cmake find_package(JNI) not work in Ubuntu 12.04 amd64
cmake
Solution
You can manually modify FindJNI.cmake to help it find your installed JDK. See this gist:
https://gist.github.com/emchristiansen/6845954
It's a shame this script hasn't been updated, but maybe not a surprise, given that CMake is such a disaster.
EDIT: A more straightforward solution is to set `JAVA_HOME` properly. With OpenJDK 7 installed, I set it with:
`export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64`
Problem
I am using cmake 2.8.7 on Ubuntu 12.04 amd64. The installed OpenJDK JRE components in my system are listed below : ``` $ sudo dpkg --list | grep jdk openjdk-6-jre 6b27-1.12.5-0ubuntu0.12.04.1 OpenJDK Java runtime, using Hotspot JIT openjdk-6-jre-headless 6b27-1.12.5-0ubuntu0.12.04.1 OpenJDK Java runtime, using Hotspot JIT (headless) openjdk-6-jre-lib 6b27-1.12.5-0ubuntu0.12.04.1 OpenJDK Java runtime (architecture independent libraries) ``` However, I am not using the OpenJDK JRE components. I have manually installed Oracle Java 7 JDK in "/usr/lib/jvm/jdk1.7.0_25" and have used "update-alternatives" to point "java" to my installed Oracle Java 7 JDK. I have not set any "JAVA_HOME", "JAVA_BIN", "CLASSPATH" environment variables and the manually installed Oracle Java 7 JDK seems work OK in Eclipse 4.3. The problem is that when I use "find_package(JNI)" in cmake and use the "message()" function to show the JNI variables, I have the following result : ``` Could NOT find JNI (missing: JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) JNI_FOUND = FALSE JNI_LIBRARIES = /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libjawt.so;/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so JAVA_INCLUDE_PATH = JAVA_INCLUDE_PATH-NOTFOUND JAVA_INCLUDE_PATH2 = JAVA_INCLUDE_PATH2-NOTFOUND JAVA_AWT_INCLUDE_PATH = JAVA_AWT_INCLUDE_PATH-NOTFOUND JAVA_JVM_LIBRARY = /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server/libjvm.so JAVA_AWT_LIBRARY = /usr/lib/jvm/java-6-openjdk/jre/lib/amd64/libjawt.so JNI_INCLUDE_DIRS = JAVA_INCLUDE_PATH-NOTFOUND;JAVA_INCLUDE_PATH2-NOTFOUND;JAVA_AWT_INCLUDE_PATH-NOTFOUND ``` The "find_package(JNI)" seems could find some of the Java components related to the OpenJDK JRE and could not find my current Oracle Java 7 JDK components pointed by "update-alternatives". I want to know that is there any bug in the "FindJNI.cmake" file and what I have missed in the Oracle Java 7 JDK setup so that cmake "find_package(JNI)" could work properly. Thanks for any suggestion.