread for each connect that failed. And these Threads are no deamon threads so they prevent the VM from exiting. Even when they are deamon threads it is a bad habit, because I will get masses of threads over the time.
Thats why I'am really in trouble. Does anybody knows a solution, where i can recognize that a timeout occured during connect and no "everlasting" is started?
Here are some code snippets from my app:
smtpServerProps.setProperty("mail.smtp.connectiontimeout", "10000");
smtpServerProps.setProperty("mail.smtp.timeout", "10000");
Session session = Session.getDefaultInstance(smtpServerProps);
Transport trans = session.getTransport("smtp");
trans.connect();
mail.saveChanges();
trans.sendMessage(mail, mail.getAllRecipients());
trans.close();
JavaMail 1.4 implements connection timeouts without needing an
additional thread. Upgrade to JavaMail 1.4.
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I wrote another easy socket program by myself, strace it and find that the program blocked in the "accept" system call. How can I solve this problem, or what can I do to find out more clues? Thanks very much.
Last edited by henryouly (2007-06-16 12:17:34)Lucke most likely nailed it. FWIW, all SYN_SENT means is that you weren't sent an RST and the SYN attempt silently failed for whatever reason. You can create the exact same state by sshing to a host that either doesn't exist on your network or is down. Probably if you were sniffing traffic on your network, what you'd see is several ARPs coming from your machine, and no answers, or an ARP request, and ARP reply, and then a SYN packet with no reply. In any case, it's most likely wrappers blocking access to the port.
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< MODERATOR: Message locked. Please read the [Rules of Engagement|https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/rulesofEngagement] before posting next time. Use an appropriate subject in your message thread. >
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Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
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If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
Cheers, Tom -
Tried to use iphone connecting to wifi but failed dispite password correct, cable connection ok, and even reset network setting in iphone. Anyone can help?
Kin ChiI get in now with the following procedures taken:
1. Reset network as suggested in Apple app.
2. In the wifi connection, instead click in the user name as shown in the screen, I click Others and re-type the user name as appeared before. In the security, instead of none, I click WEP. It will then prompt you to put in password. I then put in password as I know for that user name again.
Then, it joined the wifi..
Hope this can help someone who get this problem.
Kin Chi -
Since upgrading to iOS 6 my iPhone now does not connect to my 2013 elantras Bluetooth set up where as with the previous version of iOS it connected seamlessly. Please let me know if you have any solutions. Thanks
Have you checked to see if Elentra has a firmware update since the new iOS release?
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My iphone will not connect to the airport network since I added a security password. The ipad connected immediately. Is there a setting on the phone that I need to change?
Answered this question with a reply from "how does an iphone forget a network" response
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I am a group exercise instructor and rely heavily on my playlists. My old phone is an iphone 4s and I just bought an Iphone 6. I also have a macbook where I keep my itunes account, but I create all my playlists on my phone. I need to transfer those playlists from my old iphone into itunes in my computer so that I can then add them to my new iphone 6. However, none of the playlists on my iphone appear when I connect to my macbook. I have read other threads where the suggestion was to attach the old phone to itunes, find the phone in itunes and click the little arrow to the left to show the playlists. Then right click on the playlist and export it, saving it to the desktop, to then import it into itunes. However, in my case, the playlists do not show up when the phone is connected to itunes. I have clicked on the little arrow and all I get is "music", "purchased", etc., but none of my playlists. I'm sure some years back I probably deleted something in my itunes library and now none of my playlists show. Please help me. I would hate to have to recreate all of my playlists. Thank you!
I know it sounds weird, and that is the reason I posted my question. Because my case is not like all the ones I've found online and it's confusing. I added a screen capture of my itunes with my old iphone (the one that houses my playlists) connected to it.
My playlists "ARE" in my iphone 4s. They are still there even though they do not show up when I plug in to itunes in my computer.
When connecting my phone to itunes on my macbook, the playlists do not appear anywhere in itunes. I have found my connected iphone icon, I have clicked on the arrow next to it and it does pull up the standard lists that come with the iphone/itunes: Music, Movies, TV shows, books. That's it! below that is "Genius" and below "Geniuns" is "PLAYLISTS" but the only playlist of mine that shows there is one that I created several years back titled "90's music" and that one I created it on my computer, not my phone. Under "90's music" there are also other standard playlists that itunes automatically adds.
Does anyone else have this issue or know how to get around this. I am starting to think that I am going to have to recreate these lists on my computer -
How to handle the "Must set build.archive.dir"?
Hi friends,
When i run my application i see the given bug:
C:\Users\user\Desktop\ticketing\nbproject\build-impl.xml:91: Must set build.archive.dir
i will appreciate it if anybody help me
Thanks
Reza_mpRight. But the parameter screen is driven by the viewer. Unless you create your own parameter screen and pass the parameters to the report via code.
Another thing I am not sure about:
"Then by code I want to read all the employees id from the report and send email to them with specified pages of the report. (1 page per employee)"
How do you plan on reading the employee ID from the report? I am not aware of any API that will read a value in a report so that you can then decide what page to send to whom.
I think you're approaching this kinda backwards. A question to ask is; can you do what you are trying to do in code in the CR designer? If not, using APIs will not work either. I suspect your approach should be a report that uses an employee filter. Run the report for employee x, get the report populated with the data for that employee and email it. Repeat for employee x1, employee x2, etc.
- Ludek
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