org.apache.tomcat.util.threads.ThreadPool

[Chakarova Teodora <TC...@globul.bg>]

 

Hello everybody,
We have a problem with a web application under apache tomcat.It simply
connects to a oracle database and inserts a row. There are very often
problems with the database server, and it needs often restarts , so =20
The exception thrown usually is "Connection reset, Network adapter could
not be established" and so on. But the last time the application is
mysteriously hanging with this message:=20 Feb 26, 2006 11:13:11 AM
org.apache.tomcat.util.threads.ThreadPool
logFull
SEVERE: All threads (150) are currently busy, waiting. Increase
maxThreads (150) or check the servlet status Feb 26, 2006 11:58:23 AM
org.apache.catalina.mbeans.ServerLifecycleListener lifecycleEvent
SEVERE: destroyMBeans: Throwable
javax.management.InstanceNotFoundException:
Catalina:type=3DResource,resourcetype=3DGlobal,class=3Dorg.apache.catali
n=
a.Use
rDatabase,name=3D"UserDatabase"
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(De
faultMBeanServerInterceptor.java:374)
at
com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.ja
va:527)
at
org.apache.catalina.mbeans.MBeanUtils.destroyMBean(MBeanUtils.java:1498)
at
org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(ServerL
ifecycleListener.java:771)
at
org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(ServerL
ifecycleListener.java:922)
at
org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(ServerL
ifecycleListener.java:960)
at
org.apache.catalina.mbeans.ServerLifecycleListener.lifecycleEvent(Server
LifecycleListener.java:153)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSu
pport.java:119)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:711)
at org.apache.catalina.startup.Catalina.stop(Catalina.java:586)
at
org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.j
ava:629)
My assumption is that the connections to the oracle server are hanging
for some reason. I tried to put validationQuery parameter in the
configuration file. But I don`t understand the sequence of actions, when
tomcat determines that a connection is not working properly(using the
validation query), it will try to establish it again, am I right? But
when for some reason the connection is hanging, then what is the right
reaction? Maybe setting a value for maxWait parameter, so the other
users not to wait for connection and not to occupy all threads ?
Our configuration is:=20
Jakarta Tomcat 5.5.9
j2sdk 1.5=20
redhat el as 3.0 update 4
Could anybody explain me something more???=20 Thank you in advance!
Kind regards=20
Teodora



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Re: org.apache.tomcat.util.threads.ThreadPool

[Stas Ostapenko <st...@gmail.com>]

On 2/27/06, Chakarova Teodora <TC...@globul.bg> wrote:
> SEVERE: All threads (150) are currently busy, waiting. Increase
> maxThreads (150) or check the servlet status Feb 26, 2006 11:58:23 AM
You can increase maxThreads value in your server.xml config file to
satisfy your application needs. But I can't say nothing about problems
with Oracle.

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