a c++11 wrapper for the jni library
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JniObject is a C++11 class that simplifyies the communication between C++ and java using the jni library.

Using jni directly to call a method and pass a string argument is something like this:

JNIEnv* env; 
java->GetEnv(&env, JNI_VERSION_1_4);
jobject obj;
jclass cls = env->GetObjectClass(env, obj);
jmethodID mid = env->GetMethodID(env, cls, "MethodName", "(Ljava/lang/String;)V");
jstring javaString = env->NewStringUTF(nativeString.c_str());
env->CallVoidMethod(obj, mid, javaString);

With JniObject it's as simple as this:

JniObject obj;
obj.callVoid("MethodName", nativeString);

Some of the features of the class include:

  • automatic method signature deduction
  • automatic singleton references
  • java object creation
  • methods that return other java objects
  • multithreading support
  • conversion from std::string to java String
  • conversion from std::vector to and from java arrays and List
  • conversion from std::map to and from java Map

Read this blog post for a more in depth look into it.