Best practice for initialization

Hi,
this must have been covered hundred of times before - nevertheless I didn't find a good answer.
My webapp has to initialize some objects, e.g. load properties from a file, init log4j etc. What's the best place to put these initializations into (static fields and static initialization in one (but which ?) of the servlet classes - or use a singleton, but how to make sure that it's loaded first).
How can I control the sequence in which the classes will be loaded? (Please don't refer to newly introduced features in servlet 2.3 spec - our app server doesn't support it :-(
Thanks,
Stefan

A singleton class would be a good solution. If you do that, it does not matter which servlet is loaded first; the first one that accesses the class will create the object that does the initialization, and subsequent ones will just use that same object.

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Exception below:
2010-02-09 12:40:39.222/88477.977 Oracle Coherence GE 3.4.2/411 <Error> (thread=DistributedCache:StyleCache, member=48): An exception (java.lang.RuntimeException) occurred reading Message AggregateFilterRequest Type=31 for Service=DistributedCache{Name=StyleCache, State=(SERVICE_STARTED), LocalStorage=enabled, PartitionCount=1021, BackupCount=1, AssignedPartitions=201, BackupPartitions=204}
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Bob - Here is the full stacktrace:
2010-02-09 13:04:22.653/90182.274 Oracle Coherence GE 3.4.2/411 <Error> (thread=DistributedCache:StyleCache, member=47): An exception (java.lang.RuntimeException) occurred reading Message AggregateFilterRequest Type=31 for Service=DistributedCache{Name=StyleCache, State=(SERVICE_STARTED), LocalStorage=enabled, PartitionCount=1021, BackupCount=1, AssignedPartitions=205, BackupPartitions=204}
2010-02-09 13:04:22.653/90182.274 Oracle Coherence GE 3.4.2/411 <Error> (thread=DistributedCache:StyleCache, member=47): Terminating DistributedCache due to unhandled exception: java.lang.RuntimeException
2010-02-09 13:04:22.653/90182.274 Oracle Coherence GE 3.4.2/411 <Error> (thread=DistributedCache:StyleCache, member=47):
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     at com.tangosol.io.pof.PortableObjectSerializer.deserialize(PortableObjectSerializer.java:128)
     at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3284)
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Edited by: aidanol on Feb 12, 2010 11:41 AM

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Best-practice for Catalog Views ? :|

Hello community,
A best practice question:
The situtation: I have several product categories (110), several items in those categories (4000) and 300 end-users. I would like to know which is the best practice for segment the catalog. I mean, some users should only see categories 10,20 & 30. Other users only category 80, etc. The problem is how can I implement this ?
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Do you have any idea in order to improve this ?
Saludos desde Mexico,
Diego

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options are : end user / Manager / Functional super users / security team.
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Best practice for initialization

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