Looks like "execute" might be the new way, per
but it seems my JBossIDE for Eclipse doesn't know yet. Cached Schema from how long ago?
now uses execute instead of expression.
Per reference documentation it seem though pageflow-definition is still using expression.
yes, its better to disable schema caching in eclipse unless you really need it.
We have a jira issue open with jbpm to change their <action expression to <action execute for consistency.