https://spring.io/projects/spring-boot: Spring Boot (Pivotal Software, Inc.) 
public class org.springframework.boot.availability.ApplicationAvailabilityBean implements org.springframework.boot.availability.ApplicationAvailability, org.springframework.context.ApplicationListener<org.springframework.boot.availability.AvailabilityChangeEvent<?>>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.springframework.boot.availability.ApplicationAvailabilityBean
  super_class: java.lang.Object
{
  private final java.util.Map<java.lang.Class<? extends org.springframework.boot.availability.AvailabilityState>, org.springframework.boot.availability.AvailabilityChangeEvent<?>> events;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/Class<+Lorg/springframework/boot/availability/AvailabilityState;>;Lorg/springframework/boot/availability/AvailabilityChangeEvent<*>;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
         0: .line 34
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 37
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            putfield org.springframework.boot.availability.ApplicationAvailabilityBean.events:Ljava/util/Map;
         2: .line 34
            return
        end local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/springframework/boot/availability/ApplicationAvailabilityBean;

  public <S extends org.springframework.boot.availability.AvailabilityState> S getState(java.lang.Class<S>, );
    descriptor: (Ljava/lang/Class;Lorg/springframework/boot/availability/AvailabilityState;)Lorg/springframework/boot/availability/AvailabilityState;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=3
        start local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
        start local 1 // java.lang.Class stateType
        start local 2 // org.springframework.boot.availability.AvailabilityState defaultState
         0: .line 41
            aload 1 /* stateType */
            ldc "StateType must not be null"
            invokestatic org.springframework.util.Assert.notNull:(Ljava/lang/Object;Ljava/lang/String;)V
         1: .line 42
            aload 2 /* defaultState */
            ldc "DefaultState must not be null"
            invokestatic org.springframework.util.Assert.notNull:(Ljava/lang/Object;Ljava/lang/String;)V
         2: .line 43
            aload 0 /* this */
            aload 1 /* stateType */
            invokevirtual org.springframework.boot.availability.ApplicationAvailabilityBean.getState:(Ljava/lang/Class;)Lorg/springframework/boot/availability/AvailabilityState;
            astore 3 /* state */
        start local 3 // org.springframework.boot.availability.AvailabilityState state
         3: .line 44
            aload 3 /* state */
            ifnull 4
            aload 3 /* state */
            goto 5
      StackMap locals: org.springframework.boot.availability.AvailabilityState
      StackMap stack:
         4: aload 2 /* defaultState */
      StackMap locals:
      StackMap stack: org.springframework.boot.availability.AvailabilityState
         5: areturn
        end local 3 // org.springframework.boot.availability.AvailabilityState state
        end local 2 // org.springframework.boot.availability.AvailabilityState defaultState
        end local 1 // java.lang.Class stateType
        end local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    6     0          this  Lorg/springframework/boot/availability/ApplicationAvailabilityBean;
            0    6     1     stateType  Ljava/lang/Class<TS;>;
            0    6     2  defaultState  TS;
            3    6     3         state  TS;
    Signature: <S::Lorg/springframework/boot/availability/AvailabilityState;>(Ljava/lang/Class<TS;>;TS;)TS;
    MethodParameters:
              Name  Flags
      stateType     
      defaultState  

  public <S extends org.springframework.boot.availability.AvailabilityState> S getState(java.lang.Class<S>);
    descriptor: (Ljava/lang/Class;)Lorg/springframework/boot/availability/AvailabilityState;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
        start local 1 // java.lang.Class stateType
         0: .line 49
            aload 0 /* this */
            aload 1 /* stateType */
            invokevirtual org.springframework.boot.availability.ApplicationAvailabilityBean.getLastChangeEvent:(Ljava/lang/Class;)Lorg/springframework/boot/availability/AvailabilityChangeEvent;
            astore 2 /* event */
        start local 2 // org.springframework.boot.availability.AvailabilityChangeEvent event
         1: .line 50
            aload 2 /* event */
            ifnull 2
            aload 2 /* event */
            invokevirtual org.springframework.boot.availability.AvailabilityChangeEvent.getState:()Lorg/springframework/boot/availability/AvailabilityState;
            goto 3
      StackMap locals: org.springframework.boot.availability.AvailabilityChangeEvent
      StackMap stack:
         2: aconst_null
      StackMap locals:
      StackMap stack: org.springframework.boot.availability.AvailabilityState
         3: areturn
        end local 2 // org.springframework.boot.availability.AvailabilityChangeEvent event
        end local 1 // java.lang.Class stateType
        end local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    4     0       this  Lorg/springframework/boot/availability/ApplicationAvailabilityBean;
            0    4     1  stateType  Ljava/lang/Class<TS;>;
            1    4     2      event  Lorg/springframework/boot/availability/AvailabilityChangeEvent<TS;>;
    Signature: <S::Lorg/springframework/boot/availability/AvailabilityState;>(Ljava/lang/Class<TS;>;)TS;
    MethodParameters:
           Name  Flags
      stateType  

  public <S extends org.springframework.boot.availability.AvailabilityState> org.springframework.boot.availability.AvailabilityChangeEvent<S> getLastChangeEvent(java.lang.Class<S>);
    descriptor: (Ljava/lang/Class;)Lorg/springframework/boot/availability/AvailabilityChangeEvent;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
        start local 1 // java.lang.Class stateType
         0: .line 56
            aload 0 /* this */
            getfield org.springframework.boot.availability.ApplicationAvailabilityBean.events:Ljava/util/Map;
            aload 1 /* stateType */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.springframework.boot.availability.AvailabilityChangeEvent
            areturn
        end local 1 // java.lang.Class stateType
        end local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    1     0       this  Lorg/springframework/boot/availability/ApplicationAvailabilityBean;
            0    1     1  stateType  Ljava/lang/Class<TS;>;
    Signature: <S::Lorg/springframework/boot/availability/AvailabilityState;>(Ljava/lang/Class<TS;>;)Lorg/springframework/boot/availability/AvailabilityChangeEvent<TS;>;
    MethodParameters:
           Name  Flags
      stateType  

  public void onApplicationEvent(org.springframework.boot.availability.AvailabilityChangeEvent<?>);
    descriptor: (Lorg/springframework/boot/availability/AvailabilityChangeEvent;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
        start local 1 // org.springframework.boot.availability.AvailabilityChangeEvent event
         0: .line 61
            aload 0 /* this */
            aload 1 /* event */
            invokevirtual org.springframework.boot.availability.AvailabilityChangeEvent.getState:()Lorg/springframework/boot/availability/AvailabilityState;
            invokevirtual org.springframework.boot.availability.ApplicationAvailabilityBean.getStateType:(Lorg/springframework/boot/availability/AvailabilityState;)Ljava/lang/Class;
            astore 2 /* stateType */
        start local 2 // java.lang.Class stateType
         1: .line 62
            aload 0 /* this */
            getfield org.springframework.boot.availability.ApplicationAvailabilityBean.events:Ljava/util/Map;
            aload 2 /* stateType */
            aload 1 /* event */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         2: .line 63
            return
        end local 2 // java.lang.Class stateType
        end local 1 // org.springframework.boot.availability.AvailabilityChangeEvent event
        end local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0       this  Lorg/springframework/boot/availability/ApplicationAvailabilityBean;
            0    3     1      event  Lorg/springframework/boot/availability/AvailabilityChangeEvent<*>;
            1    3     2  stateType  Ljava/lang/Class<+Lorg/springframework/boot/availability/AvailabilityState;>;
    Signature: (Lorg/springframework/boot/availability/AvailabilityChangeEvent<*>;)V
    MethodParameters:
       Name  Flags
      event  

  private java.lang.Class<? extends org.springframework.boot.availability.AvailabilityState> getStateType(org.springframework.boot.availability.AvailabilityState);
    descriptor: (Lorg/springframework/boot/availability/AvailabilityState;)Ljava/lang/Class;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
        start local 1 // org.springframework.boot.availability.AvailabilityState state
         0: .line 67
            aload 1 /* state */
            instanceof java.lang.Enum
            ifeq 2
         1: .line 68
            aload 1 /* state */
            checkcast java.lang.Enum
            invokevirtual java.lang.Enum.getDeclaringClass:()Ljava/lang/Class;
            areturn
         2: .line 70
      StackMap locals:
      StackMap stack:
            aload 1 /* state */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            areturn
        end local 1 // org.springframework.boot.availability.AvailabilityState state
        end local 0 // org.springframework.boot.availability.ApplicationAvailabilityBean this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lorg/springframework/boot/availability/ApplicationAvailabilityBean;
            0    3     1  state  Lorg/springframework/boot/availability/AvailabilityState;
    Signature: (Lorg/springframework/boot/availability/AvailabilityState;)Ljava/lang/Class<+Lorg/springframework/boot/availability/AvailabilityState;>;
    MethodParameters:
       Name  Flags
      state  

  public void onApplicationEvent(org.springframework.context.ApplicationEvent);
    descriptor: (Lorg/springframework/context/ApplicationEvent;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast org.springframework.boot.availability.AvailabilityChangeEvent
            invokevirtual org.springframework.boot.availability.ApplicationAvailabilityBean.onApplicationEvent:(Lorg/springframework/boot/availability/AvailabilityChangeEvent;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lorg/springframework/boot/availability/ApplicationAvailability;Lorg/springframework/context/ApplicationListener<Lorg/springframework/boot/availability/AvailabilityChangeEvent<*>;>;
SourceFile: "ApplicationAvailabilityBean.java"