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From "Carl" <>
Subject Tomcat dies suddenly
Date Fri, 29 Jan 2010 19:54:09 GMT
6-7 weeks ago, we built up some new servers and started having sudden failures... Tomcat just
stops with no error message, no system error messages, nothing that I have been able to find
so far.

To refresh everyone's memory, this is a new server, a Dell T110 with a Xeon 3440 processor
and 4GB memory.  I have turned off both the turbo mode and hyperthreading.

The environment:

64 bit Slackware Linux

java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode)

Tomcat: apache-tomcat-6.0.20

These are the current JAVA_OPTS="-Xms1024m -Xmx1024m -XX:PermSize=368m -XX:MaxPermSize=368m"

I have observed the memory usage and general performance with Java VisualVM and have seen
nothing strange.  I thought I was seeing GC as memory usage was going up and down but in fact
it was mostly people coming onto the system and leaving it.  After several hours, the memory
settles to a baseline of about 375MB.  Forced GC never takes it below that value and the ups
and downs from the people coming onto and leaving the system also returns it to pretty much
that value.  The maximum memory used never was above 700MB for the entire day.

The server runs well, idling along at 2-5% load, except for a quick spike during GC, serving
jsp's, etc. at a reasonable speed.  Without warning and with no tracks in any log (Tomcat
or system) or to the console, Tomcat just shuts down.  I can usually simply restart it as
the ports used by Tomcat are closed... today, I needed to run before I could run ( gave no errors but would not start Tomcat until I ran and
that process put nothing in the logs... this is the first time this has happened.)  

Sometimes, the system will run for a week, sometimes for only several hours, sometimes only
for a few minutes.  Today, it ran until about 1:00PM and has been down four times since then.

The failure (Tomcat shutting down) is not always the same place in the code (I have some debugging
messages going to catalina.out.)

Load does not seem to make a difference.

I have tried another sever (Dell T105, AMD processor, 6GB memory) and have observed the same
results.   I have run memTest86 on the T110 for about 30 hours and it showed nothing. 

I rebuilt the T110 with SUSE linux, Java 1.6.18 and Tomcat 6.0.24... it lasted 15 minutes.
 I have used the same server.xml on all the installs:

<Server port="8005" shutdown="SHUTDOWN">
<!--APR library loader. Documentation at /docs/apr.html -->

<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />

<!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html

<Listener className="org.apache.catalina.core.JasperListener" />

<!-- JMX Support for the Tomcat server. Documentation at /docs/non-existent.html -->

<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />

<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />

<!-- Global JNDI resources

Documentation at /docs/jndi-resources-howto.html



<!-- Editable user database that can also be used by

UserDatabaseRealm to authenticate users


<Resource name="UserDatabase" auth="Container"


description="User database that can be updated and saved"


pathname="conf/tomcat-users.xml" />


<!-- A "Service" is a collection of one or more "Connectors" that share

a single "Container" Note: A "Service" is not itself a "Container", 

so you may not define subcomponents such as "Valves" at this level.

Documentation at /docs/config/service.html


<Service name="Catalina">

<!--The connectors can use a shared executor, you can define one or more named thread pools-->


<Executor name="tomcatThreadPool" namePrefix="catalina-exec-" 

maxThreads="150" minSpareThreads="4"/>


<!-- A "Connector" represents an endpoint by which requests are received

and responses are returned. Documentation at :

Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)

Java AJP Connector: /docs/config/ajp.html

APR (HTTP/AJP) Connector: /docs/apr.html

Define a non-SSL HTTP/1.1 Connector on port 8080


<Connector port="8080" protocol="HTTP/1.1" 


maxThreads="600" minSpareThreads="25" maxSpareThreads="75"

enableLookups="false" redirectPort="8443" scheme="http" acceptCount="100"

connectionTimeout="20000" disableUploadTimeout="true" />

<!-- A "Connector" using the shared thread pool-->


<Connector executor="tomcatThreadPool"

port="8080" protocol="HTTP/1.1" 


redirectPort="8443" />


<!-- Define a SSL HTTP/1.1 Connector on port 8443

This connector uses the JSSE configuration, when using APR, the 

connector should be using the OpenSSL style configuration

described in the APR documentation -->

<Connector port="8443" maxHttpHeaderSize="8192"

maxThreads="600" minSpareThreads="25" maxSpareThreads="75"

enableLookups="false" disableUploadTimeout="true"

acceptCount="100" scheme="https" secure="true"

clientAuth="false" sslProtocol="TLS" SSLEnabled="true"

keystoreFile="/usr/local/certs/tomcat_keystore.ks" keystorePass="jellybean"/>

<!-- Define a SSL HTTP/1.1 Connector on port 443 -->

<Connector port="443" maxHttpHeaderSize="8192"

maxThreads="600" minSpareThreads="25" maxSpareThreads="75"

enableLookups="false" disableUploadTimeout="true"

acceptCount="100" scheme="https" secure="true"

clientAuth="false" sslProtocol="TLS" SSLEnabled="true"

keystoreFile="/usr/local/certs/tomcat_keystore.ks" keystorePass="jellybean"/>


<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"

maxThreads="150" scheme="https" secure="true"

clientAuth="false" sslProtocol="TLS" />


<!-- Define an AJP 1.3 Connector on port 8009 -->

<Connector port="8009" 

enableLookups="false" redirectPort="443" protocol="AJP/1.3" />

<!-- An Engine represents the entry point (within Catalina) that processes

every request. The Engine implementation for Tomcat stand alone

analyzes the HTTP headers included with the request, and passes them

on to the appropriate Host (virtual host).

Documentation at /docs/config/engine.html -->

<!-- You should set jvmRoute to support load-balancing via AJP ie :

<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1"> 


<Engine name="Catalina" defaultHost="localhost">

<!--For clustering, please take a look at documentation at:

/docs/cluster-howto.html (simple how to)

/docs/config/cluster.html (reference documentation) -->


<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>


<!-- The request dumper valve dumps useful debugging information about

the request and response data received and sent by Tomcat.

Documentation at: /docs/config/valve.html -->


<Valve className="org.apache.catalina.valves.RequestDumperValve"/>


<!-- This Realm uses the UserDatabase configured in the global JNDI

resources under the key "UserDatabase". Any edits

that are performed against this UserDatabase are immediately

available for use by the Realm. -->

<Realm className="org.apache.catalina.realm.UserDatabaseRealm"


<!-- Define the default virtual host

Note: XML Schema validation will not work with Xerces 2.2.


<Host name="localhost" appBase="webapps"

unpackWARs="true" autoDeploy="true" deployOnStartup="true"

xmlValidation="false" xmlNamespaceAware="false">

<!-- SingleSignOn valve, share authentication between web applications

Documentation at: /docs/config/valve.html -->


<Valve className="org.apache.catalina.authenticator.SingleSignOn" />


<!-- Access log processes all example.

Documentation at: /docs/config/valve.html -->


<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" 

prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>






When Tomcat shuts down, the memory that it was using seems to still be held (as seen from
top) but it is nowhere near the machine physical memory.

The application has been running on an older server (Dell 600SC, 32 bit Slackware, 2GB memory)
for several years and, while the application will throw exceptions now and then, it never
crashed.  This lead me to believe the problem had something to do with the 64 bit JVM but,
with without seeing errors anywhere, I can't be certain and don't know what I can do about
it except go back to 32 bit.

One time, I observed the heap and permGen memory usage with Visual JVM.  It was running around
600MB before I forced a GC and 375MB afterward.  Speed was good.  Memory usage from top was
2.4GB.  Five minutes later, Tomcat stopped leaving no tracks that I could find.  The memory
usage from top was around 2.4GB.  The memory usage from Visual JVM was still showing 400MB+
although the Tomcat process was gone.  I restarted Tomcat (did not reboot) so Tomcat had been
shutdown gracefully enough to close the ports (8080, 8443, 443.)  Tomcat stayed up for less
than an hour (under light load) and stopped again.  The memory used according to top was less
than 3GB but I didn't get the exact number.  I restarted it again (no server reboot) and it
ran for the rest of the night (light load) and top was showing 3.3GB for memory in the morning.

Anyone have any ideas how I might track this problem down?


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