我应该如何加载本机库的JNI来避免的UnsatisfiedLinkError？ [英] How should I load native libraries for JNI to avoid an UnsatisfiedLinkError?

问题描述

我要使用JNI在Ubuntu 8.10，使用Eclipse和gcc（标一与Ubuntu，如果有味道）。

I want to use JNI on Ubuntu 8.10, using Eclipse and gcc (the standard one with Ubuntu if there are flavours).

我似乎无法载入我的图书馆，尽管make文件成功创建它。

I can't seem to load my library despite the make file creating it successfully.

主要的Java类如下：

The main Java class is as follows:

class Hello {
    public native void sayHello();

    static {
        System.loadLibrary("hello.so");
    }

    public static void main(String[] args) {
        Hello h = new Hello();
        h.sayHello();
    }
}

我的make文件是这样;

My make file is as such;

    all : hello.so

hello.so : Hello.o
    gcc -shared -o hello.so Hello.o

Hello.o : Hello.c Hello.h
    gcc -I/usr/lib/jvm/java-6-sun/include -I/usr/lib/jvm/java-6-sun/include/linux -c Hello.c -o Hello.o

Hello.h : Hello.class
    javah -jni Hello

clean :
    -del Hello.h
    -del Hello.o

在code（HELLO.C）的其余部分看起来像人会想到。

The rest of the code (Hello.c) looks like one would think.

我得到的错误是如下：

Exception in thread "main" java.lang.UnsatisfiedLinkError: no hello.so in java.library.path

如果我用一个明确的路径：

If I use an explicit path:

System.loadLibrary("/home/gavin/Work/workspace/JNI/hello.so");

然后，它的工作原理，但我宁愿不若尽可能使用显式路径。

Then it works, but I'd much rather not use an explicit path if possible.

推荐答案

由于每人应​​设置库路径到以往的Java应该寻找库。你的库名应该是libhello.so。然后加载库的调用应该是：

As per Pax you should set the library path to where ever Java should look for the library. Your library name should be libhello.so. The call to load the library should then be:

System.loadLibrary("hello");

Linux库文件按照惯例LIB引用**姓名**。所以和加载基于名称。下面是有关从痛饮文档中Java的动态链接问题的链接，虽然你是不是使用痛饮本节仍然具有现实意义。

Linux libraries are referenced by the convention lib**name**.so and loaded based on the name. Here is a link about dynamic linking problems in Java from the SWIG documentation, although you are not using SWIG this section is still relevant.

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