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I am having this error from hibernate :
can u help me ?

18:14:46,964 ERROR DiskStore:387 - net.sf.hibernate.cache.QueryCacheCache: Could not write elements to disk cache
java.io.NotSerializableException: org.apache.commons.logging.impl.Log4JLogger at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.writeObject(Unknown Source) at java.util.HashMap.writeObject(Unknown Source) at sun.reflect.GeneratedMethodAccessor2553.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) at java.io.ObjectOutputStream.writeSerialData(Unknown Source) at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.writeObject(Unknown Source) at net.sf.ehcache.store.DiskStore.flushSpool(DiskStore.java:413) at net.sf.ehcache.store.DiskStore.spoolThreadMain(DiskStore.java:385) at net.sf.ehcache.store.DiskStore.access$600(DiskStore.java:83) at net.sf.ehcache.store.DiskStore$SpoolThread.run(DiskStore.java:567)


Hibernate version:

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Name and version of the database you are using:

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

So, are your objects serializable?

Yes all the objects are serializable

Sounds to me like one of your objects has a reference to a log4j Logger object, which is not serializable

well all my persisting object extend Business object wich is serializable
and in that object I have some reference to org.apache.commons.logging.Log.
but the application have been tested and I never seen that error before.

should I remove any logging in this class ?

thanks

S.Shehzad

yes loggers are not serializable by essence

Well they might be, but I don't know any implementation doing so