cmake java 演示项目无法使用我的 MANIFEST.MF 创建“jar”答案

【问题标题】：cmake java demo project cannot create "jar" with my MANIFEST.MFcmake java 演示项目无法使用我的 MANIFEST.MF 创建“jar”
【发布时间】：2019-07-12 12:14:10
【问题描述】：

我有一个非常简单的 cmake java 项目

(1) CMakeLists.txt：

cmake_minimum_required (VERSION 2.8)
find_package(Java)
include(UseJava)
enable_testing()

project (HelloWorld)
set(CMAKE_JAVA_COMPILE_FLAGS "-source" "1.8" "-target" "1.8")
set(CMAKE_JAVA_MANIFEST MANIFEST.MF)
add_jar(HelloWorld HelloWorld.java)

get_target_property(_jarFile HelloWorld JAR_FILE)
get_target_property(_classDir HelloWorld CLASSDIR)
message(STATUS "Jar file ${_jarFile}")
message(STATUS "Class compiled to ${_classDir}")

(2) HelloWorld.java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

(3) 清单.MF

Manifest-Version: 1.0
Extension-Name: My
Implementation-Version: 1.1
Main-Class: HelloWorld

(4) cmake 。 && 制作

-- Jar file /root/mynet/mytest/build/useCmake/forJava/HelloWorld.jar
-- Class compiled to /root/mynet/mytest/build/useCmake/forJava/CMakeFiles/HelloWorld.dir
-- Configuring done
-- Generating done
-- Build files have been written to: /root/mynet/mytest/build/useCmake/forJava
/usr/bin/cmake -H/root/mynet/mytest/build/useCmake/forJava -B/root/mynet/mytest/build/useCmake/forJava --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /root/mynet/mytest/build/useCmake/forJava/CMakeFiles /root/mynet/mytest/build/useCmake/forJava/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/root/mynet/mytest/build/useCmake/forJava'
make -f CMakeFiles/HelloWorld.dir/build.make CMakeFiles/HelloWorld.dir/depend
make[2]: Entering directory '/root/mynet/mytest/build/useCmake/forJava'
cd /root/mynet/mytest/build/useCmake/forJava && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /root/mynet/mytest/build/useCmake/forJava /root/mynet/mytest/build/useCmake/forJava /root/mynet/mytest/build/useCmake/forJava /root/mynet/mytest/build/useCmake/forJava /root/mynet/mytest/build/useCmake/forJava/CMakeFiles/HelloWorld.dir/DependInfo.cmake --color=
make[2]: Leaving directory '/root/mynet/mytest/build/useCmake/forJava'
make -f CMakeFiles/HelloWorld.dir/build.make CMakeFiles/HelloWorld.dir/build
make[2]: Entering directory '/root/mynet/mytest/build/useCmake/forJava'
make[2]: Nothing to be done for 'CMakeFiles/HelloWorld.dir/build'.
make[2]: Leaving directory '/root/mynet/mytest/build/useCmake/forJava'
[100%] Built target HelloWorld
make[1]: Leaving directory '/root/mynet/mytest/build/useCmake/forJava'
/usr/bin/cmake -E cmake_progress_start /root/mynet/mytest/build/useCmake/forJava/CMakeFiles 0

好的，看起来不错，但是

java -jar HelloWorld.jar
no main manifest attribute, in HelloWorld.jar

我检查了我 jar 中的 META-INF/MANIFEST.MF，它不是我自己的 MANIFEST：

jar tvf HelloWorld.jar
     0 Tue Feb 19 03:56:08 GMT 2019 META-INF/
    69 Tue Feb 19 03:56:08 GMT 2019 META-INF/MANIFEST.MF
   427 Tue Feb 19 03:49:20 GMT 2019 HelloWorld.class

它只包含 2 行：

Manifest-Version: 1.0
Created-By: 1.8.0_191 (Oracle Corporation)

看来我的清单文件没有生效。如何解决？非常感谢

【问题讨论】：

标签： java jar cmake package manifest

【解决方案1】：

根据cmake documentation：

要为 jar 定义自定义清单，您可以使用清单命名参数：
add_jar(example MANIFEST /path/to/manifest)

但请注意，我从未听说过有人使用 cmake 构建 Java 代码。

看看 maven、ivy 或 gradle - 它们得到了积极的支持和开发。

【讨论】：

同一个目标“HelloWorld”不能有2个“add_jar”，cmake会报错
@HindForsum: 不需要额外的add_jar，只需将MANIFEST 选项添加到existed add_jar 调用，这将创建HelloWorld 目标，如@987654322 @。（我同意文档对此并不清楚）。