Converters are for two way conversion.
During rendering all the option values are converted to a string to render the html tag. (NOTE: if wiring is involved, the rendering may also happen in the action request as well to resolve the wiring)
During any (action) form post the current value of the dropdown is converted from a string to the target data type before assigning it to the bound bean property.
#MWS-CAF-Task-Engine#webMethods-BPMS#webMethods