Oooorchid commented on issue #13703:
URL: https://github.com/apache/arrow/issues/13703#issuecomment-1206098206
> Or actually @Oooorchid see #13788
>
> FWIW, I believe the immediate problem in the code is the use of a string
to transport the buffer over JNI. It should be byte[].
`ByteArrayOutputStream#toString` will attempt to decode the contents _as text_
which corrupts the content.
Thanks for your reply, your solution is perfect. I also solved this
problem few days ago. as you said using string transport over JNI will cause
some questions. I used byte[] to slove this problem finally， and there is my
example：
```
......
jclass cls = env->FindClass->("com/xxxxx");
jmethodID mid = env->GetMethodID(cls, "init", "(Ljava/lang/String;)V");
jstring arg = NewJString(name.c_str());
jobject obj = env->NewObject(cls, mid, arg);
mid = env->GetMethodID(cls, "rootToByte", "[B");
jbyteArray dataArray = (jbyteArray)env->CallObjectMethod(test, mid);
int arr_len = env->GetArrayLength(dataArray);
std::cout << "arr_len is :" << arr_len << std::endl;
jbyte* bytes = env->GetByteArrayElements(dataArray, 0);
char* ret = (char*)bytes;
env->SetByteArrayRegion(dataArray, 0, arr_len, bytes);
// Actually if thers is no _arrlen_ specified， the result will stop
when (char*)ret encounters 0
std::string result = std::string(ret, arr_len);
std::cout << "result is : " << result << std::endl;
return result;
.....
```
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