JAVA/JNI-加载具有循环依赖项的本机DLL [英] JAVA/JNI - Load native DLL with circular dependency

问题描述

我尝试使用JNI在我的Java项目中加载c ++代码.我要加载许多DLL，但不幸的是，其中两个之间存在循环依赖关系:dll A需要dll B，而dll B又需要dll A！我知道在DLL之间具有循环依赖关系是不好的编程设计，但是在我的项目中，C ++代码对我来说是一个黑匣子.

I try to load c++ code in my java project with JNI. I have many several DLL to load, and unfortunately there is a cyclic dependency between two of them : dll A needs dll B which in turns need dll A ! I know it is a bad programming design to have circular dependencies between DLL, but in my project the c++ code is a black box to me.

有没有办法以周期性依赖方式加载DLL ?

感谢您的帮助.

jpsi

详细信息:

我的代码很简单:

System.loadLibrary("myDLLA"); // needs dll B to be loaded!
System.loadLibrary("myDLLB"); // needs dll A to be loaded!
System.loadLibrary("myDLLC"); // needs dll B
// then call my native method implemented in dll C

java库路径是可以的，并且包含两个DLL(作为VM参数给出，我也将其转储并在运行时检查了它).循环依赖性已由Dependendcy Walker确认.

The java library path is OK and contains the two DLL (it is given as VM argument, I dumped it and checked it at run time too). The cyclic dependency was confirmed by Dependendcy Walker.

错误是:

java.lang.UnsatisfiedLinkError: E:\...\myDLLA.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1928)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1854)
at java.lang.Runtime.loadLibrary0(Runtime.java:845)
at java.lang.System.loadLibrary(System.java:1084)

我的项目是在Eclipse(Helios)中开发的，它是部署在tomcat 6服务器上的动态Web项目.

My project is developed in Eclipse (Helios) as a dynamic web project deployed on a tomcat 6 server.

请告诉我是否需要更多信息.

Please tell me if you need more information.

再次感谢您的帮助！

推荐答案

在Windows上，DLL加载程序将遵循PATH来解析外部引用.您可以将myDLLB.dll的目录全局添加到PATH(通过系统属性->高级)，也可以在启动Java应用程序(set或xset)的命令行中添加，也可以从Java代码中添加.

On Windows, the DLL loader will follow the PATH to resolve external references. You can add the directory of myDLLB.dll to PATH globally (through System properties-> advanced), or on command line which launches your Java app (set or xset), or from your Java code.

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