import de.javakaffee.kryoserializers.CollectionsEmptyMapSerializer; //导入依赖的package包/类
public static Kryo createKryoInstance() {
	Kryo kryo = new Kryo();
	
	// add custom serialisers to work with joda time (the kryo version that we get when including spark as a dependency cannot handle joda time by default)
	// see https://github.com/magro/kryo-serializers
	
	kryo.register( Arrays.asList( "" ).getClass(), new ArraysAsListSerializer() );
	kryo.register( Collections.EMPTY_LIST.getClass(), new CollectionsEmptyListSerializer() );
	kryo.register( Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer() );
	kryo.register( Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer() );
	kryo.register( Collections.singletonList( "" ).getClass(), new CollectionsSingletonListSerializer() );
	kryo.register( Collections.singleton( "" ).getClass(), new CollectionsSingletonSetSerializer() );
	kryo.register( Collections.singletonMap( "", "" ).getClass(), new CollectionsSingletonMapSerializer() );
	kryo.register( GregorianCalendar.class, new GregorianCalendarSerializer() );
	kryo.register( InvocationHandler.class, new JdkProxySerializer() );
	UnmodifiableCollectionsSerializer.registerSerializers( kryo );
	SynchronizedCollectionsSerializer.registerSerializers( kryo );

	// custom serializers for non-jdk libs
	
	return kryo;
}
 

import de.javakaffee.kryoserializers.CollectionsEmptyMapSerializer; //导入依赖的package包/类
@Override
    protected Kryo initialValue() {
      Kryo ret = new Kryo();
      ret.setReferences(true);
      ret.setInstantiatorStrategy(new DefaultInstantiatorStrategy(new StdInstantiatorStrategy()));

      ret.register(Arrays.asList("").getClass(), new ArraysAsListSerializer());
      ret.register(Collections.EMPTY_LIST.getClass(), new CollectionsEmptyListSerializer());
      ret.register(Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer());
      ret.register(Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer());
      ret.register(Collections.singletonList("").getClass(), new CollectionsSingletonListSerializer());
      ret.register(Collections.singleton("").getClass(), new CollectionsSingletonSetSerializer());
      ret.register(Collections.singletonMap("", "").getClass(), new CollectionsSingletonMapSerializer());
      ret.register(GregorianCalendar.class, new GregorianCalendarSerializer());
      ret.register(InvocationHandler.class, new JdkProxySerializer());
      UnmodifiableCollectionsSerializer.registerSerializers(ret);
      SynchronizedCollectionsSerializer.registerSerializers(ret);

// custom serializers for non-jdk libs

// register CGLibProxySerializer, works in combination with the appropriate action in handleUnregisteredClass (see below)
      ret.register(CGLibProxySerializer.CGLibProxyMarker.class, new CGLibProxySerializer());
// joda DateTime, LocalDate and LocalDateTime
      ret.register(LocalDate.class, new JodaLocalDateSerializer());
      ret.register(LocalDateTime.class, new JodaLocalDateTimeSerializer());
// guava ImmutableList, ImmutableSet, ImmutableMap, ImmutableMultimap, UnmodifiableNavigableSet
      ImmutableListSerializer.registerSerializers(ret);
      ImmutableSetSerializer.registerSerializers(ret);
      ImmutableMapSerializer.registerSerializers(ret);
      ImmutableMultimapSerializer.registerSerializers(ret);
      return ret;
    }
 

import de.javakaffee.kryoserializers.CollectionsEmptyMapSerializer; //导入依赖的package包/类
/**
 * Initialize and register classes with kryo.
 */
public void initialize() {
    // Register types we know about and do not require external configuration
    kryo.register(ArrayList.class);
    kryo.register(BasicCredentialMetaData.class);
    kryo.register(Class.class, new DefaultSerializers.ClassSerializer());
    kryo.register(Date.class, new DefaultSerializers.DateSerializer());
    kryo.register(HardTimeoutExpirationPolicy.class);
    kryo.register(HashMap.class);
    kryo.register(LinkedHashMap.class);
    kryo.register(HashSet.class);
    kryo.register(DefaultHandlerResult.class);
    kryo.register(ImmutableAuthentication.class);
    kryo.register(MultiTimeUseOrTimeoutExpirationPolicy.class);
    kryo.register(NeverExpiresExpirationPolicy.class);
    kryo.register(RememberMeDelegatingExpirationPolicy.class);
    kryo.register(ServiceTicketImpl.class);
    kryo.register(SimpleWebApplicationServiceImpl.class, new SimpleWebApplicationServiceSerializer());
    kryo.register(ThrottledUseAndTimeoutExpirationPolicy.class);
    kryo.register(TicketGrantingTicketExpirationPolicy.class);
    kryo.register(TicketGrantingTicketImpl.class);
    kryo.register(TimeoutExpirationPolicy.class);
    kryo.register(UsernamePasswordCredential.class);
    kryo.register(SimplePrincipal.class);
    kryo.register(URL.class, new URLSerializer());
    kryo.register(URI.class, new URISerializer());
    kryo.register(Pattern.class, new RegexSerializer());
    kryo.register(UUID.class, new UUIDSerializer());
    kryo.register(EnumMap.class, new EnumMapSerializer());
    kryo.register(EnumSet.class, new EnumSetSerializer());

    // we add these ones for tests only
    kryo.register(RegisteredServiceImpl.class, new RegisteredServiceSerializer());
    kryo.register(RegexRegisteredService.class, new RegisteredServiceSerializer());

    // new serializers to manage Joda dates and immutable collections
    kryo.register(DateTime.class, new JodaDateTimeSerializer());
    kryo.register(CasDelegatingLogger.class, new DefaultSerializers.VoidSerializer());

    // from the kryo-serializers library (https://github.com/magro/kryo-serializers)
    UnmodifiableCollectionsSerializer.registerSerializers(kryo);
    ImmutableListSerializer.registerSerializers(kryo);
    ImmutableSetSerializer.registerSerializers(kryo);
    ImmutableMapSerializer.registerSerializers(kryo);
    ImmutableMultimapSerializer.registerSerializers(kryo);
    
    kryo.register(Collections.EMPTY_LIST.getClass(), new CollectionsEmptyListSerializer());
    kryo.register(Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer());
    kryo.register(Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer());

    // Register other types
    if (serializerMap != null) {
        for (final Map.Entry<Class<?>, Serializer> clazz : serializerMap.entrySet()) {
            kryo.register(clazz.getKey(), clazz.getValue());
        }
    }

    // don't reinit the registered classes after every write or read
    kryo.setAutoReset(false);
    // don't replace objects by references
    kryo.setReferences(false);
    // Catchall for any classes not explicitly registered
    kryo.setRegistrationRequired(false);
}
 

import de.javakaffee.kryoserializers.CollectionsEmptyMapSerializer; //导入依赖的package包/类
/**
 * Initialize and register classes with kryo.
 */
@PostConstruct
public void initialize() {
    // Register types we know about and do not require external configuration
    this.kryo.register(EncodedTicket.class);
    this.kryo.register(ArrayList.class);
    this.kryo.register(BasicCredentialMetaData.class);
    this.kryo.register(Class.class, new DefaultSerializers.ClassSerializer());
    this.kryo.register(ZonedDateTime.class, new ZonedDateTimeTranscoder());
    this.kryo.register(HardTimeoutExpirationPolicy.class);
    this.kryo.register(HashMap.class);
    this.kryo.register(LinkedHashMap.class);
    this.kryo.register(HashSet.class);
    this.kryo.register(DefaultHandlerResult.class);
    this.kryo.register(DefaultAuthentication.class);
    this.kryo.register(MultiTimeUseOrTimeoutExpirationPolicy.class);
    this.kryo.register(NeverExpiresExpirationPolicy.class);
    this.kryo.register(RememberMeDelegatingExpirationPolicy.class);
    this.kryo.register(ServiceTicketImpl.class);
    this.kryo.register(SimpleWebApplicationServiceImpl.class, new SimpleWebApplicationServiceSerializer());
    this.kryo.register(ThrottledUseAndTimeoutExpirationPolicy.class);
    this.kryo.register(TicketGrantingTicketExpirationPolicy.class);
    this.kryo.register(TicketGrantingTicketImpl.class);
    this.kryo.register(TimeoutExpirationPolicy.class);
    this.kryo.register(UsernamePasswordCredential.class);
    this.kryo.register(SimplePrincipal.class);
    this.kryo.register(URL.class, new URLSerializer());
    this.kryo.register(URI.class, new URISerializer());
    this.kryo.register(Pattern.class, new RegexSerializer());
    this.kryo.register(UUID.class, new UUIDSerializer());
    this.kryo.register(EnumMap.class, new EnumMapSerializer());
    this.kryo.register(EnumSet.class, new EnumSetSerializer());

    // we add these ones for tests only
    this.kryo.register(RegexRegisteredService.class, new RegisteredServiceSerializer());
    
    // from the kryo-serializers library (https://github.com/magro/kryo-serializers)
    UnmodifiableCollectionsSerializer.registerSerializers(this.kryo);
    ImmutableListSerializer.registerSerializers(this.kryo);
    ImmutableSetSerializer.registerSerializers(this.kryo);
    ImmutableMapSerializer.registerSerializers(this.kryo);
    ImmutableMultimapSerializer.registerSerializers(this.kryo);

    this.kryo.register(Collections.EMPTY_LIST.getClass(), new CollectionsEmptyListSerializer());
    this.kryo.register(Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer());
    this.kryo.register(Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer());

    // Register other types
    if (this.serializerMap != null) {
        this.serializerMap.forEach(this.kryo::register);
    }

    // don't reinit the registered classes after every write or read
    this.kryo.setAutoReset(false);
    // don't replace objects by references
    this.kryo.setReferences(false);
    // Catchall for any classes not explicitly registered
    this.kryo.setRegistrationRequired(false);
}
 

import de.javakaffee.kryoserializers.CollectionsEmptyMapSerializer; //导入依赖的package包/类
protected Kryo initialValue() {
    Kryo _kryo = new KryoReflectionFactorySupport() {

        @Override
        @SuppressWarnings( { "rawtypes", "unchecked" } )
        public Serializer<?> getDefaultSerializer( final Class type ) {
            if ( EnumSet.class.isAssignableFrom( type ) ) {
                return new EnumSetSerializer();
            }
            if ( EnumMap.class.isAssignableFrom( type ) ) {
                return new EnumMapSerializer();
            }
            if ( Collection.class.isAssignableFrom( type ) ) {
                return new CopyForIterateCollectionSerializer();
            }
            if ( Map.class.isAssignableFrom( type ) ) {
                return new CopyForIterateMapSerializer();
            }
            if ( Date.class.isAssignableFrom( type ) ) {
                return new DateSerializer( type );
            }
            return super.getDefaultSerializer( type );
        }
    };
    _kryo.setRegistrationRequired(false);
    _kryo.register( Arrays.asList( "" ).getClass(), new ArraysAsListSerializer() );
    _kryo.register( Collections.EMPTY_LIST.getClass(), new CollectionsEmptyListSerializer() );
    _kryo.register( Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer() );
    _kryo.register( Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer() );
    _kryo.register( Collections.singletonList( "" ).getClass(), new CollectionsSingletonListSerializer() );
    _kryo.register( Collections.singleton( "" ).getClass(), new CollectionsSingletonSetSerializer() );
    _kryo.register( Collections.singletonMap( "", "" ).getClass(), new CollectionsSingletonMapSerializer() );
    _kryo.register( BigDecimal.class, new BigDecimalSerializer() );
    _kryo.register( BigInteger.class, new BigIntegerSerializer() );
    //      _kryo.register( Pattern.class, new RegexSerializer() );
    //      _kryo.register( BitSet.class, new BitSetSerializer() );
    //      _kryo.register( URI.class, new URISerializer() );
    //      _kryo.register( UUID.class, new UUIDSerializer() );
    _kryo.register( GregorianCalendar.class, new GregorianCalendarSerializer() );
    _kryo.register( InvocationHandler.class, new JdkProxySerializer() );
    UnmodifiableCollectionsSerializer.registerSerializers( _kryo );
    SynchronizedCollectionsSerializer.registerSerializers( _kryo );
    //      DeflateSerializer d;      
    //      _kryo..setDefaultSerializer(CompatibleFieldSerializer.class);
    return _kryo;
}