When is synchronization required?

My application runs a number of threads inside a Tomcat server, each of which is updating a replicated cache (checking for pre-existing entries in some cases).
I have been getting irregular problems in the classloader - apparently due to what seem to be scrambled class names (see below - edited slightly).
(Wrapped)
java.io.IOException: Class initialization failed: java.lang.ClassNotFoundException: 14714277.rest.of.class.Name <=== corrupted!!
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1332)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at com.tangosol.util.ExternalizableHelper.loadClass(ExternalizableHelper.java:1887)
at com.tangosol.util.ExternalizableHelper.readExternalizableLite(ExternalizableHelper.java:1480)
at com.tangosol.util.ExternalizableHelper.readXmlBean(ExternalizableHelper.java:1556)
at com.tangosol.util.ExternalizableHelper.readObject(ExternalizableHelper.java:1746)
at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:187)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$ConverterFromBinary.convert(DistributedCache.CDB:4)
at com.tangosol.util.ConverterCollections$ConverterMap.put(ConverterCollections.java:1317)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$ViewMap.put(DistributedCache.CDB:1)
at com.tangosol.coherence.component.util.SafeNamedCache.put(SafeNamedCache.CDB:1)
at [... CUT HERE...]
I have tried putting coherence locks in place but with no impact - in fact the only thing which seems to make a difference is to synchronize all my calls to the NamedCache - but even this is not completely sufficient (i.e. problems still occur, just less frequently).
I realise that this may be a problem in my code (though I can't really see how).
Do you have any suggestions? Is access to the cache meant to be synchronized?
Thanks (for this and all the previous help!)

I have seen a similar problem (using Coherence 3.0.0 build 315) :
java.io.IOException: Class initialization failed: java.lang.ClassNotFoundException: No ClassLoaders found for: 10.120.45.rest.of.class.Name <=== <b>corrupted!!</b>
     at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:198)
     at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:464)
     at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:374)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:164)
     at com.tangosol.util.ExternalizableHelper.loadClass(ExternalizableHelper.java:1887)
     at com.tangosol.util.ExternalizableHelper.readExternalizableLite(ExternalizableHelper.java:1480)
     at com.tangosol.util.ExternalizableHelper.readXmlBean(ExternalizableHelper.java:1556)
     at com.tangosol.util.ExternalizableHelper.readObject(ExternalizableHelper.java:1746)
     at com.tangosol.run.xml.XmlSerializableAdapter.readExternal(XmlSerializableAdapter.java:163)
     at com.tangosol.run.xml.XmlBean.readExternal(XmlBean.java:687)
     at com.tangosol.util.ExternalizableHelper.readExternalizableLite(ExternalizableHelper.java:1492)
     at com.tangosol.util.ExternalizableHelper.readXmlBean(ExternalizableHelper.java:1556)
     at com.tangosol.util.ExternalizableHelper.readObject(ExternalizableHelper.java:1746)
     at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:187)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$ConverterFromBinary.convert(DistributedCache.CDB:4)
     at com.tangosol.util.ConverterCollections$ConverterMap.get(ConverterCollections.java:1300)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.DistributedCache$ViewMap.get(DistributedCache.CDB:1)
     at com.tangosol.coherence.component.util.SafeNamedCache.get(SafeNamedCache.CDB:1)
     at com.tangosol.coherence.component.util.collections.WrapperMap.get(WrapperMap.CDB:1)
When I have looked closely at the data, this seems to occur when there is a null value in a Map that is being serialised/deserialised using an XmlBean.
The "10.120.45." above which has overridden part of the fully qualified class name can actually be found in the data that is being (de)serialised.
So far this appears to be a problem in 2 out of more than 250,000 objects that we have processed (in one day), so it is a problem in our data and our handling of it, which we will fix ourselves.
However, it is a concern that nulls like this cause problems with (de)serialisation in Coherence.
Are null values in Maps supported for serialisation/deserialisation via XmlBean? Are null values in general supported for (de)serialisation via XmlBean?
Have you seen this problem before? Are you able to fix it?
Thanks,
Rohan

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