https://www.graalvm.org/ 
class com.oracle.truffle.api.test.polyglot.LanguageSPITest$15 extends com.oracle.truffle.api.test.polyglot.ProxyLanguage
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.test.polyglot.LanguageSPITest$15
  super_class: com.oracle.truffle.api.test.polyglot.ProxyLanguage
{
  final com.oracle.truffle.api.test.polyglot.LanguageSPITest this$0;
    descriptor: Lcom/oracle/truffle/api/test/polyglot/LanguageSPITest;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.test.polyglot.LanguageSPITest);
    descriptor: (Lcom/oracle/truffle/api/test/polyglot/LanguageSPITest;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.polyglot.LanguageSPITest$15 this
         0: .line 1017
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.test.polyglot.LanguageSPITest$15.this$0:Lcom/oracle/truffle/api/test/polyglot/LanguageSPITest;
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.test.polyglot.ProxyLanguage.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.test.polyglot.LanguageSPITest$15 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/test/polyglot/LanguageSPITest$15;
    MethodParameters:
        Name  Flags
      this$0  final

  protected void initializeContext(com.oracle.truffle.api.test.polyglot.ProxyLanguage$LanguageContext);
    descriptor: (Lcom/oracle/truffle/api/test/polyglot/ProxyLanguage$LanguageContext;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.test.polyglot.LanguageSPITest$15 this
        start local 1 // com.oracle.truffle.api.test.polyglot.ProxyLanguage$LanguageContext context
         0: .line 1020
            new java.lang.RuntimeException
            dup
            invokespecial java.lang.RuntimeException.<init>:()V
            athrow
        end local 1 // com.oracle.truffle.api.test.polyglot.ProxyLanguage$LanguageContext context
        end local 0 // com.oracle.truffle.api.test.polyglot.LanguageSPITest$15 this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lcom/oracle/truffle/api/test/polyglot/LanguageSPITest$15;
            0    1     1  context  Lcom/oracle/truffle/api/test/polyglot/ProxyLanguage$LanguageContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      context  
}
SourceFile: "LanguageSPITest.java"
EnclosingMethod: com.oracle.truffle.api.test.polyglot.LanguageSPITest.testErrorInInitializeContext:()V
NestHost: com.oracle.truffle.api.test.polyglot.LanguageSPITest
InnerClasses:
  com.oracle.truffle.api.test.polyglot.LanguageSPITest$15
  public LanguageContext = com.oracle.truffle.api.test.polyglot.ProxyLanguage$LanguageContext of com.oracle.truffle.api.test.polyglot.ProxyLanguage