Java 如何解决“找不到 JNI”，在 Raspberry Pi 上构建 OpenCV？
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How to resolve "Could not find JNI", building OpenCV on Raspberry Pi?
提问by Dmitry Obukhov
I try to build opencv with Java on Raspberry Pi (Debian 4.6.3) and get every time an error from cmake: Could not find JNI (missing: JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH). I used this documentation (http://docs.opencv.org/doc/tutorials/introduction/desktop_java/java_dev_intro.html#sbt-project-for-java-and-scala). I have been searching for solution in the Internet for a while. The suggestions were set JAVA_HOME variable, install ant, install python, add ${JAVA_HOME}/bin variable to the PATH variable, set JDK_HOME variable to my jdk1.8.0 home. Unfortunately, nothing has helped me yet. I tried everything, I even tried to completely remove opencv (2.4.6.1) from the Raspberry Pi, download another Version (2.4.6) and build it with cmake - nothing worked. I have two jre's on the Raspberry Pi: one (probably) preinstalled "Java-6-openjdk-armhf" and one, I installed by myself "Java Early Access" (jdk1.8.0 - speciffically for Raspbian with hardfloat). I tried to set JAVA_HOME to "/home/pi/java/jdk1.8.0" (where I installed "Java Early Access") and "/home/pi/java/jdk1.8.0/", The Problem seems to be that cmake cannot find jni.h file, which usually can be found in "JAVA_HOME/include/". I checked this file and I have it; if I type "ls $JAVA_HOME/include" in the shell, I get files with jni.h among them. So, I am out of ideas. Please, help me, if you know how to solve my Problem.
我尝试在 Raspberry Pi（Debian 4.6.3）上使用 Java 构建 opencv，并且每次从 cmake 中得到错误：找不到 JNI（缺少：JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH）。我使用了这个文档（http://docs.opencv.org/doc/tutorials/introduction/desktop_java/java_dev_intro.html#sbt-project-for-java-and-scala）。我一直在互联网上寻找解决方案一段时间。建议设置JAVA_HOME变量，安装ant，安装python，将${JAVA_HOME}/bin变量添加到PATH变量中，将JDK_HOME变量设置为我的jdk1.8.0 home。不幸的是，还没有什么能帮到我。我尝试了所有方法，甚至尝试从 Raspberry Pi 中完全删除 opencv (2.4.6.1)，下载另一个版本 (2.4.6) 并使用 cmake 构建它 - 没有任何效果。我在 Raspberry Pi 上有两个 jre：一个（可能）预装了“Java-6-openjdk-armhf”，另一个是我自己安装的“Java Early Access”（jdk1.8.0 - 特别适用于带有硬浮点的 Raspbian）。我试图将 JAVA_HOME 设置为“/home/pi/java/jdk1.8.0”（我安装了“Java Early Access”）和“/home/pi/java/jdk1.8.0/”，问题似乎是cmake找不到jni.h文件，通常可以在“JAVA_HOME/include/”中找到。我检查了这个文件，我有它；如果我在 shell 中输入“ls $JAVA_HOME/include”，我会得到其中包含 jni.h 的文件。所以，我没有想法。如果您知道如何解决我的问题，请帮助我。
Thanks in advance!
提前致谢！
Dmitry
德米特里
回答by user2740142
I've finally found the solution of my Problem, so I answer it by myself. As it turned out, cmake checks for System variables of Administrator on Raspberry Pi, I, unfortunately, set JAVA_HOME and ANT_HOME only for my user (not administrator). It seems that if I change file /etc/Profile, the changes will not concern the Administrator and I didn't know that :-(
我终于找到了我的问题的解决方案，所以我自己回答了。事实证明，cmake 检查 Raspberry Pi 上管理员的系统变量，不幸的是，我仅为我的用户（不是管理员）设置了 JAVA_HOME 和 ANT_HOME。似乎如果我更改文件 /etc/Profile，更改将与管理员无关，我不知道:-(
So, after I set JAVA_HOME and ANT_HOME plus PATH for the Administrator, cmake has found ANT and JNI.
所以，在我为管理员设置了 JAVA_HOME 和 ANT_HOME 加上 PATH 之后，cmake 已经找到了 ANT 和 JNI。
Hope, it will help somebody!
希望，它会帮助某人！
Best regards,
此致，
Dmitry
德米特里
回答by Marco Ponzi
I had this problem on amazon EC2 and solved it with:
我在亚马逊 EC2 上遇到了这个问题，并通过以下方式解决了它：
sudo yum install java-1.7.0-openjdk-devel
须藤 yum 安装 java-1.7.0-openjdk-devel
