Linux用jna 调用so动态库 报错 Error looking up fu?报错

 我在服务器上调用 别的同事 用c++写的so库，采用jna调用

Java 代码如下

import com.sun.jna.Library;
import com.sun.jna.Native;

public class TestSo {
	public interface LgetLib extends Library {
	
		LgetLib INSTANCE = (LgetLib) Native.loadLibrary("helloword", LgetLib.class);

		String print();
	}

	public String print() {
		return LgetLib.INSTANCE.print();
	}

}

#include <stdio.h>
#include <string>




std::string print()
{
        std::string res;
        res= "hello word";
        return res;




}

调用后老是报错

java.lang.UnsatisfiedLinkError: Error looking up function 'print': /usr/lib64/libhelloword.so: undefined symbol: print
	com.sun.jna.Function.<init>(Function.java:129)
	com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:250)
	com.sun.jna.Library$Handler.invoke(Library.java:191)
	com.sun.proxy.$Proxy41.print(Unknown Source)
	com.hshbic.aiTools.controller.device.TestSo.print(TestSo.java:15)
	com.hshbic.aiTools.controller.device.DeviceController.queryModuleTypes(DeviceController.java:25)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:606)