Hello, I use Jboss-Cache version 2.2 and I get the following error: java.lang.Exception: Unknown magic number 57 | at org.jboss.cache.marshall.CacheMarshaller200.unmarshallObject(CacheMarshaller200.java:633) | at org.jboss.cache.marshall.CacheMarshaller200.unmarshallObject(CacheMarshaller200.java:534) | at org.jboss.cache.marshall.CacheMarshaller200.objectFromObjectStream(CacheMarshaller200.java:137) | Also I get: (org.jboss.cache.marshall.VersionAwareMarshaller getMarshaller:304) WARN - () Unknown replication version String. Falling back to the default marshaller installed I put in the cache an ArrayList (I tried with Set) with 12 items (when I put less it works fine). Please help BTW, I am running on Tomcat and in my case there are no Parallel threads. Thanks, Ykahlon View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4217672#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...