Hi Charles,
For executing a model,
1)First u need to create a model and then add the existing model in the Data Modeler(diagram).
2) Then right click on Component controller-->click on Apply template >click on Service Controller>select the Bapi method-->select the output and input parameters for context.
Then a method will be created in the Controller with ExecuteBapiInputName.
3) All what you have to do is just call this method from view controller
wdThis.wdGet<<Controllername>>.executeBapi<<metname>>
This will populate the data in to your node(see that the context of component controller is mapped with view controller).
Thats it and regarding Java Knowledge, you need Java knowledge to manipulate (Get & Set) that data coming from back end and knowledge of writing methods to perform certain functionalities.
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