java对`main'collect2的未定义引用：ld返回1退出状态

Question

I have a problem compiling a java file. My command for compile: javac -g HelloWorld.java

I wrote a simple hello world program:

public class HelloWorld {

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

}

I'm using putty , and I'm connecting with ssh . I am getting this error:

/usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../lib64/crt1.o: In function `_start':
/home/abuild/rpmbuild/BUILD/glibc-2.14.1/csu/../sysdeps/x86_64/elf/start.S:109: undefined reference to `main'
collect2: ld returned 1 exit status

Answer 1

As I see, you are using the gcc javac compiler, which doesn't work as the SUN/Oracle implementation.

I guess you need to add --main=HelloWorld to the command. Since several classes may have a 'main' method, the linker needs to be told which one to use.

Also, you might want to add -o , otherwise, you'll get a 'a.out' file, which is the default executable name for the GNU compilers (and any C compiler actually).

Hope this helps!