java - 遵循Netbeans JNI基础教程时出错

Question

我正在关注这个Netbeans tutorial for JNI但是当我构建 JNIDemo.c 库时，我在 Netbeans 输出中收到此错误:

    "/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .clean-conf
    make[1]: Entering directory `/home/username/Documents/JavaProjects/JNIDemoCd1'
    rm -f -r build/Debug
    rm -f dist/libJNIDemoCdl.so
    make[1]: Leaving directory `/home/username/Documents/JavaProjects/JNIDemoCd1'

    CLEAN SUCCESSFUL (total time: 54ms)
    "/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
    make[1]: Entering directory `/home/username/Documents/JavaProjects/JNIDemoCd1'
    "/usr/bin/make"  -f nbproject/Makefile-Debug.mk dist/libJNIDemoCdl.so
    make[2]: Entering directory `/home/username/Documents/JavaProjects/JNIDemoCd1'
    mkdir -p build/Debug/GNU-Linux-x86
    rm -f "build/Debug/GNU-Linux-x86/JNIDemo.o.d"
    gcc -shared -m32   -c -g -I/opt/jdk1.7.0_67/include -I/opt/jdk1.7.0_67/include/linux -include /opt/jdk1.7.0_67/include -include /opt/jdk1.7.0_67/include/linux -fPIC  -MMD -MP -MF "build/Debug/GNU-Linux-x86/JNIDemo.o.d" -o build/Debug/GNU-Linux-x86/JNIDemo.o JNIDemo.c
    In file included from <command-line>:0:0:
    /usr/include/stdc-predef.h:59:1: fatal error: /opt/jdk1.7.0_67/include: No such file or directory
     #endif
     ^
    compilation terminated.
    make[2]: *** [build/Debug/GNU-Linux-x86/JNIDemo.o] Error 1
    make[2]: Leaving directory `/home/username/Documents/JavaProjects/JNIDemoCd1'
    make[1]: *** [.build-conf] Error 2
    make[1]: Leaving directory `/home/username/Documents/JavaProjects/JNIDemoCd1'
    make: *** [.build-impl] Error 2

    BUILD FAILED (exit value 2, total time: 119ms)

谢谢大家!

Answer 1

解决了!!
这是架构的问题。

我使用选项 -m32 编译了该库正如教程所说，在 C 项目属性中，但我的虚拟机是 64 位机器，所以我必须使用 -m64 .

这意味着什么？当有人使用 JNI 时，有必要将我们的 VM 的架构与库的架构相匹配。

如何查看我们库的架构？在 Linux 终端中，输入:
objdump -f my_lib.so | grep ^architecture .

这样你就可以得到类似的东西(x32):architecture: i386, flags 0x00000150:
或者像这样(x64):architecture: i386:x86-64, flags 0x00000150:

所以，我输入 -m64而不是-m32在属性和“et voilà!”中，VM 64 位和库 64 位一起工作。感谢大家。