https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
public class com.google.common.eventbus.DeadEvent
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.google.common.eventbus.DeadEvent
  super_class: java.lang.Object
{
  private final java.lang.Object source;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.lang.Object event;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.eventbus.DeadEvent this
        start local 1 // java.lang.Object source
        start local 2 // java.lang.Object event
         0: .line 43
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 44
            aload 0 /* this */
            aload 1 /* source */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            putfield com.google.common.eventbus.DeadEvent.source:Ljava/lang/Object;
         2: .line 45
            aload 0 /* this */
            aload 2 /* event */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            putfield com.google.common.eventbus.DeadEvent.event:Ljava/lang/Object;
         3: .line 46
            return
        end local 2 // java.lang.Object event
        end local 1 // java.lang.Object source
        end local 0 // com.google.common.eventbus.DeadEvent this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/google/common/eventbus/DeadEvent;
            0    4     1  source  Ljava/lang/Object;
            0    4     2   event  Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      source  
      event   

  public java.lang.Object getSource();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.eventbus.DeadEvent this
         0: .line 55
            aload 0 /* this */
            getfield com.google.common.eventbus.DeadEvent.source:Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.eventbus.DeadEvent this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/eventbus/DeadEvent;

  public java.lang.Object getEvent();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.eventbus.DeadEvent this
         0: .line 65
            aload 0 /* this */
            getfield com.google.common.eventbus.DeadEvent.event:Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.eventbus.DeadEvent this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/eventbus/DeadEvent;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.common.eventbus.DeadEvent this
         0: .line 70
            aload 0 /* this */
            invokestatic com.google.common.base.MoreObjects.toStringHelper:(Ljava/lang/Object;)Lcom/google/common/base/MoreObjects$ToStringHelper;
            ldc "source"
            aload 0 /* this */
            getfield com.google.common.eventbus.DeadEvent.source:Ljava/lang/Object;
            invokevirtual com.google.common.base.MoreObjects$ToStringHelper.add:(Ljava/lang/String;Ljava/lang/Object;)Lcom/google/common/base/MoreObjects$ToStringHelper;
            ldc "event"
            aload 0 /* this */
            getfield com.google.common.eventbus.DeadEvent.event:Ljava/lang/Object;
            invokevirtual com.google.common.base.MoreObjects$ToStringHelper.add:(Ljava/lang/String;Ljava/lang/Object;)Lcom/google/common/base/MoreObjects$ToStringHelper;
            invokevirtual com.google.common.base.MoreObjects$ToStringHelper.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.google.common.eventbus.DeadEvent this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/eventbus/DeadEvent;
}
SourceFile: "DeadEvent.java"
InnerClasses:
  public final ToStringHelper = com.google.common.base.MoreObjects$ToStringHelper of com.google.common.base.MoreObjects
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.Beta()