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From "Noam Camiel" <n...@mdrm.com>
Subject Re: tomcat jitters, then hangs - please help
Date Wed, 01 Oct 2003 16:11:43 GMT
Hi, and thanks for the comments,

> On Wednesday, October 01, 2003 2:52 PM  "Shapira, Yoav"
<Yoav.Shapira@mpi.com> wrote:
> Oh, these problems are invariably a pain to debug ;)
yea.... nothing like a good challenge :)

> At that time, if you send the VM a SIGQUIT, what are the threads doing?
I've got a thread dump at the end of the file. Please have a look and tell
me if you see something odd.

> Is the behavior the same if all you have in your webapp is the Hello
> servlet?  I.e. you take all other servlets, especially the ones that use
> JDBC, out?  There have been problems reported in the past with DB
> connection pool threads just hanging around.

I just set up my other linux machine only with the "Hello" servlet, lets see
if that gets to the same state, so far its OK

> >the simple "Hello" servlet  (code at the bottom). After calling it a
>>few
> >times there was no

>So the first few times it works?

Yes, all works well until a time when the Tomcat reaches a state where is
sometimes replies to HTTP requests and sometimes not.  I managed to get the
manager status page this way.  Shortly after it all gets stuck.

> Also, the fact the manager status page sometimes works and sometimes
> doesn't is worrisome.  I've never had problems with it, and it should be
> very reliable.  Can you can the manager webapp to malfunction even
> without any of your webapps deployed on the server?  If so, open a
> bugzilla issue with steps to reproduce your behavior.

The manager webapp work well until after the unstable state where the Tomcat
simply stops answering any HTTP request.

> Any errors in the logs?  (Also make sure you have adequate disk space to
> write logs and temp files).

No errors in the logs and no problems with disk space.

On Wednesday, October 01, 2003 3:10 PM  "Arthur Veinstein"
<arthur@telemessage.com>  wrote:
Hi Arthur ;)
> Sounds like you have some problem with the DB connection.
> Can you provide the server.xml configuration ?

The server.xml is the same as it was with the installation, apart from the
port change from 8080 to 80.  Could that lead to a problem if I work with
JDBC?

Please let me know what you think,
Thanks,
Noam


-------------------------------------------thread
dump ---------------------------------------------


Full thread dump Java HotSpot(TM) Client VM (1.4.1_05-b01 mixed mode):

"TP-Monitor" daemon prio=1 tid=0x0x82440a0 nid=0x72c3 in Object.wait()
[4e29f000..4e29f390]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44cd9760> (a
org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
 at
org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.jav
a:549)
 - locked <0x44cd9760> (a
org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
 at java.lang.Thread.run(Thread.java:536)

"TP-Processor4" daemon prio=1 tid=0x0x8243390 nid=0x72c3 runnable
[4e21f000..4e21f410]
 at java.net.PlainSocketImpl.socketAccept(Native Method)
 at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:353)
 - locked <0x44cd97e8> (a java.net.PlainSocketImpl)
 at java.net.ServerSocket.implAccept(ServerSocket.java:448)
 at java.net.ServerSocket.accept(ServerSocket.java:419)
 at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:278)
 at
org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:572)
 at org.apache.jk.common.SocketAcceptor.runIt(ChannelSocket.java:758)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:666)
 at java.lang.Thread.run(Thread.java:536)

"TP-Processor3" daemon prio=1 tid=0x0x8242818 nid=0x72c3 in Object.wait()
[4e19f000..4e19f490]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44cd9958> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44cd9958> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"TP-Processor2" daemon prio=1 tid=0x0x82779d8 nid=0x72c3 in Object.wait()
[4e11f000..4e11f510]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44cd99d8> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44cd99d8> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"TP-Processor1" daemon prio=1 tid=0x0x8277628 nid=0x72c3 in Object.wait()
[4e09f000..4e09f590]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44cd9a58> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44cd9a58> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Monitor" daemon prio=1 tid=0x0x8291770 nid=0x72c3 in Object.wait()
[4e01f000..4e01f610]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5e898> (a
org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
 at
org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.jav
a:549)
 - locked <0x44c5e898> (a
org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor25" daemon prio=1 tid=0x0x8290bc0 nid=0x72c3 in
Object.wait() [4df9f000..4df9f690]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5e920> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5e920> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor24" daemon prio=1 tid=0x0x8290010 nid=0x72c3 in
Object.wait() [4df1f000..4df1f710]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5e9a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5e9a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor23" daemon prio=1 tid=0x0x828f460 nid=0x72c3 in
Object.wait() [4de9e000..4de9e790]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5ea20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5ea20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor22" daemon prio=1 tid=0x0x828e3b0 nid=0x72c3 in
Object.wait() [4de1e000..4de1e810]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5eaa0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5eaa0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor21" daemon prio=1 tid=0x0x828d800 nid=0x72c3 in
Object.wait() [4dd9e000..4dd9e890]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5eb20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5eb20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor20" daemon prio=1 tid=0x0x828cc70 nid=0x72c3 in
Object.wait() [4dd1e000..4dd1e910]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5eba0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5eba0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor19" daemon prio=1 tid=0x0x828c130 nid=0x72c3 in
Object.wait() [4dc9e000..4dc9e990]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5ec20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5ec20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor18" daemon prio=1 tid=0x0x8212ff0 nid=0x72c3 in
Object.wait() [4dc1e000..4dc1ea10]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5eca0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5eca0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor17" daemon prio=1 tid=0x0x8212440 nid=0x72c3 in
Object.wait() [4db9e000..4db9ea90]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5ed20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5ed20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor16" daemon prio=1 tid=0x0x8211890 nid=0x72c3 in
Object.wait() [4db1e000..4db1eb10]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5eda0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5eda0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor15" daemon prio=1 tid=0x0x8210ce0 nid=0x72c3 in
Object.wait() [4da9e000..4da9eb90]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5ee20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5ee20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor14" daemon prio=1 tid=0x0x820fc30 nid=0x72c3 in
Object.wait() [4da1e000..4da1ec10]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5eea0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5eea0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor13" daemon prio=1 tid=0x0x820f080 nid=0x72c3 in
Object.wait() [4d99e000..4d99ec90]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5ef20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5ef20> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor12" daemon prio=1 tid=0x0x820e4d0 nid=0x72c3 in
Object.wait() [4d91e000..4d91ed10]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5efa0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5efa0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor11" daemon prio=1 tid=0x0x820d920 nid=0x72c3 in
Object.wait() [4d89e000..4d89ed90]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f020> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f020> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor10" daemon prio=1 tid=0x0x820c870 nid=0x72c3 in
Object.wait() [4d81e000..4d81ee10]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f0a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f0a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor9" daemon prio=1 tid=0x0x820bcc0 nid=0x72c3 in
Object.wait() [4d79e000..4d79ee90]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f120> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f120> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor8" daemon prio=1 tid=0x0x820b110 nid=0x72c3 in
Object.wait() [4d71e000..4d71ef10]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f1a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f1a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor7" daemon prio=1 tid=0x0x820a560 nid=0x72c3 in
Object.wait() [4d69e000..4d69ef90]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f220> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f220> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor6" daemon prio=1 tid=0x0x8209870 nid=0x72c3 in
Object.wait() [4d61e000..4d61f010]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f2a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f2a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor5" daemon prio=1 tid=0x0x8208cc0 nid=0x72c3 in
Object.wait() [4d59e000..4d59f090]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f320> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f320> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor4" daemon prio=1 tid=0x0x8208110 nid=0x72c3 in
Object.wait() [4d51e000..4d51f110]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f3a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f3a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor3" daemon prio=1 tid=0x0x8207580 nid=0x72c3 in
Object.wait() [4d49f000..4d49f190]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f420> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f420> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor2" daemon prio=1 tid=0x0x8206bb8 nid=0x72c3 in
Object.wait() [4d41f000..4d41f210]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f4a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f4a0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"http80-Processor1" daemon prio=1 tid=0x0x82068d8 nid=0x72c3 in
Object.wait() [4d39f000..4d39f290]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x44c5f520> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Object.wait(Object.java:426)
 at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:642)
 - locked <0x44c5f520> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
 at java.lang.Thread.run(Thread.java:536)

"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=1
tid=0x0x8203b08 nid=0x72c3 waiting on condition [4d31f000..4d31f310]
 at java.lang.Thread.sleep(Native Method)
 at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(Cont
ainerBase.java:1636)
 at java.lang.Thread.run(Thread.java:536)

"Signal Dispatcher" daemon prio=1 tid=0x0x80aa330 nid=0x72c3 waiting on
condition [0..0]

"Finalizer" daemon prio=1 tid=0x0x808c100 nid=0x72c3 in Object.wait()
[4c4ff000..4c4ff590]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x448f08d0> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
 - locked <0x448f08d0> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
 at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=1 tid=0x0x808b520 nid=0x72c3 in
Object.wait() [4c47f000..4c47f610]
 at java.lang.Object.wait(Native Method)
 - waiting on <0x448f0938> (a java.lang.ref.Reference$Lock)
 at java.lang.Object.wait(Object.java:426)
 at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:113)
 - locked <0x448f0938> (a java.lang.ref.Reference$Lock)

"main" prio=1 tid=0x0x80521e8 nid=0x72c3 runnable [bfffb000..bfffc23c]
 at java.net.PlainSocketImpl.socketAccept(Native Method)
 at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:353)
 - locked <0x44cdf918> (a java.net.PlainSocketImpl)
 at java.net.ServerSocket.implAccept(ServerSocket.java:448)
 at java.net.ServerSocket.accept(ServerSocket.java:419)
 at org.apache.catalina.core.StandardServer.await(StandardServer.java:552)
 at org.apache.catalina.startup.Catalina.await(Catalina.java:634)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:596)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
 at java.lang.reflect.Method.invoke(Method.java:324)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:392)

"VM Thread" prio=1 tid=0x0x808a208 nid=0x72c3 runnable

"VM Periodic Task Thread" prio=1 tid=0x0x80a8ee8 nid=0x72c3 waiting on
condition
"Suspend Checker Thread" prio=1 tid=0x0x80a98b0 nid=0x72c3 runnable



----- Original Message -----
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Wednesday, October 01, 2003 2:52 PM
Subject: RE: tomcat jitters, then hangs - please help



Howdy,
Oh, these problems are invariably a pain to debug ;)

>My Tomcat installation works fine until sometimes (usually after 24
hours),
>calling the simplest servlet locks up the Tomcat threads,
>causing the tomcat engine to be unresponsive.

At that time, if you send the VM a SIGQUIT, what are the threads doing?

>The servlets I'm running work with a mysql JDBC connector connecting to
>mysql database.

Is the behavior the same if all you have in your webapp is the Hello
servlet?  I.e. you take all other servlets, especially the ones that use
JDBC, out?  There have been problems reported in the past with DB
connection pool threads just hanging around.

>the simple "Hello" servlet  (code at the bottom). After calling it a
few
>times there was no

So the first few times it works?

>more response from the server and the tomcat manager/status page (which
>sometimes returns and sometimes not) clearly shows that the "Hello"
servlet
>is stuck:
>
>Stage 1:  After calling the "Hello" servlet
>
>Stage    Time        B Sent    B Recv    Client                VHost
>Request
>S        32671 ms   0KB        0KB        194.90.90.18       mdrmus
Get

Actually, this shows your servlet wasn't even called: no bytes sent OR
received.  Are you sure you're not having a network failure?

Also, the fact the manager status page sometimes works and sometimes
doesn't is worrisome.  I've never had problems with it, and it should be
very reliable.  Can you can the manager webapp to malfunction even
without any of your webapps deployed on the server?  If so, open a
bugzilla issue with steps to reproduce your behavior.

>If anyone has any idea how to solve this problem, I would be most
grateful.

Any errors in the logs?  (Also make sure you have adequate disk space to
write logs and temp files).

Yoav Shapira



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