how to make jni h be found

Question

In Ubuntu 12 04  I have jdk7 from sun oracle installed  When locate jni h  it prints multiple locations    usr lib jvm java-6-openjdk-amd64 include jni h  usr lib jvm jdk1 7 0 07 include jni h       In the header file generated by JDK  there is include  lt jni h gt   and currently it complains   fatal error  jni h  No such file or directory    In my Makefile  there is no specification of locations where jni h is  And I am asking if possible to configure certain system parameter to make path of jni h  say   usr lib jvm jdk1 7 0 07 include jni h  to be known when being compiled

User · Answer

None of the posted solutions worked for me.

I had to vi into my Makefile and edit the path so that the path to the include folder and the OS subsystem (in my case, -I/usr/lib/jvm/java-8-openjdk-amd64/include/linux) was correct. This allowed me to run make and make install without issues.

User · Answer

For me it was a simple matter of being sure to include the JDK installation  I d only had the JRE   My R CMD javareconf output was looking like   Java interpreter    usr lib jvm java-8-openjdk-amd64 jre bin java Java version       1 8 0 191 Java home path      usr lib jvm java-8-openjdk-amd64 jre Java compiler      not present Java headers gen   Java archive tool   trying to compile and link a JNI program detected JNI cpp flags      detected JNI linker flags   -L  JAVA HOME  lib amd64 server -ljvm gcc -std gnu99 -I usr share R include -DNDEBUG      -fpic  -g -O2 -fstack-protector-strong -Wformat -Werror format-security -Wdate-time -D FORTIFY SOURCE 2 -g  -c conftest c -o conftest o conftest c 1 17  fatal error  jni h  No such file or directory compilation terminated   usr lib R etc Makeconf 159  recipe for target  conftest o  failed make       conftest o  Error 1 Unable to compile a JNI program   JAVA HOME           usr lib jvm java-8-openjdk-amd64 jre Java library path  JNI cpp flags      JNI linker flags   Updating Java configuration in  usr lib R Done    And indeed there was no include file in my  JAVA HOME  Very simple remedy   sudo apt-get install openjdk-8-jre openjdk-8-jdk    note that this is specifically intended to install the openJDK and not the one from Oracle   Afterwards all is well   Java interpreter    usr lib jvm java-8-openjdk-amd64 jre bin java Java version       1 8 0 191 Java home path      usr lib jvm java-8-openjdk-amd64 jre Java compiler       usr lib jvm java-8-openjdk-amd64 jre    bin javac Java headers gen    usr lib jvm java-8-openjdk-amd64 jre    bin javah Java archive tool   usr lib jvm java-8-openjdk-amd64 jre    bin jar  trying to compile and link a JNI program detected JNI cpp flags      -I  JAVA HOME     include -I  JAVA HOME     include linux detected JNI linker flags   -L  JAVA HOME  lib amd64 server -ljvm gcc -std gnu99 -I usr share R include -DNDEBUG -I usr lib jvm java-8-openjdk-amd64 jre    include -I usr lib jvm java-8-openjdk-amd64 jre    include linux     -fpic  -g -O2 -fstack-protector-strong -Wformat -Werror format-security -Wdate-time -D FORTIFY SOURCE 2 -g  -c conftest c -o conftest o g   -shared -L usr lib R lib -Wl -Bsymbolic-functions -Wl -z relro -o conftest so conftest o -L usr lib jvm java-8-openjdk-amd64 jre lib amd64 server -ljvm -L usr lib R lib -lR   JAVA HOME           usr lib jvm java-8-openjdk-amd64 jre Java library path    JAVA HOME  lib amd64 server JNI cpp flags      -I  JAVA HOME     include -I  JAVA HOME     include linux JNI linker flags   -L  JAVA HOME  lib amd64 server -ljvm Updating Java configuration in  usr lib R Done

User · Answer

I don t know if this applies in this case  but sometimes the file got deleted for unknown reasons  copying it again into the respective folder should resolve the problem

User · Answer

Setting JAVA INCLUDE DIR to where jni h is located should solve your problem  setting CPPFLAGS did not work for me   Assuming it is  usr lib64 java include   export JAVA INCLUDE DIR  usr lib64 java include

User · Answer

It needs both jni h and jni md h files  Try this  gcc -I usr lib jvm jdk1 7 0 07 include     -I usr lib jvm jdk1 7 0 07 include linux filename c   This will include both the broad JNI files and the ones necessary for linux

User · Answer

Installing the OpenJDK Development Kit  JDK  should fix your problem   sudo apt-get install openjdk-X-jdk   This should make you able to compile without problems

User · Answer

Above answers give you a hardcoded path solution   This is bad on so many levels  java version change  OS change  etc    Cleaner solution is to add   JAVA HOME     shell dirname    readlink -f    which java   sed  s jre bin       near the top of your makefile  then add   -I  JAVA HOME  include   To your include flags   I am posting this because I ran into the same problem and spent too much time googling for wrong answers  I am building an app on multiple platforms so the build environment needs to be transportable

User · Answer

You have to tell your compiler where is the include directory  Something like this   gcc -I usr lib jvm jdk1 7 0 07 include   But it depends on your makefile

User · Answer

Use the following code   make -I usr lib jvm jdk  include   where jdk  is the directory name of your jdk installation  e g  jdk1 7 0    And there wouldn t be a system-wide solution since the directory name would be different with different builds of JDK downloaded and installed  If you desire an automated solution  please include all commands in a single script and run the said script in Terminal

User · Answer

I usually define my JAVA HOME variable like so   export JAVA HOME  usr lib jvm java    Therein are the necessary include files  I sometimes add the below to my  barshrc when I compile a lot of things that need it

User · Answer

In case you are on Ubuntu    X means 6 7 8    apt install openjdk-X-jdk

[java] how to make jni.h be found?

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