JDIEval: allow classLoader to be null (load class from caller classloader)

eval4j/src/org/jetbrains/eval4j/jdi/jdiEval.kt

@@ -29,7 +29,7 @@ val BOOTSTRAP_CLASS_DESCRIPTORS = setOf("Ljava/lang/String;", "Ljava/lang/ClassL
 
 public class JDIEval(
         private val vm: jdi.VirtualMachine,
-        private val classLoader: jdi.ClassLoaderReference,
+        private val classLoader: jdi.ClassLoaderReference?,
         private val thread: jdi.ThreadReference,
         private val invokePolicy: Int
 ) : Eval {
@@ -53,6 +53,18 @@ public class JDIEval(
                 return loadedClass.classObject().asValue()
             }
         }
+        if (classLoader == null) {
+            return invokeStaticMethod(
+                    MethodDescription(
+                            CLASS.getInternalName(),
+                            "forName",
+                            "(Ljava/lang/String;)Ljava/lang/Class;",
+                            true
+                    ),
+                    listOf(vm.mirrorOf(classType.getInternalName().replace('/', '.')).asValue())
+            )
+        }
+        else {
             return invokeStaticMethod(
                     MethodDescription(
                             CLASS.getInternalName(),
@@ -67,6 +79,7 @@ public class JDIEval(
                     )
             )
         }
+    }
 
     override fun loadString(str: String): Value = vm.mirrorOf(str).asValue()