Since useAnt has been removed from CompileOptions, what's the best way to compile Java sources relying on internal Sun classes?

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I’m compiling some generated Java code that relies on something it probably shouldn’t:

import com.sun.xml.internal.fastinfoset.sax.Properties;

Gradle using Ant knows how to compile this; when relying on the generated ‘build.xml’ the ‘compileJava’ task succeeds. But when I try without Ant: ‘’’ package com.sun.xml.internal.fastinfoset.sax does not exist ‘’’

Searching around I see some old advice to pass the ‘useAnt’ option to the task, but I think that was removed by commit 818e0b9995d930801fd1b7147fec68f37c23cfe7. However some documentation still refers to ‘useAnt’, and I can’t find another way to achieve the same effect.

I understand that this is all deprecated behavior, but since I want to use Gradle for this generated code without modifying it, I think I need to find a way.

Thank you.