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Mule Expression Language (MEL)




  • Mule Expression is written in the below format preceded by hash sign '#' 
                  #[message.<payload/inbound/…>]



  • Mule Expression Lang (shortcut on Anypoint Studio : Ctrl+Shift+T)

                -Server (see serverContext Java file)
                -Mule (see MuleInstanceContext Java file)
                -App (see appContext Java file)
                -Message (see MuleMessage Java file)
                -flowVars
                        :they are created to interact within the elements of the same flow
                        :scope lies within the flow and cannot be called outside even when referencing
                -sessionVars
                        :they are created to interact within the running session of the project
                        :not limited to only flows
                        :scope lies within the flow and cannot be called outside even when referencing


  • MEL Versions history
            -MEL was used in Mule 3+ versions
            -DataWeave has taken its place and is preferably used in all Mule 4+ versions.

            -MEL Usages




**Note: I know they are just the bullet points but let me know in comments if you have any doubts regarding the same. I will try my best to answer your queries.
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