http://findbugs.sourceforge.net/: Annotation the FindBugs tool supports 
public interface javax.annotation.PropertyKey extends java.lang.annotation.Annotation
  minor version: 0
  major version: 59
  flags: flags: (0x2601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT, ACC_ANNOTATION
  this_class: javax.annotation.PropertyKey
  super_class: java.lang.Object
{
  public abstract javax.annotation.meta.When when();
    descriptor: ()Ljavax/annotation/meta/When;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    AnnotationDefault: javax.annotation.meta.When.ALWAYS:Ljavax/annotation/meta/When;
}
SourceFile: "PropertyKey.java"
    RuntimeVisibleAnnotations: 
      java.lang.annotation.Documented()
      javax.annotation.meta.TypeQualifier()
      java.lang.annotation.Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME:Ljava/lang/annotation/RetentionPolicy;)