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From Joel Spotts <jspo...@us.ibm.com>
Subject Re: Safe shutdown
Date Wed, 30 May 2007 12:03:03 GMT

I should probably go into more detail the issue we are having:

We are wrapping Geronimo in a windows service using JavaService
(http://forge.objectweb.org/projects/javaservice/). It is similar to Java
Service Wrapper. You can specify the java class path as a systme property
when the application the service wraps startsup and shuts down. You also
provide the start class as well as optionally the stop class. You can only
provide one classpath -- to be used for the start class as well as the stop
class. So we configure the start class as
org.apache.geronimo.system.main.Daemon and for the stop class:
org.apache.geronimo.deployment.cli.StopServer. In order for that stop
method to be on the classpath we configure the classpath as follows:

bin/server.jar;bin/shutdown.jar. If we leave out shutdown.jar, the
StopServer.jar is missing.

So far so good, and that works out ok, but here is the rub: hot deployment
will not work. We get the dreaded ClassNotFOundException:

Exception in thread "Geronimo hot deploy scanner"
java.lang.NoClassDefFoundError:
org/apache/geronimo/deployment/plugin/ConfigIDExtractor
      at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
      at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
      at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
      at
org.apache.geronimo.kernel.config.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:227)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
      at
org.apache.geronimo.kernel.config.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:227)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
      at
org.apache.geronimo.kernel.config.MultiParentClassLoader.loadClass(MultiParentClassLoader.java:227)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
      at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
      at
org.apache.geronimo.deployment.hot.DirectoryMonitor.calculateModuleId(DirectoryMonitor.java:358)
      at
org.apache.geronimo.deployment.hot.DirectoryMonitor.initialize(DirectoryMonitor.java:230)
      at
org.apache.geronimo.deployment.hot.DirectoryMonitor.run(DirectoryMonitor.java:206)
      at java.lang.Thread.run(Thread.java:619)

There seems to be some sort of class loader clash.

Now, if we remove the server.jar from the classpath, hot deployment works
just fine, but of course we can't use the shutdown class then. That
prompted my original question. The JavaService states:
If no stop_class is specified, the process containing the Virtual Machine
is simply terminated when the service is stopped.

I do notice much less logging when removing the stop class, so it seems
like the shutdown hooks are not called.

So do I have any options to get both the shutdown hook and hot deployment?

Thanks,

Yoel Spotts


                                                                           
             David Jencks                                                  
             <david_jencks@yah                                             
             oo.com>                                                    To 
                                       user@geronimo.apache.org            
             05/29/2007 07:18                                           cc 
             PM                                                            
                                                                   Subject 
                                       Re: Safe shutdown                   
             Please respond to                                             
             user@geronimo.apa                                             
                  che.org                                                  
                                                                           
                                                                           
                                                                           





On May 29, 2007, at 3:09 PM, Mark Aufdencamp wrote:

      I would guess this probably depends on your application, but it
      doesnt sound like a good idea.  I would think that an EJB container
      would need to be able to safely complete transactions and
      passivate/deallocate it's Beans particular CMP Entity Beans.  The Web
      container might also maintain Application scoped information that
      needs a clean safe shutdown as well.

However, both the shutdown jar or console command and hitting ctrl-c on
your console have approximately the same effect in code -- calling the
shutdown hook that stops and unloads all the running configurations in
reverse order of their starting.    If your application uses transactions
properly any kind of shutdown shouldn't result in data corruption, but you
may lose partially computed results in process.  We don't make any attempt
I'm aware of to finish processing in flight requests before turning off a
gbean.

thanks
david jencks

      Mark Aufdencamp
      Mark@Aufdencamp.com


       -------- Original Message --------
       Subject: Safe shutdown
       From: Joel Spotts <jspotts@us.ibm.com>
       Date: Tue, May 29, 2007 5:05 pm
       To: user@geronimo.apache.org

       Is there any danger in stopping geronimo by simply killing the
       application as opposed to running the shutdown.jar or shutdown.bat?
       For various reasons (which I can get into if the answer is that it
       is not safe) I cannot easily stop the server with the shutdown tool.

       Thanks,

       Yoel Spotts

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