No need to check the class type.

Author: emacarron

src/main/java/org/apache/ibatis/scripting/LanguageDriverRegistry.java

@@ -31,9 +31,6 @@ public void register(Class<?> cls) {
     if (cls == null) {
       throw new IllegalArgumentException("null is not a valid Language Driver");
     }
-    if (!LanguageDriver.class.isAssignableFrom(cls)) {
-      throw new ScriptingException(cls.getName() + " does not implement " + LanguageDriver.class.getName());
-    }
     LanguageDriver driver = LANGUAGE_DRIVER_MAP.get(cls);
     if (driver == null) {
       try {
@@ -49,9 +46,6 @@ public void register(LanguageDriver instance) {
     if (instance == null) {
       throw new IllegalArgumentException("null is not a valid Language Driver");
     }
-    if (!LanguageDriver.class.isAssignableFrom(instance.getClass())) {
-      throw new ScriptingException(instance.getClass().getName() + " does not implement " + LanguageDriver.class.getName());
-    }
     LanguageDriver driver = LANGUAGE_DRIVER_MAP.get(instance.getClass());
     if (driver == null) {
       LANGUAGE_DRIVER_MAP.put(instance.getClass(), driver);