Java 字节数组的 JNI 内存泄漏
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JNI memory leak from byte array
提问by Tyler Davis
I have a java program that calls a native function many times over. My problem is that this function has a memory leak and everything that I do to get rid of it cause a memory dump. Any help would be greatly appreciated.
我有一个 java 程序，它多次调用本机函数。我的问题是这个函数有内存泄漏，我为摆脱它所做的一切都会导致内存转储。任何帮助将不胜感激。
This is my code
这是我的代码
JNIEXPORT void JNICALL Java_class_method_getInput
(JNIEnv *env, jobject obj)
{
if (inputIsAvailable)
{
int size = getBufferCurrentIndex();
size -= getBufferReadIndex();
size *= 2;
char *finalSendArray = new char[size];
getCommand(finalSendArray);
jbyteArray byteArray = env->NewByteArray(size / 2);
env->SetByteArrayRegion(byteArray, 0, size / 2, (jbyte*) finalSendArray);
while(methodID == 0)
{
jclass cls = env->GetObjectClass(obj);
methodID = env->GetMethodID(cls, "setCommand", "([B)V" );
}
env->CallVoidMethod(obj, methodID, byteArray);
//env->ReleaseByteArrayElements(byteArray, (jbyte*) finalSendArray, JNI_ABORT);
My problem is that the above ^ code causes a memory dump if it is uncommented, if it is not uncommented my program runs out of memory in minutes
我的问题是，上面的 ^ 代码如果没有注释会导致内存转储，如果没有取消注释，我的程序会在几分钟内耗尽内存
env->DeleteLocalRef(byteArray);
delete[] finalSendArray;
}
}
any help would be appreciated. Thanks!
任何帮助，将不胜感激。谢谢！
回答by JustinDanielson
ReleaseByteArrayElements will also free the memory if you use the JNI_ABORT param. So when you're doing the delete and release later on, one of those pointers is pointing to uninitialized memory which is causing the dump.
如果您使用 JNI_ABORT 参数，则 ReleaseByteArrayElements 也将释放内存。因此，当您稍后进行删除和释放时，这些指针之一指向导致转储的未初始化内存。
One of these will work, I fairly certain it is the first one that works.
其中一个会起作用，我相当肯定它是第一个起作用的。
env->ReleaseByteArrayElements(byteArray, (jbyte*) finalSendArray, JNI_ABORT);
delete[] finalSendArray;
Try this if the first fails.
如果第一个失败，请尝试此操作。
env->ReleaseByteArrayElements(byteArray, (jbyte*) finalSendArray, JNI_ABORT);
env->DeleteLocalRef(byteArray);
Put a print statement after the ReleaseByteArrayElements, you will see that your program is executing beyond that command and crashing on the Release/Delete[]
在 ReleaseByteArrayElements 之后放置一条打印语句，您将看到您的程序正在执行超出该命令并在 Release/Delete[] 上崩溃
