IDEA-253605 jvmClassPathUtil: preserve old behaviour

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/util/jvmClasspathUtil.kt

@@ -231,11 +231,7 @@ private fun allRelatedClassLoaders(clsLoader: ClassLoader, visited: MutableSet<C
         return sequenceOf(singleParent).flatMap { allRelatedClassLoaders(it, visited) } + clsLoader
 
     return try {
-        val method = clsLoader.javaClass.getDeclaredMethod("getAllParents") // com.intellij.ide.plugins.cl.PluginClassLoader
+        val arrayOfClassLoaders = getParentClassLoaders(clsLoader)
-        method.isAccessible = true
-
-        @Suppress("UNCHECKED_CAST")
-        val arrayOfClassLoaders = method.invoke(clsLoader) as Array<ClassLoader>
         // TODO: PluginClassLoader uses filtering (mustBeLoadedByPlatform), consider using the same logic, if possible
         // (untill proper compiling from classloader instead of classpath is implemented)
         arrayOfClassLoaders.asSequence().flatMap { allRelatedClassLoaders(it, visited) } + clsLoader
@@ -244,6 +240,38 @@ private fun allRelatedClassLoaders(clsLoader: ClassLoader, visited: MutableSet<C
     }
 }
 
+private fun getParentClassLoaders(clsLoader: ClassLoader): Array<ClassLoader> {
+    return try {
+        getParentsForNewClassLoader(clsLoader)
+    } catch (exception: NoSuchMethodException) {
+        try {
+            getParentsForOldClassLoader(clsLoader)
+        } catch (exception: NoSuchFieldException) {
+            // Possibly idea sources and kotlin compiler had diverged
+            emptyArray()
+        }
+    }
+}
+
+@Throws(NoSuchFieldException::class)
+private fun getParentsForOldClassLoader(clsLoader: ClassLoader): Array<ClassLoader> {
+    // Correct way of getting parents in com.intellij.ide.plugins.cl.PluginClassLoader from IDEA 202 and earlier
+    val field = clsLoader.javaClass.getDeclaredField("myParents") // com.intellij.ide.plugins.cl.PluginClassLoader
+    field.isAccessible = true
+
+    @Suppress("UNCHECKED_CAST")
+    return field.get(clsLoader) as Array<ClassLoader>
+}
+
+@Throws(NoSuchMethodException::class)
+private fun getParentsForNewClassLoader(clsLoader: ClassLoader): Array<ClassLoader> {
+    // Correct way of getting parents in com.intellij.ide.plugins.cl.PluginClassLoader from IDEA 203+
+    val method = clsLoader.javaClass.getDeclaredMethod("getAllParents")
+    method.isAccessible = true
+
+    @Suppress("UNCHECKED_CAST")
+    return method.invoke(clsLoader) as Array<ClassLoader>
+}
 
 internal fun List<File>.takeIfContainsAll(vararg keyNames: String): List<File>? =
     takeIf { classpath ->