applications.gradle

//
// This Gradle build file illustrates how to process applications.
// Usage:
//     gradle -b applications.gradle proguard
//

// Tell Gradle where to find the ProGuard task.

buildscript {
    repositories {
        mavenLocal()
        mavenCentral()
        google()
    }
    dependencies {
        classpath 'com.guardsquare:proguard-gradle:7.0.1'
    }
}

// Define a ProGuard task.

task ('proguard', type: proguard.gradle.ProGuardTask) {

    // You should probably import a more compact ProGuard-style configuration
    // file for all static settings, but we're specifying them all here, for
    // the sake of the example.
    //configuration 'configuration.pro'

    verbose

    // Specify the input jars, output jars, and library jars.

    injars  'in.jar'
    outjars 'out.jar'

    // Automatically handle the Java version of this build.
    if (System.getProperty('java.version').startsWith('1.')) {
        // Before Java 9, the runtime classes were packaged in a single jar file.
        libraryjars "${System.getProperty('java.home')}/lib/rt.jar"
    } else {
        // As of Java 9, the runtime classes are packaged in modular jmod files.
        libraryjars "${System.getProperty('java.home')}/jmods/java.base.jmod", jarfilter: '!**.jar', filter: '!module-info.class'
        //libraryjars "${System.getProperty('java.home')}/jmods/....."
    }

    //libraryjars 'junit.jar'
    //libraryjars 'servlet.jar'
    //libraryjars 'jai_core.jar'
    //...

    // Save the obfuscation mapping to a file, so you can de-obfuscate any stack
    // traces later on. Keep a fixed source file attribute and all line number
    // tables to get line numbers in the stack traces.
    // You can comment this out if you're not interested in stack traces.

    printmapping 'out.map'
    renamesourcefileattribute 'SourceFile'
    keepattributes 'SourceFile,LineNumberTable'

    // Preserve all annotations.

    keepattributes '*Annotation*'

    // You can print out the seeds that are matching the keep options below.

    //printseeds 'out.seeds'

    // Preserve all public applications.

    keepclasseswithmembers 'public class * { \
        public static void main(java.lang.String[]); \
    }'

    // Preserve all native method names and the names of their classes.

    keepclasseswithmembernames includedescriptorclasses: true, 'class * { \
        native <methods>; \
    }'

    // Preserve the special static methods that are required in all enumeration
    // classes.

    keepclassmembers allowoptimization: true, 'enum * { \
        public static **[] values(); \
        public static ** valueOf(java.lang.String); \
    }'

    // Explicitly preserve all serialization members. The Serializable interface
    // is only a marker interface, so it wouldn't save them.
    // You can comment this out if your application doesn't use serialization.
    // If your code contains serializable classes that have to be backward 
    // compatible, please refer to the manual.

    keepclassmembers 'class * implements java.io.Serializable { \
        static final long serialVersionUID; \
        static final java.io.ObjectStreamField[] serialPersistentFields; \
        private void writeObject(java.io.ObjectOutputStream); \
        private void readObject(java.io.ObjectInputStream); \
        java.lang.Object writeReplace(); \
        java.lang.Object readResolve(); \
    }'

    // Your application may contain more items that need to be preserved; 
    // typically classes that are dynamically created using Class.forName:

    // keep 'public class com.example.MyClass'
    // keep 'public interface com.example.MyInterface'
    // keep 'public class * implements com.example.MyInterface'
}