diff --git a/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp b/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp
index 0a8aabf..42284ed 100644
--- a/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp
+++ b/native/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2011, The Android Open Source Project
+ * Copyright (C) 2011, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/com_android_inputmethod_keyboard_ProximityInfo.h b/native/jni/com_android_inputmethod_keyboard_ProximityInfo.h
index f5ccf20..51fa895 100644
--- a/native/jni/com_android_inputmethod_keyboard_ProximityInfo.h
+++ b/native/jni/com_android_inputmethod_keyboard_ProximityInfo.h
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2011, The Android Open Source Project
+ * Copyright (C) 2011, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 8725b0c..71bef93 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2009, The Android Open Source Project
+ * Copyright (C) 2009, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.h b/native/jni/com_android_inputmethod_latin_BinaryDictionary.h
index 0b67e6b..b9e944f 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.h
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.h
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2011, The Android Open Source Project
+ * Copyright (C) 2011, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/com_android_inputmethod_latin_NativeUtils.cpp b/native/jni/com_android_inputmethod_latin_NativeUtils.cpp
index 32d8954..9aae817 100644
--- a/native/jni/com_android_inputmethod_latin_NativeUtils.cpp
+++ b/native/jni/com_android_inputmethod_latin_NativeUtils.cpp
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2012, The Android Open Source Project
+ * Copyright (C) 2012, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/com_android_inputmethod_latin_NativeUtils.h b/native/jni/com_android_inputmethod_latin_NativeUtils.h
index 4d29d7d..d1ffb8f 100644
--- a/native/jni/com_android_inputmethod_latin_NativeUtils.h
+++ b/native/jni/com_android_inputmethod_latin_NativeUtils.h
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2012, The Android Open Source Project
+ * Copyright (C) 2012, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/jni_common.cpp b/native/jni/jni_common.cpp
index 8d7bce7..4eeda1d 100644
--- a/native/jni/jni_common.cpp
+++ b/native/jni/jni_common.cpp
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2011, The Android Open Source Project
+ * Copyright (C) 2011, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -37,11 +36,11 @@
     JNIEnv *env = 0;
     jint result = -1;
 
-    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
+    if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
         AKLOGE("ERROR: GetEnv failed");
         goto bail;
     }
-    assert(env != 0);
+    assert(env);
 
     if (!register_BinaryDictionary(env)) {
         AKLOGE("ERROR: BinaryDictionary native registration failed");
@@ -59,7 +58,7 @@
     }
 
     /* success -- return valid version number */
-    result = JNI_VERSION_1_4;
+    result = JNI_VERSION_1_6;
 
 bail:
     return result;
@@ -70,7 +69,7 @@
 int registerNativeMethods(JNIEnv *env, const char *className, JNINativeMethod *methods,
         int numMethods) {
     jclass clazz = env->FindClass(className);
-    if (clazz == 0) {
+    if (!clazz) {
         AKLOGE("Native registration unable to find class '%s'", className);
         return JNI_FALSE;
     }
diff --git a/native/jni/jni_common.h b/native/jni/jni_common.h
index 32f9fa9..771361d 100644
--- a/native/jni/jni_common.h
+++ b/native/jni/jni_common.h
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2011, The Android Open Source Project
+ * Copyright (C) 2011, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/src/bigram_dictionary.cpp b/native/jni/src/bigram_dictionary.cpp
index 4f5493a..8dc21220 100644
--- a/native/jni/src/bigram_dictionary.cpp
+++ b/native/jni/src/bigram_dictionary.cpp
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2010, The Android Open Source Project
+ * Copyright (C) 2010, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/src/debug.h b/native/jni/src/debug.h
index 2fee6e8..2168d66 100644
--- a/native/jni/src/debug.h
+++ b/native/jni/src/debug.h
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2011, The Android Open Source Project
+ * Copyright (C) 2011, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/native/jni/src/defines.h b/native/jni/src/defines.h
index 05b997d..e172b04 100644
--- a/native/jni/src/defines.h
+++ b/native/jni/src/defines.h
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2010, The Android Open Source Project
+ * Copyright (C) 2010, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -96,7 +95,7 @@
     }
     if (all == 0) all = 1;
     for (int i = 0; i < PROF_BUF_SIZE - 1; ++i) {
-        if (profile_buf[i] != 0) {
+        if (profile_buf[i]) {
             AKLOGI("(%d): Used %4.2f%%, %8.4f ms. Called %d times.",
                     i, (profile_buf[i] * 100 / all),
                     profile_buf[i] * 1000 / (float)CLOCKS_PER_SEC, profile_counter[i]);
diff --git a/native/jni/src/dictionary.cpp b/native/jni/src/dictionary.cpp
index 4703a38..dabd98b 100644
--- a/native/jni/src/dictionary.cpp
+++ b/native/jni/src/dictionary.cpp
@@ -1,5 +1,4 @@
 /*
- *
  * Copyright (C) 2009, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/native/jni/src/unigram_dictionary.cpp b/native/jni/src/unigram_dictionary.cpp
index b121d08..ce3108b 100644
--- a/native/jni/src/unigram_dictionary.cpp
+++ b/native/jni/src/unigram_dictionary.cpp
@@ -1,6 +1,5 @@
 /*
- *
- * Copyright 2010, The Android Open Source Project
+ * Copyright (C) 2010, The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.