jni jnienv GetSuperclass example c c++ java

GetSuperclass

jclass GetSuperclass(JNIEnv *env, jclass clazz);

If clazz represents any class other than the class Object, then this function returns the object that represents the superclass of the class specified by clazz.

If clazz specifies the class Object, or clazz represents an interface, this function returns NULL.

LINKAGE:

Index 10 in the JNIEnv interface function table.

PARAMETERS:

env: the JNI interface pointer.

clazz: a Java class object.

RETURNS:

Returns the superclass of the class represented by clazz, or NULL.

Example - GetSuperClass
+
+/*
+ * Class:     java_lang_JNITest
+ * Method:    getSuperclass
+ * Signature: (Ljava/lang/Class;)Ljava/lang/Object;
+ */
+JNIEXPORT jobject JNICALL Java_java_lang_JNITest_getSuperclass(JNIEnv *env, jclass clazz, jclass childClazz)
+{
+        return (*env)->GetSuperclass(env, childClazz);
+}
diff --git a/vm/jni-interface.c b/vm/jni-interface.c
index 345f000..9eb6e38 100644
--- a/vm/jni-interface.c
+++ b/vm/jni-interface.c
@@ -32,6 +32,7 @@

 #include "lib/guard-page.h"

+#include "runtime/java_lang_VMClass.h"
 #include "vm/call.h"
 #include "vm/class.h"
 #include "vm/classloader.h"
@@ -354,8 +355,7 @@ static jobject JNI_ToReflectedMethod(JNIEnv *env, jclass clazz, jmethodID method

 static jclass JNI_GetSuperclass(JNIEnv *env, jclass clazz)
 {
-        JNI_NOT_IMPLEMENTED;
-        return 0;
+        return (jclass) java_lang_VMClass_getSuperclass(clazz);
 }

 static jboolean JNI_IsAssignableFrom(JNIEnv *env, jclass clazz1, jclass clazz2)
-- 
1.7.5.1