https://www.graalvm.org/ 
public final class com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject
  super_class: java.lang.Object
{
  public long l;
    descriptor: J
    flags: (0x0001) ACC_PUBLIC

  public java.lang.String s;
    descriptor: Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject this
         0: .line 337
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 338
            aload 0 /* this */
            ldc 42
            putfield com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject.l:J
         2: .line 339
            aload 0 /* this */
            ldc "top"
            putfield com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject.s:Ljava/lang/String;
         3: .line 337
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/oracle/truffle/api/instrumentation/test/VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject;
}
SourceFile: "VariablesScopeLegacyTest.java"
NestHost: com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest
InnerClasses:
  public CustomScopeLegacyLanguage = com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage of com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest
  public final TopScopeJavaObject = com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage$TopScopeJavaObject of com.oracle.truffle.api.instrumentation.test.VariablesScopeLegacyTest$CustomScopeLegacyLanguage