[CMake] CMake and a simple java example

[CHEVRIER, Marc]

Hi,

You didn’t specify nothing in variable JAVA_SOURCE_DIRECTORY, so java source path is effectively /HelloWorld.java.

By the way, you can specify relative paths to the CMakeLists.txt directory for java sources, so:

set(JAVA_SOURCE_FILES HelloWorld.java)
add_jar(${JAR_NAME} ${JAVA_SOURCE_FILES})

Should do the work.


Or alternately:

set(JAVA_SOURCE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
set(JAVA_SOURCE_FILES ${JAVA_SOURCE_DIRECTORY}/HelloWorld.java)
add_jar(${JAR_NAME} ${JAVA_SOURCE_FILES})

is also OK.






On 07/12/15 22:52, "CMake on behalf of Kristian" <cmake-bounces at cmake.org on behalf of kristianonline28 at gmail.com> wrote:

>Dear All,
>
>I am learning CMake, and one of my personal lessons is combine Java
>and CMake. I made a small example (HelloWorld.java):
>
>==========
>
>public class HelloWorld
>{
>   public static void main(String[] args)
>   {
>      System.out.println("Hey :)");
>   }
>}
>
>==========
>
>And a CMakeLists.txt file:
>
>==========
>
>cmake_minimum_required(VERSION 2.8)
>project(HelloWorld)
>
>find_package(Java REQUIRED)
>include(UseJava)
>
>set(JAR_NAME HelloWorld)
>set(JAVA_SOURCE_DIRECTORY )
>set(JAVA_SOURCE_FILES ${JAVA_SOURCE_DIRECTORY}/HelloWorld.java)
>add_jar(${JAR_NAME} ${JAVA_SOURCE_FILES})
>
>==========
>
>Then I go into that directory where the CMakeLists.txt is and start the command
>
>==========
>cmake --target=HelloWorld --build .
>==========
>
>Output is:
>
>==========
>
>-- The C compiler identification is GNU 4.8.4
>-- The CXX compiler identification is GNU 4.8.4
>-- Check for working C compiler: /usr/bin/cc
>-- Check for working C compiler: /usr/bin/cc -- works
>-- Detecting C compiler ABI info
>-- Detecting C compiler ABI info - done
>-- Check for working CXX compiler: /usr/bin/c++
>-- Check for working CXX compiler: /usr/bin/c++ -- works
>-- Detecting CXX compiler ABI info
>-- Detecting CXX compiler ABI info - done
>-- Found Java: /usr/bin/java (found version "1.8.0.66")
>-- Jar file /home/some/Downloads/HelloWorld/HelloWorld.jar
>-- Class compiled to /home/some/Downloads/HelloWorld/CMakeFiles/HelloWorld.dir
>-- Configuring done
>-- Generating done
>-- Build files have been written to: /home/some/Downloads/HelloWorld
>
>==========
>
>But when I start the command "make", then I get the following output:
>
>==========
>
>Scanning dependencies of target HelloWorld
>make[2]: *** No rule to make target `/HelloWorld.java', needed by
>`CMakeFiles/HelloWorld.dir/java_compiled_HelloWorld'.  Stop.
>make[1]: *** [CMakeFiles/HelloWorld.dir/all] Error 2
>make: *** [all] Error 2
>
>==========
>
>Can you tell me, what I am doing wrong?
>-- 
>
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