How to tell ProGuard to keep private fields without specifying each field

Question

This is my class:

package com.tools.app.holiday;  public class Holiday {        private String name;      private Calendar dateFrom = Calendar.getInstance();      private Calendar dateTo = Calendar.getInstance();      ... 

I can keep these private fields by putting the following in my ProGuard rules file:

-keepclassmembers class com.tools.app.holiday.Holiday {     private java.lang.String name;         private java.util.Calendar dateFrom;     private java.util.Calendar dateTo; } 

But I'd prefer not to have to specify each field individually. How can I do this?

P.S. I stole most of this from Proguard keep classmembers because that question was close to what I'm asking.

Answer 1

According to ProGuard documenation the wildcard <fields> matches any field. Thus it should be something like:

-keepclassmembers class com.tools.app.holiday.Holiday {     private <fields>;     } 

If you want to preserve private fields in all classes use:

-keepclassmembers class * {     private <fields>;     }