[logback-user] What would cause "java.lang.NoClassDefFoundError: ch/qos/logback/classic/spi/ThrowableProxy" in long running daemon

[Fred Toth]

Hi David,

For better or worse, these particular apps are on one of these modern 
disk systems where EVERYTHING is an NFS mount. Supposed to "just work", 
you know.

Thanks,
Fred

On 8/31/15 6:55 AM, David Roussel wrote:
> Are you storing your jar files on the NFS mounts?
>
> Seem like a bad idea if you are.  If a network error causes an exception, and the exception handler calls a class that has not been loaded yet, the class loader will try to load it.
>
> The network is unreliable, you must be able to handle network failures.
>
> If you are using NFS for ease of deployment, say for batch jobs, there is another way.
>
> David
>
>> On 30 Aug 2015, at 01:58, Fred Toth <ftoth at synernet.com> wrote:
>>
>> Hi,
>>
>> We have multiple production processes that run 24 hours a day, 7 days a week. All use slf4j/logback and recently we had several of these (seemingly coincidentally) spew:
>>
>> java.lang.NoClassDefFoundError: ch/qos/logback/classic/spi/ThrowableProxy
>>
>> These are long running processes where nothing has changed recently. Obviously the logback jars are available, in the right place, etc.
>>
>> I'm stumped. There are some hints of some possible system related problem (like missing NFS mount, possibly).
>>
>> Does logback dynamically load the above class? Again, this error is out of the blue, from a process that may have been running for days or weeks.
>>
>> Any ideas?
>>
>> We're using version logback 1.0.13.
>>
>> If I google the above, there are some references to "Spring Boot" which we are not using. However, we are using Spring Integration, in case that matters.
>>
>> Any ideas?
>>
>> Thanks,
>> Fred
>>
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