java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options?
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执行Maven Install打包的时候，出现以下错误信息：
[proguard] java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options? [proguard] at proguard.shrink.Shrinker.execute(Shrinker.java:171) [proguard] at proguard.ProGuard.shrink(ProGuard.java:297) [proguard] at proguard.ProGuard.execute(ProGuard.java:113) [proguard] at proguard.ProGuard.main(ProGuard.java:538)这是因为’-keep’选项使用的不正确，把所有的类都过虑掉了。
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