We are currently using Mule ESB Community version and looking for techniques to transform messages from one format to another. We have tried XSLT for XML mapping. Java object mapping and Dozer mappings so far.We deal with XML, FLAT,Json messages.Would like to know if there are more options which are visually easy to map and maintain?
It depends on your requirement ... For XML mapping XSLT is a good choice,in some cases you can also map elements of XML using XPATH
For JSON you first need to parse the payload with JSON to Object transformer and then you can map with each JSON element
But if you want any other option than these transformer, then I will suggest Datamapper, which can map and transform almost all type of payload starting from XML, JSON, POJO, flat files and it is also graphically supported as you mentioned in your requirement...
but again it is not available in Community edition and only feature of Enterprise edition:-
http://www.mulesoft.org/documentation/display/current/Datamapper+User+Guide+and+Reference