[英]Why is my Java9 module service not working?
---------------------------------------------
package org.zpf.service;
public interface Services {
void test();
}
module org.zpf.service.Services {
exports org.zpf.service;
}
---------------------------------------------
package org.zpf.impl;
import org.zpf.service.Services;
public class Impl implements Services {
@Override
public void test() {
System.out.println("Impl-1");
}
}
module org.zpf.impl.Impl {
requires org.zpf.service.Services;
provides org.zpf.service.Services with org.zpf.impl.Impl;
}
----------------------------------------------
public class Demo {
public static void main(String[] args) {
ServiceLoader.load(Services.class).forEach(Services::test);
}
}
module org.zpf.demo.Demo {
requires org.zpf.service.Services;
uses org.zpf.service.Services;
}
我正在使用 IntelliJ IDEA 运行这段代码,但看起来子模块没有运行。以下是程序的输出:
/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA 2018.3.app/Contents/lib/idea_rt.jar=61434:/Applications/IntelliJ IDEA 2018.3.app/Contents/bin" -Dfile.encoding=UTF-8 -p /Users/tubetrue01/IDEA/Test/Demo/target/classes:/Users/tubetrue01/IDEA/Test/Services/target/classes -m org.zpf.demo.Demo/org.zpf.demo.Demo
Process finished with exit code 0
您需要做的就是确保模块
module org.zpf.impl // fixing the name from that of question
出现在 modulepath 上。 从命令行执行您共享的命令并添加到impl
模块的路径按预期工作。
.../jdk-11.jdk/Contents/Home/bin/java -p .../Desktop/modular/out/production/demo:.../Desktop/modular/out/production/modular:.../Desktop/modular/out/production/impl -m org.zpf.demo.Demo/org.zpf.demo.Demo
打印扩展输出
Impl-1
在你的命令行中(格式化只是为了便于阅读)
-p /Users/tubetrue01/IDEA/Test/Demo/target/classes:
/Users/tubetrue01/IDEA/Test/Services/target/classes
应该修改成类似的东西
-p /Users/tubetrue01/IDEA/Test/Demo/target/classes:
/Users/tubetrue01/IDEA/Test/Services/target/classes:
/Users/tubetrue01/IDEA/Test/Impl/target/classes
使用IntelliJ IDEA ,您可以通过以下步骤执行相同的操作:
Demo
模块 > 导航到依赖项Impl
模块并应用。Demo
类。
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