https://www.graalvm.org/ 
public abstract class com.oracle.svm.hosted.dashboard.ToJson$JsonObject extends com.oracle.svm.hosted.dashboard.ToJson$JsonValue
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.svm.hosted.dashboard.ToJson$JsonObject
  super_class: com.oracle.svm.hosted.dashboard.ToJson$JsonValue
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.hosted.dashboard.ToJson$JsonObject this
         0: .line 310
            aload 0 /* this */
            invokespecial com.oracle.svm.hosted.dashboard.ToJson$JsonValue.<init>:()V
            return
        end local 0 // com.oracle.svm.hosted.dashboard.ToJson$JsonObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/hosted/dashboard/ToJson$JsonObject;

  public static com.oracle.svm.hosted.dashboard.ToJson$JsonObject get(java.util.stream.Stream<java.lang.String>, java.util.function.Function<java.lang.String, com.oracle.svm.hosted.dashboard.ToJson$JsonValue>);
    descriptor: (Ljava/util/stream/Stream;Ljava/util/function/Function;)Lcom/oracle/svm/hosted/dashboard/ToJson$JsonObject;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // java.util.stream.Stream names
        start local 1 // java.util.function.Function func
         0: .line 313
            aload 0 /* names */
            ifnull 1
            aload 1 /* func */
            ifnonnull 2
      StackMap locals:
      StackMap stack:
         1: aconst_null
            goto 3
      StackMap locals:
      StackMap stack:
         2: new com.oracle.svm.hosted.dashboard.ToJson$JsonObject$1
            dup
            aload 0 /* names */
            aload 1 /* func */
            invokespecial com.oracle.svm.hosted.dashboard.ToJson$JsonObject$1.<init>:(Ljava/util/stream/Stream;Ljava/util/function/Function;)V
      StackMap locals:
      StackMap stack: com.oracle.svm.hosted.dashboard.ToJson$JsonObject$1
         3: areturn
        end local 1 // java.util.function.Function func
        end local 0 // java.util.stream.Stream names
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0  names  Ljava/util/stream/Stream<Ljava/lang/String;>;
            0    4     1   func  Ljava/util/function/Function<Ljava/lang/String;Lcom/oracle/svm/hosted/dashboard/ToJson$JsonValue;>;
    Signature: (Ljava/util/stream/Stream<Ljava/lang/String;>;Ljava/util/function/Function<Ljava/lang/String;Lcom/oracle/svm/hosted/dashboard/ToJson$JsonValue;>;)Lcom/oracle/svm/hosted/dashboard/ToJson$JsonObject;
    MethodParameters:
       Name  Flags
      names  
      func   

  abstract java.util.stream.Stream<java.lang.String> getNames();
    descriptor: ()Ljava/util/stream/Stream;
    flags: (0x0400) ACC_ABSTRACT
    Signature: ()Ljava/util/stream/Stream<Ljava/lang/String;>;

  abstract com.oracle.svm.hosted.dashboard.ToJson$JsonValue getValue(java.lang.String);
    descriptor: (Ljava/lang/String;)Lcom/oracle/svm/hosted/dashboard/ToJson$JsonValue;
    flags: (0x0400) ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      name  

  final void dump(java.io.PrintWriter, com.oracle.svm.hosted.dashboard.ToJson);
    descriptor: (Ljava/io/PrintWriter;Lcom/oracle/svm/hosted/dashboard/ToJson;)V
    flags: (0x0010) ACC_FINAL
    Code:
      stack=4, locals=4, args_size=3
        start local 0 // com.oracle.svm.hosted.dashboard.ToJson$JsonObject this
        start local 1 // java.io.PrintWriter writer
        start local 2 // com.oracle.svm.hosted.dashboard.ToJson access
         0: .line 332
            aload 0 /* this */
            invokevirtual com.oracle.svm.hosted.dashboard.ToJson$JsonObject.build:()V
         1: .line 333
            aload 0 /* this */
            invokevirtual com.oracle.svm.hosted.dashboard.ToJson$JsonObject.getNames:()Ljava/util/stream/Stream;
            astore 3 /* names */
        start local 3 // java.util.stream.Stream names
         2: .line 334
            aload 3 /* names */
            ifnonnull 5
         3: .line 335
            getstatic com.oracle.svm.hosted.dashboard.ToJson$JsonValue.NULL:Lcom/oracle/svm/hosted/dashboard/ToJson$JsonValue;
            aload 1 /* writer */
            aload 2 /* access */
            invokevirtual com.oracle.svm.hosted.dashboard.ToJson$JsonValue.dump:(Ljava/io/PrintWriter;Lcom/oracle/svm/hosted/dashboard/ToJson;)V
         4: .line 336
            goto 6
         5: .line 337
      StackMap locals: java.util.stream.Stream
      StackMap stack:
            aload 2 /* access */
            aload 1 /* writer */
            aload 3 /* names */
            aload 0 /* this */
            invokedynamic apply(Lcom/oracle/svm/hosted/dashboard/ToJson$JsonObject;)Ljava/util/function/Function;
              Bootstrap: invokestatic java.lang.invoke.LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
                Method arguments:
                  (Ljava/lang/Object;)Ljava/lang/Object;
                  com/oracle/svm/hosted/dashboard/ToJson$JsonObject.getValue(Ljava/lang/String;)Lcom/oracle/svm/hosted/dashboard/ToJson$JsonValue; (5)
                  (Ljava/lang/String;)Lcom/oracle/svm/hosted/dashboard/ToJson$JsonValue;
            invokevirtual com.oracle.svm.hosted.dashboard.ToJson.dumpObject:(Ljava/io/PrintWriter;Ljava/util/stream/Stream;Ljava/util/function/Function;)V
         6: .line 339
      StackMap locals:
      StackMap stack:
            return
        end local 3 // java.util.stream.Stream names
        end local 2 // com.oracle.svm.hosted.dashboard.ToJson access
        end local 1 // java.io.PrintWriter writer
        end local 0 // com.oracle.svm.hosted.dashboard.ToJson$JsonObject this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    this  Lcom/oracle/svm/hosted/dashboard/ToJson$JsonObject;
            0    7     1  writer  Ljava/io/PrintWriter;
            0    7     2  access  Lcom/oracle/svm/hosted/dashboard/ToJson;
            2    7     3   names  Ljava/util/stream/Stream<Ljava/lang/String;>;
    MethodParameters:
        Name  Flags
      writer  
      access  
}
SourceFile: "ToJson.java"
NestHost: com.oracle.svm.hosted.dashboard.ToJson
InnerClasses:
  public abstract JsonObject = com.oracle.svm.hosted.dashboard.ToJson$JsonObject of com.oracle.svm.hosted.dashboard.ToJson
  com.oracle.svm.hosted.dashboard.ToJson$JsonObject$1
  public abstract JsonValue = com.oracle.svm.hosted.dashboard.ToJson$JsonValue of com.oracle.svm.hosted.dashboard.ToJson
  public final Lookup = java.lang.invoke.MethodHandles$Lookup of java.lang.invoke.MethodHandles