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Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3603969
By: matteo_barbieri
Hi, I have a problem and I don't know if it's caused by my application, ZK, Tomcat or MySQL.
When I use my application on a client, all works fine. But if I start another session on another client, it gives me this exception:
1-mar-2006 12.44.27 org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already.
Could not load com.mysql.jdbc.Messages. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1238)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1198)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.mysql.jdbc.CommunicationsException.<init>(CommunicationsException
.java:174)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2710)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2621)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1338)
at com.mysql.jdbc.Connection.realClose(Connection.java:4429)
at com.mysql.jdbc.Connection.cleanup(Connection.java:1973)
at com.mysql.jdbc.Connection.finalize(Connection.java:3114)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
To make it work I have to reload the webapp with Tomcat.
I'm not a Tomcat expert, so maybe this error is caused by my configuration.
Could you give some advices?
Thanks.
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3604762
By: tomyeh
According the stack trace, it looks like MySQL issue. Would you post this to their forum for real experty?
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3604769
By: tomyeh
Hi Matteo,
I got no experience with MySQL (PostgreSQL is my favor). The stack trace looks odd to me: it looks like it is closing something (usually caused by recycle connections), but trying to load another class!
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3604822
By: matteo_barbieri
There was another similar error before, maybe it's more important:
org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already.
Could not load java.net.BindException. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
That's why I don't think it's a MySQL error.
P.S. I would like to switch to PostgreSQL one day
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3604847
By: tomyeh
There is one possibility. ZK starts an independent thread to handle event, so developer could suspend it without blocking the response.
On the other hand, some transaction manager uses ThreadLocale to store info.
It usually causes problem if you closes a transaction in a thread different from it is started.
Would you show me how you start and close the transaction?
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3604875
By: matteo_barbieri
Hmm...
If you mean MySQL transactions I use Torque, so I don't manage transactions manually.
Now I verified that this error occours on the second client when I read the database.
I think I'll write also to the Torque mailing list.
Thank you
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3608449
By: matteo_barbieri
No. :(
I've tried to ask to the Torque mailing list, but they think it's not a Torque problem.
Now I'm trying to investigate with Tomcat people, and I'm going to try with another application server.
It seems that the second browser uses the same MySQL connection of the first browser and that causes problems.
When I used php I hadn't this kind of problem, so maybe it could be even a problem with ZK, Torque and how they use thread or connections...
I don't know.
Thank you for interesting.
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3608417
By: tomyeh
Hi Matteo,
Did you get the answer yet?
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3608965
By: tomyeh
I'll look at it, too. But, I am occupied these days, so maybe some day next week -- hope so :)
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3612726
By: matteo_barbieri
Nothing yet.
Asking around it seems it's a thread problem.
Maybe when I use a MySQL connection with ZK the connection remains active, and then creating another connection with another client, it throws this exception.
I don't know...
Orignial message at:
https://sourceforge.net/forum/message.php?msg_id=3613138
By: matteo_barbieri
Talking with some Tomcat guys, they say that I could try to stop threads with application listeners, because this could cause the problem.
Do you know what it means?
How does ZK stops threads?
Asked: 2006-03-01 11:52:56 +0800
Seen: 410 times
Last updated: Apr 07 '06
