1 files changed, 14 insertions, 2 deletions
diff --git a/android/arch/lifecycle/ClassesInfoCache.java b/android/arch/lifecycle/ClassesInfoCache.java
index f077daed..d88e2762 100644
--- a/android/arch/lifecycle/ClassesInfoCache.java
+++ b/android/arch/lifecycle/ClassesInfoCache.java
@@ -46,7 +46,7 @@ class ClassesInfoCache {
             return mHasLifecycleMethods.get(klass);
         }
 
-        Method[] methods = klass.getDeclaredMethods();
+        Method[] methods = getDeclaredMethods(klass);
         for (Method method : methods) {
             OnLifecycleEvent annotation = method.getAnnotation(OnLifecycleEvent.class);
             if (annotation != null) {
@@ -64,6 +64,18 @@ class ClassesInfoCache {
         return false;
     }
 
+    private Method[] getDeclaredMethods(Class klass) {
+        try {
+            return klass.getDeclaredMethods();
+        } catch (NoClassDefFoundError e) {
+            throw new IllegalArgumentException("The observer class has some methods that use "
+                    + "newer APIs which are not available in the current OS version. Lifecycles "
+                    + "cannot access even other methods so you should make sure that your "
+                    + "observer classes only access framework classes that are available "
+                    + "in your min API level OR use lifecycle:compiler annotation processor.", e);
+        }
+    }
+
     CallbackInfo getInfo(Class klass) {
         CallbackInfo existing = mCallbackMap.get(klass);
         if (existing != null) {
@@ -106,7 +118,7 @@ class ClassesInfoCache {
             }
         }
 
-        Method[] methods = declaredMethods != null ? declaredMethods : klass.getDeclaredMethods();
+        Method[] methods = declaredMethods != null ? declaredMethods : getDeclaredMethods(klass);
         boolean hasLifecycleMethods = false;
         for (Method method : methods) {
             OnLifecycleEvent annotation = method.getAnnotation(OnLifecycleEvent.class);