Test case, 3 files, compilation OK, javap used to display class files.


$ more play/demo2/src/*.java
::::::::::::::
play/demo2/src/A.java
::::::::::::::
sealed abstract class A permits C { }
::::::::::::::
play/demo2/src/B.java
::::::::::::::
sealed abstract class B permits C { }
::::::::::::::
play/demo2/src/C.java
::::::::::::::
class C extends B { }
$ ./build/linux-x86_64-server-release/images/jdk/bin/javac -d play/demo2/classes play/demo2/src/*.java
$ for i in $(ls play/demo2/classes/*.class) ; do ./build/linux-x86_64-server-release/images/jdk/bin/javap -v -p $i ; done
Classfile /w/jjg/work/jdk.amber/play/demo2/classes/A.class
  Last modified Jul 30, 2019; size 213 bytes
  SHA-256 checksum 29dad7fd3236e3f8e381aafb2e5768d0a49e23306afbfc47bbbe39bfac4f09ea
  Compiled from "A.java"
final abstract class A
  minor version: 0
  major version: 58
  flags: (0x0430) ACC_FINAL, ACC_SUPER, ACC_ABSTRACT
  this_class: #7                          // A
  super_class: #2                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 1, attributes: 2
Constant pool:
   #1 = Methodref          #2.#3          // java/lang/Object."<init>":()V
   #2 = Class              #4             // java/lang/Object
   #3 = NameAndType        #5:#6          // "<init>":()V
   #4 = Utf8               java/lang/Object
   #5 = Utf8               <init>
   #6 = Utf8               ()V
   #7 = Class              #8             // A
   #8 = Utf8               A
   #9 = Utf8               Code
  #10 = Utf8               LineNumberTable
  #11 = Utf8               SourceFile
  #12 = Utf8               A.java
  #13 = Utf8               PermittedSubtypes
  #14 = Class              #15            // C
  #15 = Utf8               C
{
  A();
    descriptor: ()V
    flags: (0x0000)
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return
      LineNumberTable:
        line 1: 0
}
SourceFile: "A.java"
PermittedSubtypes:
  C
Classfile /w/jjg/work/jdk.amber/play/demo2/classes/B.class
  Last modified Jul 30, 2019; size 213 bytes
  SHA-256 checksum 2ce3a92c924a6a59f5d14e7c7bd3f80b3bfa4b092b449237bc388b3bae8057fc
  Compiled from "B.java"
final abstract class B
  minor version: 0
  major version: 58
  flags: (0x0430) ACC_FINAL, ACC_SUPER, ACC_ABSTRACT
  this_class: #7                          // B
  super_class: #2                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 1, attributes: 2
Constant pool:
   #1 = Methodref          #2.#3          // java/lang/Object."<init>":()V
   #2 = Class              #4             // java/lang/Object
   #3 = NameAndType        #5:#6          // "<init>":()V
   #4 = Utf8               java/lang/Object
   #5 = Utf8               <init>
   #6 = Utf8               ()V
   #7 = Class              #8             // B
   #8 = Utf8               B
   #9 = Utf8               Code
  #10 = Utf8               LineNumberTable
  #11 = Utf8               SourceFile
  #12 = Utf8               B.java
  #13 = Utf8               PermittedSubtypes
  #14 = Class              #15            // C
  #15 = Utf8               C
{
  B();
    descriptor: ()V
    flags: (0x0000)
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return
      LineNumberTable:
        line 1: 0
}
SourceFile: "B.java"
PermittedSubtypes:
  C
Classfile /w/jjg/work/jdk.amber/play/demo2/classes/C.class
  Last modified Jul 30, 2019; size 161 bytes
  SHA-256 checksum 513ec1291b94119ebf0c5beab95d2f2b8a446c341e3fa20e61d35637b5b8589f
  Compiled from "C.java"
final class C extends B
  minor version: 0
  major version: 58
  flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: #7                          // C
  super_class: #2                         // B
  interfaces: 0, fields: 0, methods: 1, attributes: 1
Constant pool:
   #1 = Methodref          #2.#3          // B."<init>":()V
   #2 = Class              #4             // B
   #3 = NameAndType        #5:#6          // "<init>":()V
   #4 = Utf8               B
   #5 = Utf8               <init>
   #6 = Utf8               ()V
   #7 = Class              #8             // C
   #8 = Utf8               C
   #9 = Utf8               Code
  #10 = Utf8               LineNumberTable
  #11 = Utf8               SourceFile
  #12 = Utf8               C.java
{
  C();
    descriptor: ()V
    flags: (0x0000)
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method B."<init>":()V
         4: return
      LineNumberTable:
        line 1: 0
}
SourceFile: "C.java"
$