During the initialization of the classloader, we preload some jar files, that are necessary for the compiler to work correctly. In this process of preloading classes, we unpack each jar file and look at the value of the Class-Path in its META_INF. So we will determine, which files are depends on by original jars. We will load the resulting jars in the next iteration of class preloading. Thus, we get nested classloaders. However, in practice, it turned out that the jar files needed for the second iteration were already loaded in the first iteration, so there is no point in loading them again. Moreover, if we do not find the class in the first loader, then we will not find it in the second either. However, the case, when there are some jars from Class-Path of original jars and they were not loaded by first iteration, does not change.
Aldo needed for KT-49786
Aleksei.Cherepanov
8c3b1dc55a