Why not to use pageflows for this. It is convenient and works smoothly for me.
Pageflow
.....
| <page name="edit" view-id="/exchange/buy.xhtml">
| <description>qqq</description>
| <redirect/>
| <transition name="save" to="validate"/>
| <transition name="cancel" to="end">
| </transition>
| </page>
|
| <decision name="validate">
| <handler class="org.jboss.seam.drools.DroolsDecisionHandler">
| <workingMemoryName>buyWorkingMemory</workingMemoryName>
| <assertObjects>
| <element>#{exchOrdHome.instance}</element>
| <element>#{facesMessages}</element>
| </assertObjects>
| </handler>
| <transition to="refresh">
| <action expression="#{exchOrdHome.merge}" />
| </transition>
| <transition name="invalid" to="edit"/>
| </decision>
|
| <decision name="refresh" expression="1">
| <transition name="1" to="browse">
| <action expression="#{exchOrdHome.invalidate}" />
| </transition>
| </decision>
| ..........
|
Drools
....
| rule MandatorySum
| when
| $facesMessages : FacesMessages()
| Sum(asFloat<=0)
| then
| $facesMessages.add(new FacesMessage("Sum has to be more than
zero."));
| decision.setOutcome("invalid");
| end
| .....
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