I am using JBM-5.2.0-SNAPSHOT with Oracle10g and Hibernate 3.6.0.Final.
Task Service was throwing a java.lang.ClassCastException: $Proxy88 cannot be cast to oracle.sql.CLOB while saving the task.
I had to modify the source for org.jbpm.task.I18NText to include the StringClobType (Didn't try the MaterializedClobType but I guess that would work too)
@Lob
@Type(type = "org.hibernate.type.StringClobType")
private String text;
Would be great to use a hibernate text instead of Lob.
Regards
--K