小编Man*_*aev的帖子

我在 IDEA Build>Build Artifacts 中创建了 jar 文件。但是不能用java -jar jarname.jar-运行它Error: Could not find or load main class Hello。MANIFEST.MF 文件位于 /resources/META-INF/ 文件夹中。这是启动器类：

public class Hello {

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

}

清单.MF：

Manifest-Version: 1.0
Main-Class: Hello

编辑：添加工件设置屏幕截图

我想在我的项目中使用 ProGuard。我激活了选项 minifyEnabled。当我打开使用库 Retrofit2 的活动时，应用程序崩溃并显示以下错误：

无法为接口改造2.Call创建调用适配器

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gatafan.mydeen/com.gatafan.mydeen.ActivityPlaces}:
        java.lang.IllegalArgumentException: Unable to create call adapter for interface retrofit2.Call
for method i.a
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Unable to create call adapter for interface retrofit2.Call
for method i.a
at retrofit2.ServiceMethod$Builder.a(Unknown Source)
at retrofit2.ServiceMethod$Builder.b(Unknown Source)
at retrofit2.ServiceMethod$Builder.a(Unknown Source)
at retrofit2.Retrofit.a(Unknown Source)
at retrofit2.Retrofit$1.invoke(Unknown Source)
at …