where does oozie stores the captured output values of the Java action (or) any action
Oozie's java action stores captured output/exported properties in a property file defined by Hadoop Job attribute: oozie.action.output.properties at runtime. When action completed, the data is then serialized to Oozie's backend data store - Mysql or in-memory db, in table - oozie.WF_ACTIONS, column - data.
The data here is then visible to other actions referring to this java action's output.