在多线程Java应用程序中调用已编译的m文件（.jar）时出错 [英] Error when calling compiled m-file(.jar) in a multi threaded Java app

问题描述

我有一个简单的m文件

function [fRate,Height,Width] = media(filename)  
obj = mmreader(filename);  
fRate = obj.FrameRate;  
Width = obj.Width;  
Height = obj.Height;  
end

我使用MATLAB Builder JA成功编译成.jar文件。

Which I have successfully compiled using MATLAB Builder JA into a .jar file.

我在单线程应用程序中测试了.jar文件，它没有问题。

I have tested the .jar file in a single threaded application and it work with no problem.

错误我在多线程GUI应用程序中使用它时出现了。我在我创建的类之一中运行.jar作为线程，并发生以下错误。

The error came when I use it in a multi threaded GUI application. I run the .jar as a thread in one of the class I created and the following error occur.

检测到意外错误
by Java Runtime Environment：

An unexpected error has been detected by Java Runtime Environment:

EXCEPTION_ACCESS_VIOLATION
（0xc0000005）at pc = 0x6d9c08b0，
pid = 5920，tid = 4788

EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d9c08b0, pid=5920, tid=4788

Java VM：Java HotSpot（TM）客户端VM
（10.0-b19混合模式windows-x86）
有问题的框架：

Java VM: Java HotSpot(TM) Client VM (10.0-b19 mixed mode windows-x86) Problematic frame:

C [jvm.dll + 0x1108b0]

C [jvm.dll+0x1108b0]

调试后，我发现当我的错误发生时线程正在调用

media = new Media（）; （我将我的.jar命名为Media.jar）

After debugging, I found that the error occur when my thread is calling
media = new Media(); (I name my .jar as Media.jar)

这是我的Java代码：


// mediaProperty.java

This is my Java code:
// mediaProperty.java

public class mediaProperty实现Runnable {

public class mediaProperty implements Runnable {

public void mediaProperty() {

    Matlab_options matlab = new Matlab_options();
    Object[] mediaProp = null;
    java.util.List lstMedia = new ArrayList();
    Media media = null;

    try {

        media = new Media();
        ...

        mediaProp = media.media(3, lstMedia);

        ...
    } catch (Exception p) {
        System.out.println("Exception: " + p.toString());
    } finally {
        MWArray.disposeArray(mediaProp);
        if (media != null) {
            media.dispose();
        }
    }
}

public void run() {
    mediaProperty();
}

}



// GUI.java

// GUI.java

私人线程媒体;

if（mediap == null）{

mediap = new Thread（new mediaProperty（））;

mediap.start（）;

}


if (mediap == null) {
mediap = new Thread(new mediaProperty());
mediap.start();
}

有什么问题？这是我的代码吗？

What is wrong? Is it my code?

推荐答案

我的猜测是MATLAB要求你从一个线程中访问它。你说它在单线程应用程序中工作，也许你需要启动一个专用线程来与MATLAB交互以使其正常工作。

My guess is that MATLAB requires you to access it from exactly one thread. You say it works in a single threaded application, perhaps you need to start a dedicated thread for interacting with MATLAB to get this to work correctly.

参见：
Matlab引擎API的线程安全性

这篇关于在多线程Java应用程序中调用已编译的m文件（.jar）时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！