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Posted to users@tomcat.apache.org by Uma Kalluru <um...@gmail.com> on 2007/12/12 12:51:06 UTC

Multiple problems with Tomcat and Struts

Hi,

I am using Struts1.x with Tomcat 5.5 and I see lots of problems in the
log file. Actually I am using Struts data source manager to create
connection pool at the startup of the server.

The application works fine for some time but after some time the
connection object is null. I am not sure how this would happen. Can
any one help me out please? This is urgent.

Below is the log file from catalina.log file

Thanks
Uma

ERROR main org.apache.catalina.mbeans.ServerLifecycleListener -
Exception handling Container property change
java.lang.NullPointerException
	at org.apache.log4j.Category.isEnabledFor(Category.java:746)
	at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:327)
	at org.apache.catalina.mbeans.ServerLifecycleListener.processContainerPropertyChange(ServerLifecycleListener.java:1073)
	at org.apache.catalina.mbeans.ServerLifecycleListener.propertyChange(ServerLifecycleListener.java:215)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270)
	at org.apache.catalina.core.StandardContext.setCharsetMapper(StandardContext.java:972)
	at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4320)
	at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1065)
	at org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1065)
	at org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:447)
	at org.apache.catalina.core.StandardService.stop(StandardService.java:512)
	at org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
	at org.apache.catalina.startup.Catalina.stop(Catalina.java:601)
	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:585)
	at org.apache.catalina.startup.Bootstrap.stop(Bootstrap.java:287)
	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:585)
	at org.apache.commons.daemon.support.DaemonLoader.stop(DaemonLoader.java:200)
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
ERROR TP-Processor15068 org.apache.jk.common.ChannelSocket - Error,
processing connection
java.lang.NullPointerException
	at org.apache.log4j.Category.isEnabledFor(Category.java:746)
	at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:327)
	at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:616)
	at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:545)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:672)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:595)
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.startup.Catalina - Initialization
processed in 530 ms
INFO main org.apache.catalina.core.StandardService - Starting service Catalina
INFO main org.apache.catalina.core.StandardEngine - Starting Servlet
Engine: Apache Tomcat/5.5.15
INFO main org.apache.catalina.core.StandardHost - XML validation disabled
INFO main org.apache.catalina.storeconfig.StoreLoader - Find registry
server-registry.xml at classpath resource
INFO main org.apache.catalina.startup.Catalina - Server startup in 2225 ms
INFO main org.apache.catalina.core.StandardService - Stopping service Catalina
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.startup.Catalina - Initialization
processed in 567 ms
INFO main org.apache.catalina.core.StandardService - Starting service Catalina
INFO main org.apache.catalina.core.StandardEngine - Starting Servlet
Engine: Apache Tomcat/5.5.15
INFO main org.apache.catalina.core.StandardHost - XML validation disabled
INFO main org.apache.catalina.storeconfig.StoreLoader - Find registry
server-registry.xml at classpath resource
INFO main org.apache.catalina.startup.Catalina - Server startup in 2276 ms
INFO main org.apache.catalina.core.StandardService - Stopping service Catalina
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.core.StandardWrapper - Waiting for 20
instance(s) to be deallocated
INFO main org.apache.catalina.startup.Catalina - Initialization
processed in 659 ms
INFO main org.apache.catalina.core.StandardService - Starting service Catalina
INFO main org.apache.catalina.core.StandardEngine - Starting Servlet
Engine: Apache Tomcat/5.5.15
INFO main org.apache.catalina.core.StandardHost - XML validation disabled
INFO main org.apache.catalina.storeconfig.StoreLoader - Find registry
server-registry.xml at classpath resource
INFO main org.apache.catalina.startup.Catalina - Server startup in 5721 ms

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Re: Multiple problems with Tomcat and Struts

Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Uma,

Uma Kalluru wrote:
> But I am still wondering, if there was connection timeout and the 
> first user gets an error. Why should the whole application go down?

It shouldn't (go down).

> I mean no other user can use the application after the error. Any
> idea on this?

Try setting the validation query for your connection pool and see if
that helps.

- -chris
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Re: Multiple problems with Tomcat and Struts

Posted by Uma Kalluru <um...@gmail.com>.
Hi Chris,

I agree with you on using container managed connection pool. I have
already setup the required configuration to use container connection
pool.

But I am still wondering, if there was connection timeout and the
first user gets an error. Why should the whole application go down? I
mean no other user can use the application after the error. Any idea
on this?

Thanks
Uma

On Dec 13, 2007 3:38 AM, Christopher Schultz
<ch...@christopherschultz.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Uma,
>
> Uma Kalluru wrote:
> > I am using Struts1.x with Tomcat 5.5 and I see lots of problems in the
> > log file. Actually I am using Struts data source manager to create
> > connection pool at the startup of the server.
>
> It's a bit off topic, but you should stop doing that. Struts stopped
> supporting DataSource configuration /years/ ago in favor of
> container-manager data sources.
>
> > The application works fine for some time but after some time the
> > connection object is null. I am not sure how this would happen. Can
> > any one help me out please? This is urgent.
>
> Your pooled database connections are probably timing out. After the
> first error, do you get continuous errors afterward, or do the
> connections reconnect or anything like that?
>
> Your best bet is to configure your data source through Tomcat. See
> http://tomcat.apache.org/tomcat-5.5-doc/jndi-datasource-examples-howto.html
> (specifically, the "Context Configuration" section) for a simple example
> of how to enable container-managed data sources. Just put the <Resource>
> element into your META-INF/context.xml file (you /are/ using a
> META-INF/context.xml file, right?!). Remember to set a "validation
> query" so that connections will be tested for connectivity before they
> are handed over to your application.
>
> - -chris
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.7 (MingW32)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>
> iD8DBQFHYFv49CaO5/Lv0PARAjOpAKCeXoGIO6GN6ASHcRZ1SMU2zXr4fwCeLDCs
> q/80HzjltPsB0Er2AgTqw5s=
> =no2p
> -----END PGP SIGNATURE-----
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>

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Re: Multiple problems with Tomcat and Struts

Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Uma,

Uma Kalluru wrote:
> I am using Struts1.x with Tomcat 5.5 and I see lots of problems in the
> log file. Actually I am using Struts data source manager to create
> connection pool at the startup of the server.

It's a bit off topic, but you should stop doing that. Struts stopped
supporting DataSource configuration /years/ ago in favor of
container-manager data sources.

> The application works fine for some time but after some time the
> connection object is null. I am not sure how this would happen. Can
> any one help me out please? This is urgent.

Your pooled database connections are probably timing out. After the
first error, do you get continuous errors afterward, or do the
connections reconnect or anything like that?

Your best bet is to configure your data source through Tomcat. See
http://tomcat.apache.org/tomcat-5.5-doc/jndi-datasource-examples-howto.html
(specifically, the "Context Configuration" section) for a simple example
of how to enable container-managed data sources. Just put the <Resource>
element into your META-INF/context.xml file (you /are/ using a
META-INF/context.xml file, right?!). Remember to set a "validation
query" so that connections will be tested for connectivity before they
are handed over to your application.

- -chris

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Version: GnuPG v1.4.7 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFHYFv49CaO5/Lv0PARAjOpAKCeXoGIO6GN6ASHcRZ1SMU2zXr4fwCeLDCs
q/80HzjltPsB0Er2AgTqw5s=
=no2p
-----END PGP SIGNATURE-----

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