https://openjdk.java.net/ 
public interface javax.tools.DiagnosticListener<S>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.tools.DiagnosticListener
  super_class: java.lang.Object
{
  public abstract void report(javax.tools.Diagnostic<? extends S>);
    descriptor: (Ljavax/tools/Diagnostic;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljavax/tools/Diagnostic<+TS;>;)V
    MethodParameters:
            Name  Flags
      diagnostic  
}
Signature: <S:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "DiagnosticListener.java"