cmake does not find jni/java

[lobBob]

hi all, been pulling my hair out in trying to build the java wrappers for opencv 3.2. no matter what i install as the java jdk, and no matter what i set as JAVA_HOME, my Root CMake File for OpenCV does not honor the JAVA_HOME path. Ant is found but the line on JNI: remains stubbornly on NO ... so i used dakcarto's CMAKEList.txt for Find-JNI-JAVA-Test <https://gist.github.com/dakcarto/8329063> and ran it on my pi with these results (see below). if anyone can suggest a solution i would be eternally grateful, thanks, robert

-- JAVA_HOME= /usr/lib/jvm/java-8-openjdk-armhf
-- CMAKE_FIND_FRAMEWORK=
--
-- Found JNI: /usr/lib/jvm/default-java/jre/lib/arm/libjawt.so
-- _JAVA_HOME= /usr/lib/jvm/java-8-openjdk-armhf
--
-- JNI_INCLUDE_DIRS= /usr/lib/jvm/java-8-openjdk-armhf/include;/usr/lib/jvm/java-8-openjdk-armhf/include/linux;/usr/lib/jvm/java-8-openjdk-armhf/include
-- JNI_LIBRARIES= /usr/lib/jvm/default-java/jre/lib/arm/libjawt.so;/usr/lib/jvm/default-java/jre/lib/arm/server/libjvm.so
-- JAVA_AWT_LIBRARY= /usr/lib/jvm/default-java/jre/lib/arm/libjawt.so
-- JAVA_JVM_LIBRARY= /usr/lib/jvm/default-java/jre/lib/arm/server/libjvm.so
-- JAVA_INCLUDE_PATH= /usr/lib/jvm/java-8-openjdk-armhf/include
-- JAVA_INCLUDE_PATH2= /usr/lib/jvm/java-8-openjdk-armhf/include/linux
-- JAVA_AWT_INCLUDE_PATH= /usr/lib/jvm/java-8-openjdk-armhf/include
--
CMake Warning at CMakeLists.txt:41 (find_package):
By not providing "FindJAVA.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "JAVA", but
CMake did not find one.

Could not find a package configuration file provided by "JAVA" with any of
the following names:

JAVAConfig.cmake
java-config.cmake

Add the installation prefix of "JAVA" to CMAKE_PREFIX_PATH or set
"JAVA_DIR" to a directory containing one of the above files. If "JAVA"
provides a separate development package or SDK, be sure it has been
installed.


-- _JAVA_HOME= /usr/lib/jvm/java-8-openjdk-armhf
--
-- Java_JAVA_EXECUTABLE=
-- Java_JAVAC_EXECUTABLE=
-- Java_JAVAH_EXECUTABLE=
-- Java_JAVADOC_EXECUTABLE=
-- Java_JAR_EXECUTABLE=
-- Java_VERSION_STRING=
-- Java_VERSION_MAJOR=
-- Java_VERSION_MINOR=
-- Java_VERSION_PATCH=
-- Java_VERSION_TWEAK=
-- Java_VERSION=
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi

[lobBob]

Guess changing this from a question to a bug report. Generated the cmake with cmake-gui instead. There i specified the java paths totally consistent with the path set for my java_home env var and it generated without any problem... So i take it that the command line cmake is not properly executing the find jni even though java_home is defined correctly.

[DougieLawson]

If it's a bug you'll need to report it to the Cmake developers.
https://gitlab.kitware.com/cmake/cmake/issues

But before doing that read the existing bugs
https://gitlab.kitware.com/cmake/cmake/ ... earch=Java