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Posted to users@tomcat.apache.org by Madhur Ahuja <ah...@gmail.com> on 2015/03/29 11:17:48 UTC
Tomcat - thread dies randomly
We have built a messaging server using PubNub which listens for chat
messages from Android device.
For this, our J2EE based spring, we have created a Pubnub listener (which
is basically a listening socket)
as follows. However, we have observed is that our server stops listening
randomly after few days. The
Tomcat keeps working fine, but just the socket stops listening. There is
not error in logs.
Can anyone help in diagnosing this issue? Specifcally, I want to ensure
that the below design to initiate a listener is durable and not prone
to errors.
public class IncomingListener implements ApplicationListener <
ContextRefreshedEvent > {
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
private static volatile boolean isContextLoaded = false;
@Autowired
ServletContext application;
synchronized(IncomingListener.class) {
if (isContextLoaded) {
System.out.println("WTF: Not initializing incoming
listener");
return;
}
try {
initialiseIncomingListener();
isContextLoaded = true;
} catch (JSONException e) {
e.printStackTrace();
} catch (AkoshaException e) {
e.printStackTrace();
}
}
}
private void initialiseIncomingListener()
{
// Initialize our Pubnub Listener
pubnub.subscribe(serverchannel, new Callback() {
// Subscribe to pubnub
});
}
}
Re: Tomcat - thread dies randomly
Posted by Marcos Almeida Azevedo <ma...@gmail.com>.
On Sun, Mar 29, 2015 at 5:17 PM, Madhur Ahuja <ah...@gmail.com>
wrote:
> We have built a messaging server using PubNub which listens for chat
> messages from Android device.
> For this, our J2EE based spring, we have created a Pubnub listener (which
> is basically a listening socket)
> as follows. However, we have observed is that our server stops listening
> randomly after few days. The
> Tomcat keeps working fine, but just the socket stops listening. There is
> not error in logs.
>
> Can anyone help in diagnosing this issue? Specifcally, I want to ensure
> that the below design to initiate a listener is durable and not prone
> to errors.
>
Seems the issue is with your application not Tomcat. Maybe try WebSocket?
>
> public class IncomingListener implements ApplicationListener <
> ContextRefreshedEvent > {
>
> @Override
> public void onApplicationEvent(ContextRefreshedEvent event) {
>
> private static volatile boolean isContextLoaded = false;
>
> @Autowired
> ServletContext application;
>
> synchronized(IncomingListener.class) {
>
> if (isContextLoaded) {
> System.out.println("WTF: Not initializing incoming
> listener");
> return;
> }
> try {
> initialiseIncomingListener();
> isContextLoaded = true;
> } catch (JSONException e) {
> e.printStackTrace();
> } catch (AkoshaException e) {
> e.printStackTrace();
> }
>
> }
> }
>
> private void initialiseIncomingListener()
> {
> // Initialize our Pubnub Listener
>
> pubnub.subscribe(serverchannel, new Callback() {
>
> // Subscribe to pubnub
> });
> }
> }
>
--
Marcos | I love PHP, Linux, and Java
<http://javadevnotes.com/java-string-to-double-examples>
Re: Tomcat - thread dies randomly
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Madhur,
On 3/29/15 5:17 AM, Madhur Ahuja wrote:
> We have built a messaging server using PubNub which listens for
> chat messages from Android device. For this, our J2EE based spring,
> we have created a Pubnub listener (which is basically a listening
> socket) as follows.
If you have a component that opens its own socket, then it's not
really using Tomcat for anything. Someone here might be able to help,
but it sounds like this is not really Tomcat-related.
> However, we have observed is that our server stops listening
> randomly after few days. The Tomcat keeps working fine, but just
> the socket stops listening. There is not error in logs.
Yup, it sounds like it's not Tomcat-related. I'll let some others on
the list with more Spring-related experience jump in and try to help.
- -chris
> Can anyone help in diagnosing this issue? Specifically, I want to
> ensure that the below design to initiate a listener is durable and
> not prone to errors.
>
> public class IncomingListener implements ApplicationListener <
> ContextRefreshedEvent > {
>
> @Override public void onApplicationEvent(ContextRefreshedEvent
> event) {
>
> private static volatile boolean isContextLoaded = false;
>
> @Autowired ServletContext application;
>
> synchronized(IncomingListener.class) {
>
> if (isContextLoaded) { System.out.println("WTF: Not initializing
> incoming listener"); return; } try { initialiseIncomingListener();
> isContextLoaded = true; } catch (JSONException e) {
> e.printStackTrace(); } catch (AkoshaException e) {
> e.printStackTrace(); }
>
> } }
>
> private void initialiseIncomingListener() { // Initialize our
> Pubnub Listener
>
> pubnub.subscribe(serverchannel, new Callback() {
>
> // Subscribe to pubnub }); } }
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