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From "Alistair Forbes" <forbes...@googlemail.com>
Subject Re: Remote cache class cast exception
Date Tue, 30 May 2006 07:58:55 GMT
With the latest source from svn I get the following exception from the
RemoteCacheServer: The server does have access to the same classpath as the
application. The object is serializable as I can read and write the
serialized object to disk. Any hints appreciated.


09:47:56,414 ERROR [IndexedDiskCache] Failure getting from disk, cacheName:
ruleCache, key = 34800JR2OS12
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:488)
        at org.apache.jcs.engine.control.CompositeCache.get(
CompositeCache.java:391)
        at org.apache.jcs.auxiliary.remote.server.RemoteCacheServer.get(
RemoteCacheServer.java:546)
        at sun.reflect.GeneratedMethodAccessor7.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 5/30/06, Alistair Forbes <forbes.al@googlemail.com> wrote:
>
> 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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> > > jcs-users-help@jakarta.apache.org
> > > > >
> > > > >
> > > >
> > >
> >
> >
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> >
> >
>

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