Android JNI pipe always waiting in FileReader

Question

I am trying to communicate with JNI with java using pipe I tried this.

my JNI

void createPipe(std::string path){

    //pipe test

    const char* PATH = path.c_str();
    char* line = "Hello Pipe!";
    int pipe;
    int fd;
    errno = 0;
    __android_log_write(ANDROID_LOG_ERROR, "NDK_FOO_TAG 0", PATH);
    // open a named pipe
    mode_t mode = S_IRWXU | S_IRWXG | S_IRWXO;
    pipe = mkfifo(PATH, mode);
    if(errno != 0) {
        __android_log_write(ANDROID_LOG_ERROR, "NDK_FOO_TAG 1", strerror(errno));
       //fd = open(PATH, O_WRONLY);
    }
    __android_log_write(ANDROID_LOG_DEBUG, "NDK_FOO_TAG", "file opened successfully");

    // actually write out the data and close the pipe
    int err = write(pipe, line, strlen(line));
    __android_log_write(ANDROID_LOG_DEBUG, "NDK_FOO_TAG Success",strerror(errno));

    // close the pipe
    close(pipe);

    //-----------
}

Native call

extern "C"
JNIEXPORT void JNICALL
Java_com_mynative_library_minterface_InitPipe(JNIEnv *env, jobject instance,
                                                    jstring pipePath_) {
    const char *pipePath = env->GetStringUTFChars(pipePath_, 0);
    createPipe(pipePath);

    // TODO

    env->ReleaseStringUTFChars(pipePath_, pipePath);
}

JAVA

private void pipeRead(){
        try{
            // Reader reader = new FileReader(PATH);
            FileReader mReader = new FileReader(FIFO_PATH);
            System.out.println("NativeCommunicator Started pipe reader waiting .2..");
            BufferedReader mPipeReader= new BufferedReader(mReader);
            System.out.println("NativeCommunicator Started pipe reader waiting ...");
            while (mPipeReader.ready()) {
                System.out.println("NativeCommunicator Data from Pipe : " + mPipeReader.readLine());
            }
            mPipeReader.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

Java code always waiting in FileReader mReader = new FileReader(FIFO_PATH);

Stack trace

E/NDK_FOO_TAG 0: /data/user/0/com.myproject.pipe/files/pipe_0
11-29 19:37:15.821 32476-32476/com.myproject.pipe D/NDK_FOO_TAG: file opened successfully
11-29 19:37:15.821 32476-32476/com.myproject.pipe D/NDK_FOO_TAG Success: Success
11-29 19:39:32.471 665-701/? E/QCALOG: [MessageQ] ProcessNewMessage: [XT-CS] unknown deliver target [OS-Agent]
11-29 19:39:32.689 665-701/? E/QCALOG: [MessageQ] ProcessNewMessage: [XTWiFi-PE] unknown deliver target [OS-Agent]
11-29 19:39:32.880 665-701/? E/QCALOG: [MessageQ] ProcessNewMessage: [XT-CS] unknown deliver target [OS-Agent]
11-29 19:39:37.471 665-701/? E/QCALOG: [MessageQ] ProcessNewMessage: [XT-CS] unknown deliver target [OS-Agent]