Ignoring unused library classes...java.io.IOException: You have to specify '-keep' options for the s

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执行Maven Install打包的时候，出现以下错误信息：
Ignoring unused library classes…java.io.IOException: You have to specify ‘-keep’ options for the shrinking step.

 [proguard] Ignoring unused library classes...java.io.IOException: You have to specify '-keep' options for the shrinking step. [proguard]   Original number of library classes: 19765 [proguard]   Final number of library classes:    19765 [proguard] Setting target versions... [proguard]  [proguard]     at proguard.SeedPrinter.write(SeedPrinter.java:60) [proguard]     at proguard.ProGuard.printSeeds(ProGuard.java:265) [proguard]     at proguard.ProGuard.execute(ProGuard.java:108) [proguard] Printing kept classes, fields, and methods...   at proguard.ProGuard.main(ProGuard.java:538) [proguard]

忽略未使用的库类……java.io.IOException：您必须指定 ‘-保持 ’ 选项缩小范围。

似乎ProGuard的设计原则中， ‘-keep’ 选项是必须使用的，如果你希望对所有的类都进行混淆的话，那就设置一个根本不存在的过虑器吧，例如：

-keep public class com.abcd.* {    public protected *;}

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