Fix class name format for jniThrowExceptionFmt

Change-Id: I25d087b23294f00f7cd6d38add79bb15aaa8f0fb
diff --git a/src/dalvik_system_DexFile.cc b/src/dalvik_system_DexFile.cc
index 977abc8..5905642 100644
--- a/src/dalvik_system_DexFile.cc
+++ b/src/dalvik_system_DexFile.cc
@@ -122,7 +122,7 @@
   const std::string descriptor = DotToDescriptor(class_name);
   const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor);
   if (dex_class_def == NULL) {
-    jniThrowExceptionFmt(env, "Ljava/lang/NoClassDefFoundError;", "Class %s not found", class_name);
+    jniThrowExceptionFmt(env, "java/lang/NoClassDefFoundError", "Class %s not found", class_name);
     return NULL;
   }