[移动开发]Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH

在编译OpenCV的时候，配置了JAVA_HOME环境变量，但JNI还是不生效，原因未知，但有规避的方法：直接在CMake文件里面把JNI相关的CMake变量全部配置上。变量参考：FindJNI — CMake 3.1.3 Documentation

例如：在OpenCV根目录下的CMake文件中，找到Java环境变量的位置

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# --- Java Support ---

if(BUILD_JAVA)

? if(ANDROID)

? ? include(cmake/android/OpenCVDetectAndroidSDK.cmake)

? else()

? ? include(cmake/OpenCVDetectApacheAnt.cmake)

? ? find_package(JNI)

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然后添加find_package(JNI)中本应该设置的变量

set(JAVA_INCLUDE_PATH /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/include)

? ? set(JAVA_INCLUDE_PATH2 /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/include/darwin)

? ? set(JAVA_AWT_INCLUDE_PATH /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/include)

? ? set(JAVA_AWT_LIBRARY /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/lib)

? ? set(JAVA_JVM_LIBRARY /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/lib)

? ? set(JNI_FOUND TRUE)

? ? set(JNI_LIBRARIES

? ? ? ${JAVA_AWT_LIBRARY}

? ? ? ${JAVA_JVM_LIBRARY}

? ? )

? ? set(JNI_INCLUDE_DIRS

? ? ? ${JAVA_INCLUDE_PATH}

? ? ? ${JAVA_INCLUDE_PATH2}

? ? ? ${JAVA_AWT_INCLUDE_PATH}

? ? )

再次config，虽然还会有标题的中错，但JNI实际已经配置好。如下

Python (for build): /usr/bin/python2.7

Java:

ant: /usr/local/bin/ant (ver 1.10.8)

JNI: /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/include /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/include/darwin /Users/qiumin/Desktop/bas/jdk-14.0.2.jdk/Contents/Home/include

Java wrappers: YES

Java tests: YES

Install to: /usr/local