Looks like your class path is setup wrong - suspect you have different version dependency jars.

Mark
On 18 Oct 2012, at 17:44, TonyN <tony.n.nguyen@boeing.com> wrote:

com.boeing.irip.app.service.BA5_DroolsHttpServer.main(BA5_DroolsHttpServer.java:443)
Caused by: java.io.InvalidClassException:
org.drools.rule.MVELDialectRuntimeData; local class incompatible: stream
classdesc serialVersionUID = 5166066541265170937, local class
serialVersionUID = -64624826351992706
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:562)