Since PojoCache builds on plain JBossCache, so make sure you have plain JBossCache running properly first. Here is the page.
If you still have trouble.
Make sure the tutorial works first.
Run through the examples directory under the distribution making sure they work.
Turn on the log4j category: org.jboss.cache.aop and look for putObject, removeobject, and getObject.
If you have trouble doing replication, look for _replicate in the log. You should see it tried to perform a method call with various opertaions.
If you putObject succeeds, but fine-grained replication, when you do a field update, try to look in the log for any put operation. For example, if you do pojo.setName("Taipei"), it should be underneath put(..., "Taipei") for fine-grained replication.
If everything elses, please report it to the forum.