No ocijdbc18 in java library path machine

Copy the shared library to one of the paths already listed in java.library.path Modify the LDLIBRARYPATH environment variable to include the directory where the shared library is located. Specify the java.library.path on the command line by using the -D option. Java.library.path is the path that Java uses to find native libraries (such as lwjgl.dll). You should set it to the directory that contains the DLL files. You specify this with the -D switch on the command line, for example: java -Djava.library.path=C: Java ljwgl libs org.mypackage.MyProgram.edit. Oh, this is an old topic from 2005.

其中涉及的测试源码如下：

No ocijdbc18 in java library path machine learning

For those who didn't install Java with default settings, a systematic way for solving JNI class path problem is:
1> include 'System.out.println(System.getProperty('Java.library.path')); ' in your 'static' block, right before loading the class.
2> run your program and not surprisingly you got the err again, but this time with java.library.path info for your system. (it's important since this path name varies among systems).
3> cp your libxxx.so into the java.library.path

Java一般使用两个path：classpath 和 java.library.path

classpath是指向jar包的位置

java.library.path是非java类包的位置如（dll,so）

解决办法：

第一种方法，在代码里设置环境变量

第二种方法：执行时在vm arguments里添加-Djava.library.path= /usr/local/lib，例如java -Djava.library.path=. xxx（xxx是某个类文件的名字，不包括后缀）

No Ocijdbc18 In Java Library Path Machine

第三种方法：设置环境变量java.library.path

1：Linux下的系统变量LD_LIBRARY_PATH来添加java.library.path

No Ocijdbc18 In Java Library Path Machine Learning

2：Windows下设置哪个环境变量???????????????????

No Ocijdbc18 In Java.library.path Mac

如果你上面看不懂的话就继续向下面看：
1、在你载入jni类之前放入“System.out.println( System.getProperty('java.library.path'));
2、运行你的程序你将获得java.library.path指向的目录
3、拷贝你的libxxx.so到java.library.path指向的某个目录下面。
注意：
Linux下：一定要将Linux下的共享库（我暂且这么叫:）命名成libxxx.so的形式，'xxx'是你在System.loadLibrary('xxx')中用到的加载库名称。

Windows下：一定要将Windows下的共享库（我暂且这么叫:）命名成xxx.dll的形式（没有前边的lib三个字母），'xxx'是你在System.loadLibrary('xxx')中用到的加载库名称。

查了其他的资料：
也可以通过设置LINUX下的系统变量LD_LIBRARY_PATH来添加java.library.path，只要在启动~/.bashrc中添加如下代码然后重新登录shell，就可以将动态库放在当前目录下运行你的jni程序了。
export LD_LIBRARY_PATH=.:.:$LD_LIBRARY_PATH

另外也可以通过如下I'm new to JNI. I see there are several ways to set JVM to look for libraries dll, so, etc.

System.setProperty('java.library.path', '.');
System.loadLibrary('hello');
That's when UnsatisfiedLinkError

java.lang.UnsatisfiedLinkError: no hello in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)
at java.lang.Runtime.loadLibrary0(Runtime.java:822)
at java.lang.System.loadLibrary(System.java:992)
at HelloWorld.main(HelloWorld.java:17)

posted @ 2016-11-28 19:11LiuYanYGZ 阅读(20781) 评论(0) 编辑收藏

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