Goal:将 Java 链接到 Swift
Problem:我得到一个UnsatisfiedLinkError当尝试加载 JNI 时.dylib
与 Swift 链接的文件.dylib
调用时文件System#loadLibrary(String).
预期行为:Java的依赖.dylib
将自动加载或调用System.loadLibrary("SwiftCode")
将加载依赖项(我能想到的唯一解决方案)。
Note:我正在结合这个 github 教程 and 这篇中等文章创建我的 JNI.dylib
文件和本教程创建我的 Swift.dylib
file.
完整的堆栈跟踪:
Exception in thread "main" java.lang.UnsatisfiedLinkError: /Users/hillmacbookpro/IdeaProjects/JavaToSwift/src/native/libSwiftHelloWorld.dylib: dlopen(/Users/hillmacbookpro/IdeaProjects/JavaToSwift/src/native/libSwiftHelloWorld.dylib, 1): Library not loaded: libSwiftCode.dylib
Referenced from: /Users/hillmacbookpro/IdeaProjects/JavaToSwift/src/native/libSwiftHelloWorld.dylib
Reason: image not found
at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
at java.base/java.lang.ClassLoader$NativeLibrary.load(ClassLoader.java:2408)
at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(ClassLoader.java:2465)
at java.base/java.lang.ClassLoader.loadLibrary0(ClassLoader.java:2662)
at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2627)
at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:829)
at java.base/java.lang.System.loadLibrary(System.java:1833)
at helloworld.SwiftHelloWorld.<clinit>(SwiftHelloWorld.java:7)
文件结构:
src
- helloworld
- SwiftHelloWorld.java
- native
- libSwiftHelloWorld.dylib
- libSwiftCode.dylib
MCVE:
SwiftHelloWorld.java
:
package helloworld;
public class SwiftHelloWorld {
static {
System.loadLibrary("SwiftCode"); // loading SwiftHelloWorld's dependency first
System.loadLibrary("SwiftHelloWorld"); // exception thrown here, can't find dependency?
}
public static native void printHelloWorldImpl();
public static void main(final String[] args) {
printHelloWorldImpl();
}
}
libSwiftHelloWorld.dylib
:使用这两个终端命令创建:
export JAVA_HOME="$(/usr/libexec/java_home -v 11)"; gcc -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/darwin/" -o libSwiftHelloWorld.dylib -dynamiclib helloworld_SwiftHelloWorld.c libSwiftCode.dylib
和这些文件:
-
helloworld_SwiftHelloWorld.c
:
#include <jni.h>
#include <stdio.h>
#include "helloworld_SwiftHelloWorld.h"
#include "helloworld_SwiftHelloWorld_swift.h"
JNIEXPORT void JNICALL Java_helloworld_SwiftHelloWorld_printHelloWorldImpl
(JNIEnv *env, jclass clazz) {
int result = swiftHelloWorld(42);
printf("%s%i%s", "Hello World from JNI! ", result, "\n");
}
helloworld_SwiftHelloWorld.h
:自动生成的 JNI 标头javac -h native/ helloworld/SwiftHelloWorld.java
-
helloworld_SwiftHelloWorld_swift.h
:
int swiftHelloWorld(int);
libSwiftCode.dylib
:创建使用swiftc SwiftCode.swift -emit-library -o libSwiftCode.dylib
和SwiftCode.swift
file:
import Foundation
// force the function to have a name callable by the c code
@_silgen_name("swiftHelloWorld")
public func swiftHelloWorld(number: Int) -> Int {
print("Hello world from Swift: \(number)")
return 69
}
相关问题:
其他注意事项:我将 Java 虚拟机的选项设置为-Djava.library.path=src/native
,两者的父目录.dylib
文件。我正在使用 macOS。
Edit:我已经尝试在命令之前进行编译SwiftCode.swift
with xcrun
如所见本文(在“编译 Swift 代码”下)但我仍然遇到相同的错误。