hboutemy commented on issue #163: [MNG-6401] - Cannot interpolate property in proxy port of settings.xml URL: https://github.com/apache/maven/pull/163#issuecomment-390640786 on String interpolation vs Object interpolation: String based interpolation was replaced by Object interpolation a few years ago (perhaps during the switch from Maven 2 to Maven 3, I need to get precise facts if necessary): I don't precisely know why (is Object interpolation more robust, against XML injection?) what I see in this precise case of proxy port interpolation: it's an int, then it's hard to do Object interpolation on "${param}" value once it has been transfrmed to a String... at least, this give us the good root cause: if we want interpolation with Object implementation, we need to change the field type to String I know that we have such a case with booleans, where we do not put the effective field type in the descriptor but String for more flexibility: in this boolean case, it was about inheritance, to make the difference between inheriting and overriding with a value. Then there is a hand-written getter to get the field as boolean (instead of the internal String) I don't know if we have such cases in Maven core with ints, but the previous pattern hand-writing a typed getter to int should do the job. Now what's the best solution for now: - switch back to String based interpolation instead of Object interpolation? - change the field from int to String and add the hand-written getter? at this time, I don't have strong opinion: I wanted to write and share the analysis. Now I need to dig into the reasons why we switched from String based interpolation to Object based: this is where we should find the best view on what issue could arise when getting back to former solution
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