How do I use ProGuard?

Question

I was trying to learn how to use ProGuard, and it is no way as easy as I thought. At first I found a simple Java code to try it, a simple two class Swing calculator. The code can be found by following that link, but I found it too verbose to post the it here. Anyway, it is a plain application with entry point on `Calc.main()`, there are no packages. Then I compiled both sources with: ``` $ javac *.java ``` and created the `.jar` file (because it seems ProGuard only work with jars): ``` $ jar cvef Calc calc.jar *.class added manifest adding: Calc.class(in = 3869) (out= 2126)(deflated 45%) adding: Calc$ClearListener.class(in = 468) (out= 327)(deflated 30%) adding: CalcLogic.class(in = 1004) (out= 515)(deflated 48%) adding: Calc$NumListener.class(in = 1005) (out= 598)(deflated 40%) adding: Calc$OpListener.class(in = 1788) (out= 1005)(deflated 43%) ``` Wrote the ProGuard file named `obfuscate.pro`: ``` -injars calc.jar -outjars calc_obf.jar -libraryjars <java.home>/lib/rt.jar -keep public…

Accepted Answer

I got it to work using the following configuration file:

```
-injars       calc.jar
-outjars      calc_obf.jar
-libraryjars  <java.home>/lib/rt.jar
-keep class Calc {
  public static void main(java.lang.String[]);
}
```

Most notably, I ditched the `public` in front of `class Calc`.

How do I use ProGuard?

Solution

Problem

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