title: Best way to implement Spring's Converter interface when you need to pass multiple types as source
body: <p>You often need to make a target object from a bunch of source ones.</p>
  
  <p>I know the only one option - to make an upper-level synthetic class which contains required types as its fields and pass it as a source to Spring Converter. But maybe it's possible to do it easier?</p>
  
  <p>Thanks in advance.</p>