https://www.graalvm.org/ 
class com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue
  super_class: java.lang.Object
{
  final com.oracle.truffle.api.TruffleLanguage$Env env;
    descriptor: Lcom/oracle/truffle/api/TruffleLanguage$Env;
    flags: (0x0010) ACC_FINAL

  final java.lang.Thread thread;
    descriptor: Ljava/lang/Thread;
    flags: (0x0010) ACC_FINAL

  void <init>(com.oracle.truffle.api.TruffleLanguage$Env, java.lang.Thread);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;Ljava/lang/Thread;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        start local 2 // java.lang.Thread t
         0: .line 729
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 730
            aload 0 /* this */
            aload 1 /* env */
            putfield com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue.env:Lcom/oracle/truffle/api/TruffleLanguage$Env;
         2: .line 731
            aload 0 /* this */
            aload 2 /* t */
            putfield com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue.thread:Ljava/lang/Thread;
         3: .line 732
            return
        end local 2 // java.lang.Thread t
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/oracle/truffle/api/test/polyglot/ContextLocalTest$LanguageThreadLocalValue;
            0    4     1   env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
            0    4     2     t  Ljava/lang/Thread;
    MethodParameters:
      Name  Flags
      env   
      t     
}
SourceFile: "ContextLocalTest.java"
NestHost: com.oracle.truffle.api.test.polyglot.ContextLocalTest
InnerClasses:
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage
  LanguageThreadLocalValue = com.oracle.truffle.api.test.polyglot.ContextLocalTest$LanguageThreadLocalValue of com.oracle.truffle.api.test.polyglot.ContextLocalTest