Java custom types doesn't propagate generic arguments.

Given simple newtype like

struct Outer {
  ListMap env;
};

newtype ListMap = Vector<KeyValuePair>;

and custom type:

annotation ListMap JavaCustomType {
  "javaname" : "java.util.Map<String, String>",
  "helpers" : "au.com.helixta.adl.custom.ListMapHelpers"
};

generated java code for Outer contains just Map instead of Map<String, String>

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