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From "Alistair Forbes" <forbes...@googlemail.com>
Subject Re: Remote cache class cast exception
Date Mon, 29 May 2006 23:33:27 GMT
It took sometime to get back to this. I am using the latest version:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.5.3
Created-By: Apache Maven
Built-By: SG0894751
Package: org.apache.jcs
Build-Jdk: 1.3.1_16
Extension-Name: jcs
Specification-Title: Cache
Specification-Vendor: Apache Software Foundation
Implementation-Title: org.apache.jcs
Implementation-Vendor: Apache Software Foundation
Implementation-Version: 1.2.7.3

The message logged is identical for both the IOException and the Exception,
which makes it difficult to see what causes the exception.

90% of the time I only get the text without the stack trace, which makes me
think this is from two different exceptions. This only seems to happen when
using a remote cache - and I suspect the problem is triggered by a restart
of a client cache, but I am not 100% sure yet.

"01:25:51,735 ERROR [IndexedDiskCache] Failure getting from disk, cacheName:
testCache, key = KEY23145
java.lang.ClassCastException"

Maybe you could change the exception so that I can see which exception is
triggered.

Index: org/apache/jcs/auxiliary/disk/indexed/IndexedDiskCache.java
===================================================================
--- org/apache/jcs/auxiliary/disk/indexed/IndexedDiskCache.java (revision
410163)
+++ org/apache/jcs/auxiliary/disk/indexed/IndexedDiskCache.java (working
copy)
@@ -490,7 +490,7 @@
         }
         catch ( IOException ioe )
         {
-            log.error( "Failure getting from disk, cacheName: " + cacheName
+ ", key = " + key, ioe );
+            log.error( "IO Failure getting from disk, cacheName: " +
cacheName + ", key = " + key, ioe );
             reset();
         }
         catch ( Exception e )



On 4/27/06, Aaron Smuts <asmuts@yahoo.com> wrote:
>
> Sorry if I missed it, but what version are you using.
>
>
> --- Alistair Forbes <forbes.al@googlemail.com> wrote:
>
> > Here's the full stack trace from the remote server:
> >
> > java.lang.ClassCastException:
> > org.apache.jcs.engine.CacheElementSerialized
> >         at
> >
> org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCache.readElement(
> > IndexedDiskCache.java:526)
> >         at
> >
> org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCache.doGet(
> > IndexedDiskCache.java:484)
> >         at
> > org.apache.jcs.auxiliary.disk.AbstractDiskCache.get(
> > AbstractDiskCache.java:298)
> >         at
> > org.apache.jcs.engine.control.CompositeCache.get(
> > CompositeCache.java:495)
> >         at
> > org.apache.jcs.engine.control.CompositeCache.get(
> > CompositeCache.java:398)
> >         at
> >
> org.apache.jcs.auxiliary.remote.server.RemoteCacheServer.get(
> > RemoteCacheServer.java:554)
> >         at
> > sun.reflect.GeneratedMethodAccessor5.invoke(Unknown
> > Source)
> >         at
> > sun.reflect.DelegatingMethodAccessorImpl.invoke(
> > DelegatingMethodAccessorImpl.java:25)
> >         at
> > java.lang.reflect.Method.invoke(Method.java:585)
> >         at
> >
> sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java
> > :294)
> >         at
> >
> sun.rmi.transport.Transport$1.run(Transport.java:153)
> >         at
> > java.security.AccessController.doPrivileged(Native
> > Method)
> >         at
> >
> sun.rmi.transport.Transport.serviceCall(Transport.java:149)
> >         at
> > sun.rmi.transport.tcp.TCPTransport.handleMessages(
> > TCPTransport.java:460)
> >         at
> >
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(
> > TCPTransport.java:701)
> >         at java.lang.Thread.run(Thread.java:595)
> >
> >
> > On 4/26/06, Alistair Forbes
> > <forbes.al@googlemail.com> wrote:
> > >
> > > I could try the latest version - but I have not
> > had time to check the last
> > > changes to the RMI timeouts. But it's pretty
> > recent.
> > >
> > > The remote server has access to all the
> > application classes.
> > >
> > > What is strange is that this only happens on 2 out
> > of 8 regions, and for
> > > one of these the class is really simple.
> > >
> > > For the logging...strange, but only the one line
> > is logged. I will check
> > > the log4j pattern that I have.
> > >
> > > Let me try the latest of everything and see that
> > happens.
> > >
> > >
> > >
> > > On 4/26/06, Smuts, Aaron
> > <Aaron.Smuts@travelocity.com> wrote:
> > > >
> > > > What version of JCS are you using?
> > > >
> > > > The error is happening on the remote server's
> > disk cache?
> > > >
> > > > In the latest versions, the remote server is
> > passed a byte array instead
> > > > of your object.  If passed the object, then the
> > remote server would have
> > > >
> > > > to have your code.
> > > >
> > > > The full log message is only 3 lines?  The
> > commons logging api prints a
> > > > stack trace when you pass in an exception as the
> > second argument.
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: Alistair Forbes
> > [mailto:forbes.al@googlemail.com]
> > > > > Sent: Wednesday, April 26, 2006 9:19 AM
> > > > > To: JCS Users List
> > > > > Subject: Remote cache class cast exception
> > > > >
> > > > > From the logs of the Remote server I get class
> > cast excepetions.
> > > > >
> > > > > I have tried serializing the objects to disk,
> > and these all seem to
> > > > work.
> > > > > Is
> > > > > there a simple way to generate the fully stack
> > trace?
> > > > >
> > > > > I log4j I thought the line below would
> > generate a full stack trace,
> > > > but
> > > > > maybe this is different in Commons logging.
> > > > >
> > > > >        catch ( IOException ioe )
> > > > >         {
> > > > >             log.error( "Failure getting from
> > disk, cacheName: " +
> > > > > cacheName
> > > > > + ", key = " + key, ioe );
> > > > >             reset();
> > > > >         }
> > > > >
> > > > >
> > > > > 15:09:24,459 ERROR [IndexedDiskCache] Failure
> > getting from disk,
> > > > > cacheName:
> > > > > textCache, key = XXXYYY
> > > > > java.lang.ClassCastException
> > > > >
> > > > >
> > > > > Any hints appreciated.
> > > > > Al
> > > >
> > > >
> >
> ---------------------------------------------------------------------
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> > > > For additional commands, e-mail:
> > jcs-users-help@jakarta.apache.org
> > > >
> > > >
> > >
> >
>
>
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