CODEWITHSUNDEEP
javalinuxjava-8cmake
user997112
user997112

Reputation: 30615

CMake cannot find Java on Linux "Could NOT find Java (missing: Java_JAVAH_EXECUTABLE)"

I'm encountering a CMake error suggesting it cannot find Java (JDK I think?):

Could NOT find Java (missing: Java_JAVAH_EXECUTABLE) (found version
  "1.8.0_181")

However, when I run:

which javac

I get:

/bin/javac

but setting:

export JAVA_HOME=/bin/javac

and re-compiling does not solve the problem.

Anybody encountered this before?

Upvotes: 1

Views: 7634

Answers (4)

goe
goe

Reputation: 2303

In my case I have been able to solve it including the correct JAVA_HOME path (I used the java version installed by Android Studio), and its bin directory in the PATH variable:

JAVA_HOME=/home/user/Applications/android-studio/jbr 
export PATH=$PATH:$JAVA_HOME/bin

Upvotes: 0

Paolo Cavatore Ercole
Paolo Cavatore Ercole

Reputation: 1

I can confirm the approach by caifeng-zhu worked for me, even though the CMake error I got, arised in the attempt to compile ceph-libs (17.2.5-6), was slightly different:

  Could NOT find Java (missing: Java_JAVAC_EXECUTABLE Java_JAR_EXECUTABLE Java_JAVADOC_EXECUTABLE Development) (found version "11.0.18")

I solved it by modifying /usr/share/cmake/Modules/FindJava.cmake only in its _JAVA_PATHS section, by adding the Java's explicit folder location found in my packet manager (but I also could have used whereis java). In my case a more recent Java version was installed (19.0.2.u7-2), so I added a line to FindJava.cmake pointing to this latter one.

My configuration is:

  • Kernel: 5.15.105-1-MANJARO x86_64
  • cmake: 3.26.2
  • openjdk version "11.0.18" 2023-01-17 (default)
  • openjdk version "19.0.2" 2023-01-17

Upvotes: 0

caifeng.zhu
caifeng.zhu

Reputation: 21

I have encountered the same problem, but with a different cause. I post my problem and solution below, hoping to save others' troubleshooting time.

problem:

The CMake reported an error much like the thread title:

CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
  Could NOT find Java (missing: Java_JAVAH_EXECUTABLE) (found version
  "11.0.7")
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake/Modules/FindJava.cmake:191 (find_package_handle_standard_args)
  CMakeLists.txt:20 (find_package)

analysis:

Look at the file /usr/share/cmake/Modules/FindJava.cmake. It is found that _JAVA_HINTS and _JAVA_PATHS do not include my java version.

solution:

Use a new version CMake that supports my java version

Upvotes: 2

Joni
Joni

Reputation: 111329

It looks like cmake is looking for javah not javac. You're using Java 1.8, so you should have javah installed. (It has been removed in a later version, and instead of javah you're supposed to use javac -h)

Make sure cmake can find the javah tool by setting JAVA_HOME so that it points at the Java 8 installation directory (typically under /usr/lib/jvm on a Linux system)

Upvotes: 2

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