Disable process for package-protected visibility

[florentm35]

Hello,

I need to create a fat jar of my application, which uses Spring Boot in Java 21.

In my configuration, I use:

-keep class org.** { *; }
-keep class org.springframework.** { *; }
-keepclassmembers class org.springframework.** { *; }
-keepnames class org.springframework.beans.** { *; }

But ProGuard doesn't ignore org.springframework.beans.ExtendedBeanInfo, a package-protected class:

[proguard] error[1004]: proguard.evaluation.exception.IncompleteClassHierarchyException
 [proguard]   --> org/springframework/beans/ExtendedBeanInfo : <init>(Ljava/beans/BeanInfo;)V at invokeinterface #43, 512
 [proguard] 69 |     astore v6
 [proguard] 71 |     new #33
 [proguard] 74 |     dup
 [proguard] 75 |     aload v6
 [proguard] 77 |     invokespecial #35
 [proguard] 80 |     goto +12
 [proguard] 92 |     invokeinterface #43, 512
 [proguard]   |     ^^^^^^^^^^^^^^^^^^^^^^^^ Can't find common super class of [org.springframework.beans.ExtendedBeanInfo$SimplePropertyDescriptor] (with 1 known super classes: org.springframework.beans.ExtendedBeanInfo$SimplePr
opertyDescriptor and 1 unknown classes: java.beans.PropertyDescriptor) and [org.springframework.beans.ExtendedBeanInfo$SimpleIndexedPropertyDescriptor] (with 1 known super classes: org.springframework.beans.ExtendedBeanInfo$Simp
leIndexedPropertyDescriptor and 1 unknown classes: java.beans.IndexedPropertyDescriptor)
 [proguard] 97 |     pop
 [proguard] Variables: [P0:P0:Lorg/springframework/beans/ExtendedBeanInfo;!][P1:P1:Ljava/beans/BeanInfo;?][33:M28:[Ljava/beans/PropertyDescriptor;?][36:i][38,137:i][50:49:Ljava/beans/PropertyDescriptor;?][empty:empty]
 [proguard] Stack: [53:F53:Ljava/util/Set;][86:83:N83:Lorg/springframework/beans/ExtendedBeanInfo$SimplePropertyDescriptor;=!]
 [proguard]
 [proguard] Unexpected error while performing partial evaluation:
 [proguard]   Class       = [org/springframework/beans/ExtendedBeanInfo]
 [proguard]   Method      = [<init>(Ljava/beans/BeanInfo;)V]
 [proguard]   Exception   = [proguard.evaluation.exception.IncompleteClassHierarchyException] (Can't find common super class of [org.springframework.beans.ExtendedBeanInfo$SimplePropertyDescriptor] (with 1 known super classes: o
rg.springframework.beans.ExtendedBeanInfo$SimplePropertyDescriptor and 1 unknown classes: java.beans.PropertyDescriptor) and [org.springframework.beans.ExtendedBeanInfo$SimpleIndexedPropertyDescriptor] (with 1 known super classe
s: org.springframework.beans.ExtendedBeanInfo$SimpleIndexedPropertyDescriptor and 1 unknown classes: java.beans.IndexedPropertyDescriptor))
 [proguard] Unexpected error while preverifying:
 [proguard]   Class       = [org/springframework/beans/ExtendedBeanInfo]
 [proguard]   Method      = [<init>(Ljava/beans/BeanInfo;)V]
 [proguard]   Exception   = [proguard.evaluation.exception.IncompleteClassHierarchyException] (Can't find common super class of [org.springframework.beans.ExtendedBeanInfo$SimplePropertyDescriptor] (with 1 known super classes: o
rg.springframework.beans.ExtendedBeanInfo$SimplePropertyDescriptor and 1 unknown classes: java.beans.PropertyDescriptor) and [org.springframework.beans.ExtendedBeanInfo$SimpleIndexedPropertyDescriptor] (with 1 known super classe
s: org.springframework.beans.ExtendedBeanInfo$SimpleIndexedPropertyDescriptor and 1 unknown classes: java.beans.IndexedPropertyDescriptor))
 [proguard] Unexpected error
 [proguard] java.lang.RuntimeException:
 [proguard]
 [proguard] It appears you are missing some classes resulting in an incomplete class hierarchy,
 [proguard] please refer to the troubleshooting page in the manual:
 [proguard] https://www.guardsquare.com/en/products/proguard/manual/troubleshooting#superclass
 [proguard]
 [proguard]     at proguard.ProGuard.execute(ProGuard.java:268) ~[proguard-base-7.4.1.jar:7.4.1]
 [proguard]     at proguard.ProGuard.main(ProGuard.java:648) ~[proguard-base-7.4.1.jar:7.4.1]

Moreover, the java/beans/BeanInfo class is part of the standard Java classes, so I don't understand the error.

EDIT : I worked around the issue by first creating a jar with ProGuard, then building my fat jar from the obfuscated jar.