线程“main”中的异常 java.lang.UnsatisfiedLinkError：java.library.path 中没有 opencv_java249
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Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java249 in java.library.path
提问by Zetland
I'm currently trying to set up OpenCV on my 32-bit laptop, but I keep getting an error message which is confusing me:
我目前正在尝试在我的 32 位笔记本电脑上设置 OpenCV，但我不断收到一条错误消息，这让我感到困惑：
Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java249 in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at hello.main(hello.java:8)
I've tried switching a few things around, like going into User Libraries and changing the Native Library Location to \x64 instead of \x86, but that hasn't worked. I've also made sure that my Java project has OpenCV-2.4.9 as one of its libraries, which it has. I've also tried 'cleaning' all projects, but that hasn't worked (does it ever?). So I've followed all the instructions in the set-up tutorial but it still isn't working.
我试过切换一些东西，比如进入用户库并将本机库位置更改为 \x64 而不是 \x86，但这并没有奏效。我还确保我的 Java 项目将 OpenCV-2.4.9 作为它的库之一，它拥有。我也尝试过“清理”所有项目，但这并没有奏效（有没有做过？）。因此，我已按照设置教程中的所有说明进行操作，但仍然无法正常工作。
Does anyone know what the problem might be here? Thanks in advance...
有谁知道这里可能有什么问题？提前致谢...
回答by ben75
The problem is that the native opencv library cannot be found because it is not in the java.library.path(it is a native library and it should not be in usual java classpath, but it must be in the java.library.path).
问题是找不到本机opencv库，因为它不在java.library.path（它是本机库，不应在通常的java类路径中，但必须在java.library.path中）。
Your opencv distribution should contains:
您的 opencv 发行版应包含：
a java library : opencv249.jar. This library is mainly a java to native library with jni stuff allowing you to do native calls from java code. It must be in the classpath (and according the error you have and your explanations : it is on your classpath --> everything is ok here)
a native library named
libopencv_java249.soand this must be in yourjava.library.path. Obviously : it is not : the UnsatisfiedLinkError is the symptom of a missing native library. To include this native library: start your java program with the following parameter:-Djava.library.path=/path/to/the/directory/of/ibopencv_java249.so
一个java库：opencv249.jar。这个库主要是一个 Java 到本机库，带有 jni 内容，允许您从 Java 代码进行本机调用。它必须在类路径中（并且根据您的错误和您的解释：它在您的类路径中 --> 此处一切正常）
一个名为的
libopencv_java249.so本机库，它必须在您的java.library.path. 显然：它不是：UnsatisfiedLinkError 是缺少本机库的症状。要包含此本机库：使用以下参数启动您的 java 程序：-Djava.library.path=/path/to/the/directory/of/ibopencv_java249.so
回答by DK Rajput
I had the same issue on ubuntu 14.o and I struggled a lot and found this solution.
我在 ubuntu 14.o 上遇到了同样的问题，我很挣扎并找到了这个解决方案。
- use below line to print your Native lib path: System.out.println(System.getProperty("java.library.path"));
- if you are adding external openc4-version.jar then, in eclipse open BuildConfigurationPath->Library->opencv249.jar->Native Library and click edit and choose external folder which will be located inside /home/dav/Downloads/opencv-2.4.9/build/lib
- 使用下面的行打印您的本地库路径： System.out.println(System.getProperty("java.library.path"));
- 如果要添加外部 openc4-version.jar，则在 Eclipse 中打开 BuildConfigurationPath->Library->opencv249.jar->Native Library 并单击编辑并选择位于 /home/dav/Downloads/opencv-2.4 内的外部文件夹.9/构建/库
Before this I built opencv as they metioned in java-opencv quickstart tutorial by creating build folder inside opencv unziped folder then ran 2 commands 1.cmake -DBUILD_SHARED_LIBS=OFF .. if you get error then check make installed or not 2.make -j8
在此之前，我在 java-opencv 快速入门教程中通过在 opencv 解压缩文件夹中创建构建文件夹来构建 opencv，然后运行 2 个命令 1.cmake -DBUILD_SHARED_LIBS=OFF .. 如果出现错误，请检查是否安装了 make 2.make -j8
Done.
完毕。
回答by Ognjen Mi?i?
Another possible solution which worked for me on Ubuntu:
Instead of setting the JVM parameter to the exact libopen.sofile, try setting it to the folder:
在 Ubuntu 上对我有用的另一种可能的解决方案：不要将 JVM 参数设置为确切的libopen.so文件，而是尝试将其设置为文件夹：
-Djava.library.path=/opencv-3.2.0/opencv/build/lib/
