7.2.0-beta2

Bug fixes

• Fix bug introduced in 7.2.0-beta1: potential java.lang.UnsupportedOperationException: No class provided, and an appropriate one cannot be found exception when running on Java 11
• Fix potential NullPointerException when initializing Kotlin callable references. (T5899)
• Prevent requiring --enable-preview on a JVM for Java 16 class files (write class file version 60.0 instead of 60.65535).

Java Support

New Java versions are released every 6 months.
To allow ProGuard to continue to optimize, obfuscate and shrink Java class files ProGuard now supports all Java versions including Java 17.

• Add support for Java 17. (PGD-132)

Kotlin Support

New Kotlin versions are released every 6 months.
To allow ProGuard to continue to optimize, obfuscate and shrink Kotlin generated class files and their corresponding metadata ProGuard now supports reading Kotlin classes from version 1.0 to 1.5 and writing Kotlin metadata with version 1.4 (readable by Kotlin reflection library / compiler 1.3 - 1.5).

• Add support for processing Kotlin 1.5 metadata. (T5036)

7.2.0-beta1

Java Support

New Java versions are released every 6 months.
To allow ProGuard to continue to optimize, obfuscate and shrink Java class files ProGuard now supports all Java versions including Java 17.

• Add support for Java 17. (PGD-132)

Kotlin Support

New Kotlin versions are released every 6 months.
To allow ProGuard to continue to optimize, obfuscate and shrink Kotlin generated class files and their corresponding metadata ProGuard now supports reading Kotlin classes from version 1.0 to 1.5 and writing Kotlin metadata with version 1.4 (readable by Kotlin reflection library / compiler 1.3 - 1.5).

• Add support for processing Kotlin 1.5 metadata. (T5036)

7.1.1

Version 7.1.1

Miscellaneous

Bug fixes

• Fix initialization and obfuscation of Kotlin callable references when using Kotlin 1.4. (T5631)
• Fail build when IncompleteClassHierarchyException is encountered. (T5007)
• Fix potential hanging of ProGuard process during optimization or obfuscation.

7.1.0

Version 7.1 (June 2021)

AGP 7 compatible Gradle plugin

The way ProGuard is integrated into Android projects is changing because AGP 7 will no longer allow developers to disable R8 with the android.enableR8 Gradle property.

ProGuard 7.1 includes a new Gradle plugin which allows for a seamless integration with this new AGP version. A detailed and step-by-step guide for transition from the previous plugin is provided in the upgrading guide.

• Simple integration with Android Gradle Projects by adding a dependency on the
  ProGuard Gradle Plugin artifact and applying the com.guardsquare.proguard plugin, as presented in the gradle setup instructions.

Java support

New Java versions are released every 6 months.
To allow ProGuard to continue to optimize, obfuscate and shrink Java class files we have added support for the latest releases, up to Java 16.
This includes

• Add support for processing Java 14, 15 and 16 class files. (PGC-0015, PGD-0064)
• Add support for Java 14 sealed classes. (PGD-0064)
• Add support for records (previewed in Java 15/16, targeted for Java 17). (PGD-0064)

New optimizations

ProGuard 7.1 adds 5 new code optimizations. These optimization aim at reducing the number of classes required by the application and help pinpointing the specialized type wherever possible. This can have a positive impact on code shrinking and application performances.

• method/specialization/returntype - specializes the types of method return values, whenever possible.
• method/specialization/parametertype - specializes the types of method parameters, whenever possible.
• method/generalization/class - generalizes the classes of method invocations, whenever possible.
• field/specialization/type - specializes the types of fields, whenever possible.
• field/generalization/class - generalizes the classes of field accesses, whenever possible.

Maven central

ProGuard was previously hosted at JCenter, but this repository has recently been removed.
ProGuard is now published to Maven Central.

• Simple integration : follow the gradle setup instructions to select the mavenCentral() repository and dependencies to the proguard-gradle artifact.

Easier configuration

The -addconfigurationdebugging allows to help configuring ProGuard -keep rules. For more details and to see this in action have a look at Configuring ProGuard, an Easy Step-by-Step Tutorial.

-addconfigurationdebugging previously reported -keep rule suggestions for classes, methods or fields that did not exist in the app. Such -keep rules are not necessary.

ProGuard 7.1 improves the suggestion of -keep rules by only suggesting rules for classes, methods and fields that were actually in the original application (DGD-3264).

• More precise keep rule suggestions provided by -addconfigurationdebugging.
• Easier ProGuard -keep rules configuration.
• Reduced ProGuard configuration size.

Miscellaneous

Improvements

• Remove Gradle plugin dependency on Android build tools. (PGD-0066)
• Improve error message when missing classes result in an incomplete class hierarchy. (DGD-0013)
• Improve speed of horizontal class merging. (DGD-1471)
• Fix potential NullPointerException during GSON optimization. (T3568, T3607)
• Fix potential dangling switch labels and next local index in GsonDeserializationOptimizer.
• Fix potential NoClassDefFoundError at runtime after applying Gson optimization to library project. (T2374)
• Improve general performance and stability of optimization.

Bug fixes

• Fix ProGuardTask Gradle task compatibility with Gradle 7. (PGD-0136)
• Fix potentially incorrect class merging optimizations that could cause a run-time NullPointerException. (DGD-3377)
• Fix Gradle task error when using an existing -outjar directory. (PGD-0106)
• Fix potential class merging optimization issue resulting in ArrayIndexOutOfBoundsException during build. (DGD-1995)
• Fix enum unboxing for already obfuscated code. (DGD-0567)
• Fix potential parameter removal optimization issue when optimizing constructors. (PGD-0018, PGD-0019)
• Fix potential IllegalArgumentException (Stack size becomes negative) in class/merging/wrapper optimization. (DGD-2587)
• Fix wrapper class merging with new/dup/astore sequences. (DGD-1564)
• Fix potential incorrect removal of exception handlers during optimization. (DGD-3036)
• Fix potential, incorrect advanced code optimizations. (DGD-3289)
• Disallow merging of nest hosts or members during class merging optimization. (PGD-0037)
• Fix packaging of Ant plugin. (PGD-0052)
• Fix potential IllegalArgumentException in GSON optimization. (PGD-0047)
• Fix writing of kept directories. (PGD-0110)
• Fix storage and alignment of uncompressed zip entries. (DGD-2390)
• Fix processing of constant boolean arrays. (DGD-2338)
• Prevent injected classes from being merged into other classes.

7.1.0-beta5

Issue	Explanation
DGD-3377	Fix potentially incorrect class merging optimizations that could cause a run-time NullPointerException.
	Add new AGP 7.0 compatible Gradle plugin.

7.1.0-beta4

Issue	Explanation
DGD-3264	Reduced false positives when using -addconfigurationdebugging.

7.1.0-beta3

Issue	Explanation
PGD-0054	Published ProGuard to Maven Central.
DGD-0013	Improved error message when missing classes result in an incomplete class hierarchy.
PGD-0151	Rolled back major ProGuardTask refactor (#139).
PGD-0149	Fixed invalid names being produced when ProGuard was being run concurrently within the same classloader .
PGD-0141	Fixed optimization bug introduced in 7.1.0-beta2 due to missing marking of classes that contain constructors during optimization.
	Add missing optimization info for new optimizations introduced in 7.1.0-beta2 to GUI resources.

7.1.0-beta2

Issue	Explanation
PGD-0139	Improved handling of Gradle task inputs and outputs.
PGD-0106	Fixed Gradle task error when using an existing -outjar directory.
PGD-0136	Fixed Gradle task compatibility with Gradle 7.
DGD-1995	Fixed potential class merging optimization issue resulting in ArrayIndexOutOfBoundsException during build.
DGD-0567	Fixed enum unboxing for already obfuscated code.
PGD-0018, PGD-0019	Fixed potential parameter removal optimization issue when optimizing constructors.
	Added optimization method/specialization/returntype.
	Added optimization method/specialization/parametertype.
	Added optimization method/generalization/class.
	Added optimization field/specialization/type.
	Added optimization field/generalization/class.
DGD-2587	Fixed potential IllegalArgumentException (Stack size becomes negative) in class/merging/wrapper optimization.
DGD-1564	Fixed wrapper class merging with new/dup/astore sequences.
	Prevent injected classes from being merged into other classes.
DGD-1471	Improved speed of horizontal class merging.
	Improved general performance and stability of optimization.

7.1.0-beta1

Issue	Explanation
DGD-3036	Fixed potential incorrect removal of exception handlers during optimization.
DGD-3110	Improved GSON support.
DGD-3289	Fixed potential, incorrect advanced code optimizations.
PGD-0037	Disallowed merging of nest hosts or members during class merging optimization.
PGD-0052	Fixed packaging of Ant plugin.
PGD-0047	Fixed potential IllegalArgumentException in GSON optimization.
PGD-0110	Fixed writing of kept directories.
PGC-0015	Added support for Java 16.
PGD-0064	Added support for Java 14 and 15.
PGD-0064	Added support for sealed classes (permitted subclasses attributes).
PGD-0064	Added support for record attributes.
DGD-2390	Fixed storage and alignment of uncompressed zip entries.
DGD-2338	Fixed processing of constant boolean arrays.

ProGuard 7.0.1

Issue	Explanation
DGD-2382	Fixed processing of Kotlin 1.4 metadata annotations.
DGD-2494	Fixed naming conflict resolution potentially resulting in the renaming of library members.
	Extended expressions supported by Retrace.