Extract urls from any classloader that has getUrls(): List<URL> method

via reflection, e.g. IDEA platform UrlClassloader. This fix allow
kotlin JSR223 host for IDEA to extract classpath from the environment
properly (with appropriate fix on IDEA side as well).

libraries/tools/kotlin-script-util/src/main/kotlin/org/jetbrains/kotlin/script/util/context.kt

@@ -4,6 +4,7 @@ import org.jetbrains.kotlin.script.util.impl.getResourcePathForClass
 import org.jetbrains.kotlin.script.util.impl.toFile
 import java.io.File
 import java.io.FileNotFoundException
+import java.net.URL
 import java.net.URLClassLoader
 import kotlin.reflect.KClass
 import kotlin.script.templates.standard.ScriptTemplateWithArgs
@@ -28,14 +29,24 @@ internal const val KOTLIN_SCRIPT_RUNTIME_JAR_PROPERTY = "kotlin.script.runtime.j
 private val validClasspathFilesExtensions = setOf("jar", "zip", "java")
 
 fun classpathFromClassloader(classLoader: ClassLoader): List<File>? =
-        generateSequence(classLoader) { it.parent }.toList().flatMap {
-            (it as? URLClassLoader)?.urLs?.mapNotNull {
-                // taking only classpath elements pointing to dirs (presumably with classes) or jars, because this classpath is intended for
-                //   usage with the kotlin compiler, which cannot process other types of entries, e.g. jni libs
-                it.toFile()?.takeIf { el -> el.isDirectory || validClasspathFilesExtensions.any { el.extension == it } }
+    generateSequence(classLoader) { it.parent }.toList().flatMap {
+        val urls = (it as? URLClassLoader)?.urLs?.asList()
+            ?: try {
+                // e.g. for IDEA platform UrlClassLoader
+                val getUrls = it::class.java.getMethod("getUrls")
+                getUrls.isAccessible = true
+                val result = getUrls.invoke(it) as? List<Any?>
+                result?.filterIsInstance<URL>()
+            } catch (e: Throwable) {
+                null
             }
-            ?: emptyList()
+        urls?.mapNotNull {
+            // taking only classpath elements pointing to dirs (presumably with classes) or jars, because this classpath is intended for
+            //   usage with the kotlin compiler, which cannot process other types of entries, e.g. jni libs
+            it.toFile()?.takeIf { el -> el.isDirectory || validClasspathFilesExtensions.any { el.extension == it } }
         }
+            ?: emptyList()
+    }.distinct().takeIf { it.isNotEmpty() }
 
 fun classpathFromClasspathProperty(): List<File>? =
         System.getProperty("java.class.path")