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What's up with Wicket 8
and Java 8
Martijn Dashorst
Topicus Education

APACHE WICKET
Martijn Dashorst

Topicus Education
What's Up with Wicket 8
and Java 8?
𝛌
Martijn Dashorst

Topicus Education
twitter: @dashorst
Apache: dashorst
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Lambda's
Migration towards Wicket 8
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
Why Java 8 for Wicket 8?
• Concise, clear code with Java 8

Lambdas, Optional
• Support for Java EE 7 and Java 8 in servers
• Wish to get API right
• Semver
• Versions line up nicely 

Wicket 5 & Java 5 (wicket 1.5.x & Java 2 1.5.x)

Wicket 6 & Java 6

Wicket 7 & Java 7

Wicket 8 & Java 8
Wicket 9 → Java 9
Wicket 8.0.0 final release?
- won't ship with all bells/whistles
- might take a few months to get right (semver)
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
Everything in 7.x
Everything in 7.x
Java Eightyfication
Optional<T>, default methods, lambda's everywhere
"The ecosystem,
stupid!"
"Innovation
happens
elsewhere"
• Short list

http://wicket.apache.org/community/
• WicketStuff

https://github.com/wicketstuff
• Wicket Spring Boot

https://github.com/MarcGiffing/wicket-spring-boot
• Wicket Bootstrap

https://github.com/l0rdn1kk0n/wicket-bootstrap
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
Supported by converters
• LocalDateConverter
• LocalDateTimeConverter
• LocalTimeConverter
• Already registered for your convenience
public	interface	IConverter<C>	extends	IClusterable	
{	
				C	convertToObject(String	value,	Locale	locale)		
	 																							throws	ConversionException;	
				String	convertToString(C	value,	Locale	locale);	
}
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
I've recently ran into a few cases where while
implementing AjaxFallbackLink I forgot to test the passed
in request target for null, causing NPEs when the app was
accessed from browsers where AJAX failed for whatever
reason.
— Igor Vaynberg, 2011
AjaxFallbackLink
AjaxFallbackLink<Void>	link	=	new	AjaxFallbackLink<Void>("link")	{	
	 @Override	
	 public	void	onClick(AjaxRequestTarget	target)	
	 {	
	 	 target.add(label);	
	 }	
};
wicket 7
wicket 8
AjaxFallbackLink
AjaxFallbackLink<Void>	link	=	new	AjaxFallbackLink<Void>("link")	{	
	 @Override	
	 public	void	onClick(AjaxRequestTarget	target)	
	 {	
	 	 target.add(label);	
	 }	
};
wicket 7
wicket 8
NullPointerException
AjaxFallbackLink
AjaxFallbackLink<Void>	link	=	new	AjaxFallbackLink<Void>("link")	{	
	 @Override	
	 public	void	onClick(AjaxRequestTarget	target)	
	 {	
	 	 target.add(label);	
	 }	
};
wicket 7
wicket 8
AjaxFallbackLink<Void>	link	=	new	AjaxFallbackLink<Void>("link")	{	
	 @Override	
	 public	void	onClick(Optional<AjaxRequestTarget>	target)	
	 {	
	 	 target.ifPresent(t	->	t.add(label));	
	 }	
};
RequestCycle.get().find()
AjaxRequestTarget	target	=		
				RequestCycle.get()	
						.find(AjaxRequestTarget.class);	
target.add(studentPanel);
wicket 7
wicket 8
Optional<AjaxRequestTarget>	target	=		
				RequestCycle.get()	
						.find(AjaxRequestTarget.class);	
if(target.isPresent())	
				target.get().add(studentPanel);
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
Models
Components
Behaviors
Difficulties
Critique
𝛌
add(new	Label("lastname",		
								new	PropertyModel(person,	"lastname")));
add(new	Label("message",	"Hello,	World!"));
IModel<Account>	accountModel	=	...;	
add(new	TextField("lastname",		
							new	PropertyModel(accountModel,	"person.lastname")));
add(new	AttributeAppender("class",		
				new	AbstractReadOnlyModel<String>()	{	
								private	static	final	long	serialVersionUID	=	1L;	
			
								@Override	
								public	String	getObject()	{	
												return	isRequired()	?	"wysiwyg_required"	:	"";	
								}	
				},	"	"));
Nested model example
public	class	AbsenteePreferenceModel		
				extends	LoadableDetachableModel<AbsenteePreference>	{	
		@Inject	private	EmployeeDAO	empDao;	
		@Inject	private	LocationDAO	locDAO;	
		@Override	
		protected	AbsenteePreference	load()	{	
				IridiumContext	ctx	=	IridiumContext.get();	
				AbsentieInvoerVoorkeur	pref	=	
								empDao.getAbsenteePref(ctx.getEmployee());	
				if	(pref	==	null)	{	
						voorkeur	=	locDAO	
										.getAbsenteePref(ctx.getDefaultLocation());	
				}	
				return	pref;	
		}	
}
(1/2)
Nested model example
add(new	CheckBox("showAll",	
							new	PropertyModel<>(prefModel,	"showAll")));	
add(new	CheckBox("studentInfo",	
							new	PropertyModel<>(prefModel,	"showStudentInfo")));	
add(new	CheckBox("barcode",	
							new	PropertyModel<>(prefModel,	"showBarCode")));	
add(new	DropDownChoice("reason",	
							new	PropertyModel<>(prefModel,	"defaultReason"),	
							absenteeReasonsModel));
(2/2)
add(new	Label("lastname",		
								new	PropertyModel(person,	"lastname")));
add(new	Label("message",	"Hello,	World!"));
IModel<Account>	accountModel	=	...;	
add(new	TextField("lastname",		
							new	PropertyModel(accountModel,	"person.lastname")));
LambdaModel example
add(new	Label("message",	"Hello,	World!"));	
wicket 7
wicket 8
add(new	Label("message",	"Hello,	World!"));
LambdaModel example
add(new	Label("lastname",		
								new	PropertyModel(person,	"lastname")));	
wicket 7
wicket 8
add(new	Label("lastname",	()	->	person.getLastName()));	
add(new	Label("lastname",	person::getLastName));
LambdaModel example
add(new	Label("lastName",	
							new	PropertyModel<>(personModel,	"lastName")));
wicket 7
wicket 8
add(new	Label("lastName",	
							LambdaModel.of(personModel,	Person::getLastName)));
LambdaModel example
add(new	Label("lastName",	
						new	PropertyModel<>(accountModel,	"person.lastName")));
wicket 7
wicket 8
add(new	Label("lastName",	
								LambdaModel.of(accountModel,	Account::getPerson)	
																			.map(Person::getLastName)));
LambdaModel example
add(new	AttributeAppender("class",		
				new	AbstractReadOnlyModel<String>()	{	
								private	static	final	long	serialVersionUID	=	1L;	
			
								@Override	
								public	String	getObject()	{	
												return	isRequired()	?	"wysiwyg_required"	:	"";	
								}	
				},	"	"));
wicket 7
wicket 8
add(new	AttributeAppender("class",	
								()	->	isRequired()	?	"wysiwyg_required"	:	""),	"	"));
LambdaModel example
add(new	CheckBox("showAll",	
							new	PropertyModel<>(prefModel,	"showAll")));
wicket 7
wicket 8
add(new	CheckBox("showAll",	
							LambdaModel.of(prefModel,		
											AbsentieInvoerVoorkeur::isShowAll,		
											AbsentieInvoerVoorkeur::setShowAll)));
LambdaModel example
add(new	DropDownChoice("reason",	
							new	PropertyModel<>(prefModel,	"defaultReason"),	
							absenteeReasonsModel));
wicket 7
wicket 8
add(new	DropDownChoice("reason",	
								LambdaModel.of(prefModel,		
												AbsentieInvoerVoorkeur::getDefaultReason,		
												AbsentieInvoerVoorkeur::setDefaultReason)),	
								absenteeReasonsModel));
Models
Components
Behaviors
Difficulties
Critique
𝛌
Models accept lambda's directly
add(new	Label<>("name",	PropertyModel.of(person,	"name"));
wicket 7
wicket 8
IModels accept lambda's directly
add(new	Label<>("name",	PropertyModel.of(person,	"name"));
wicket 7
wicket 8
add(new	Label<>("name",	()	->	person.getName()));	
add(new	Label<>("name",	person::getName));
Typical component
add(new	Link<Cheese>("addToCart",	cheeseModel)	{	
		@Override	
		public	void	onClick()	{	
				Cheese	cheese	=	getModelObject();	
				CheesrSession.get().add(cheese);	
		}	
});
wicket 7
wicket 8
Typical component
add(new	Link<Cheese>("addToCart",	cheeseModel)	{	
		@Override	
		public	void	onClick()	{	
				Cheese	cheese	=	getModelObject();	
				CheesrSession.get().add(cheese);	
		}	
});
wicket 7
wicket 8
add(Link.onClick("addToCart",	()	->	{	
				Cheese	cheese	=	cheeseModel.getObject();	
				CheesrSession.get().add(cheese);	
		});
• Form
• Link
• Button
• SubmitLink
• LambdaColumn (for dataview)
Models
Components
Behaviors
Difficulties
Critique
𝛌
Behavior
new	Behavior()	{	
		@Override	
		public	void	onComponentTag(Component	c,	ComponentTag	t)	{	
				tag.getAttributes().put("style",	"color:red");	
		}	
}
wicket 7
wicket 8
Behavior
new	Behavior()	{	
		@Override	
		public	void	onComponentTag(Component	c,	ComponentTag	t)	{	
				tag.getAttributes().put("style",	"color:red");	
		}	
}
wicket 7
wicket 8
Behavior.onComponentTag(t	->	t.getAttributes()	
																														.put("style",	"color:red"));	
Behavior.onAttribute("style",	s	->	"color:red");
Models
Components
Behaviors
Difficulties
Critique
𝛌
Make everything serializable
A first attempt for Lambda's
public	abstract	class	Link	extends	AbstractLink	{	
		public	abstract	void	onClick();	
		public	static	<T>	Link<T>	onClick(String	id,		
																																				Consumer<T>	handler)	{	
				return	new	Link<T>(id)	{	
						@Override	
						public	void	onClick()	{	
								handler.accept(this);	
						}	
				};	
		}	
}
A first attempt for Lambda's
add(Link.onClick("link",	c->	{}));	
Caused by: java.io.NotSerializableException:
com.martijndashorst.wicketbenchmarks.ClosurePage$$Lambda$18/38997010
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
add(Link.onClick("link",	c->	{}));
A first attempt for Lambda's
public	abstract	class	Link	extends	AbstractLink	{	
		public	abstract	void	onClick();	
		public	static	<T>	Link<T>	onClick(String	id,		
																																				Consumer<T>	handler)	{	
}
Not Serializable
Attempt 2: 

Wicket's own Lambda's
interface	WicketConsumer	extends	Serializable	{	
		...	
}	
interface	WicketSupplier	extends	Serializable	{}	
interface	WicketFunction	extends	Serializable	{}	
interface	WicketPredicate	extends	Serializable	{}	
interface	WicketBiConsumer	extends	Serializable{}	
interface	WicketBiSupplier	extends	Serializable{}	
...
• Not reusable outside Wicket
• Conflicts with other Serializable Functional Interfaces
Attempt 3
• jdk-serializable-functional

Jakub Danek

https://github.com/danekja/jdk-serializable-functional
• No dependencies
Attempt 3: 

jdk-serializable-functional
interface	SerializableConsumer	extends	Serializable	{	
		...	
}	
interface	SerializableSupplier	extends	Serializable	{}	
interface	SerializableFunction	extends	Serializable	{}	
interface	SerializablePredicate	extends	Serializable	{}	
interface	SerializableBiConsumer	extends	Serializable{}	
interface	SerializableBiSupplier	extends	Serializable{}	
...
add(Link.onClick("link",	c->	{}));
A first attempt for Lambda's
public	abstract	class	Link	extends	AbstractLink	{	
		public	abstract	void	onClick();	
		public	static	<T>	Link<T>	onClick(String	id,		
																											SerializableConsumer<T>	handler)	{	
}
Serializable
Closures capture too much
Capturing the world
Person	person	=	peopleDAO.find(...);	
add(SubmitLink.onSubmit("save",	c->	{	
				peopleDao.save(person);	
		}));
Capturing the world
Person	person	=	peopleDAO.find(...);	
add(SubmitLink.onSubmit("save",	c->	{	
				peopleDao.save(person);	
		}));	
public	MyPage(Object	o)	{	
		add(Link.onClick("link",	l	->	System.out.println(o)));	
}	
Not Serializable
Capturing the world
Person	person	=	peopleDAO.find(...);	
add(SubmitLink.onSubmit("save",	c->	{	
				peopleDao.save(person);	
		}));	
public	MyPage(Object	o)	{	
		add(Link.onClick("link",	l	->	System.out.println(o)));	
		add(new	Link("link2")	{	
				public	void	onClick()	{	
						System.out.println(o);	
				}	
		}	
}	
Not Serializable
Models
Components
Behaviors
Difficulties
Critique
𝛌
DISCLAIMER
This critique is not about the work of
Wicket developers working hard on
Wicket 8.
Rather it is a measure of the maturity of
the current state of Wicket 8. A lot of work
went into it, there's still work to be done.
Closure clarity
What is the output?
setDefaultModel(Model.of("Page	model"));	
add(Link.onClick("id",	s	->	{	
	 System.out.println("Model:	"	+	getDefaultModelObject());	
}).setDefaultModel(Model.of("Link	model")));	
wicket 7
wicket 8
In a page:
Output:
What is the output?
setDefaultModel(Model.of("Page	model"));	
add(Link.onClick("id",	s	->	{	
	 System.out.println("Model:	"	+	getDefaultModelObject());	
}).setDefaultModel(Model.of("Link	model")));	
wicket 7
wicket 8
Model:	Page	model	
In a page:
Output:
Combinatorial explosion of
factory methods
Typical component
add(new	Link<Cheese>("addToCart",	cheeseModel)	{	
		private	static	final	long	serialVersionUID	=	1L;	
		@Override	
		public	void	onClick()	{	
				Cheese	cheese	=	getModelObject();	
				CheesrSession.get().add(cheese);	
		}	
});
wicket 7
wicket 8
Typical component
add(new	Link<Cheese>("addToCart",	cheeseModel)	{	
		private	static	final	long	serialVersionUID	=	1L;	
		@Override	
		public	void	onClick()	{	
				Cheese	cheese	=	getModelObject();	
				CheesrSession.get().add(cheese);	
		}	
});
wicket 7
wicket 8
add(Link.onClick("addToCart",	cheeseModel,	()	->	{	
				Cheese	cheese	=	cheeseModel.getObject();	
				CheesrSession.get().add(cheese);	
});
Typical component
add(new	Link<Cheese>("addToCart",	cheeseModel)	{	
		private	static	final	long	serialVersionUID	=	1L;	
		@Override	
		public	void	onClick()	{	
				Cheese	cheese	=	getModelObject();	
				CheesrSession.get().add(cheese);	
		}	
		@Override	
		public	void	onConfigure()	{	
				Cheese	cheese	=	getModelObject();	
				setVisible(cheese.isInStock());	
		}	
});
• onInitialize
• onConfigure
• onBeforeRender
• onRender
• onComponentTag
• onAfterRender

• onClick
• onSubmit
• onError
• isVisible
• isEnabled
• ...
Less syntax: less readable
Typical component
add(new	AjaxSubmitLink<Void>("register")	{	
		private	static	final	long	serialVersionUID	=	1L;	
		@Override	
		public	void	onSubmit(AjaxRequestTarget	target)	{	
				Person	person	=	registrationModel.getObject();	
				registrationService.registerNewStudent(person);	
				registrationWizard.next();	
				target.add(registrationWizard);	
		}	
		@Override	
		public	void	onError()	{	
				target.add(feedbackPanel);	
	}	
});
Typical lambda
add(AjaxSubmitLink.onSubmit("register",	
		(target)	->	{	
				Person	person	=	registrationModel.getObject();	
				registrationService.registerNewStudent(person);	
				registrationWizard.next();	
				target.add(registrationWizard);	
		},	(target)	->	{	
				target.add(feedbackPanel);	
	}	
);
Typical lambda
add(AjaxSubmitLink.onSubmit("register",	
		(target)	->	{	
				Person	person	=	registrationModel.getObject();	
				registrationService.registerNewStudent(person);	
				registrationWizard.next();	
				target.add(registrationWizard);	
		},	(target)	->	{	
				target.add(feedbackPanel);	
	}	
);	
add(AjaxSubmitLink.onSubmit("register",	
		page::onRegister,	page::onSubmitError	
	}	
);
Where's the Component?
Bi-Consuming Behavior
add(new	Behavior()	{	
		public	void	onComponentTag(Component	c,	ComponentTag	t)	{	
		}	
}
wicket 7
wicket 8
add(Behavior.onComponentTag(t	->	{	
				//	where's	the	component?	
		});
Model Performance
DISCLAIMER
These benchmarks are based on the
current version. Newer versions will
perform differently (possibly better).
A micro benchmark does not reflect actual
application performance.
Benchmarks
https://github.com/dashorst/wicket-benchmarks
Which construct performs better?
new	AbstractReadOnlyModel<String>()	{	
		@Override	
		public	String	getObject()	{	
				return	accountModel	
						.getObject()	
						.getPerson()	
						.getName();	
		}	
}
PropertyModel	
		.of(accountModel,	"person.name")	
		.getObject();
Model.of(accountModel)	
				.map(Account::getPerson)	
				.map(Person::getName)	
				.getObject();
0
40
80
120
160
200
PropertyM
odel
C
hained
Lam
bda
D
irectLam
bda
AbstractReadO
nlyM
odel
D
irect
164x
120x
99x
70x
1x
Memory efficiency
new Account()
Account Person
name: String
1n
96
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
Account Person
name: String
1n
96
112
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
Account Person
name: String
1n
96
112
16
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
Account Person
name: String
1n
96
112
16
40
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
Account Person
name: String
1n
96
112
16
40
24
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
Account Person
name: String
1n
96
112
16
40
24
56
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
LambdaModel.of(()->am().getPerson().getName())
Account Person
name: String
1n
96
112
16
40
24
56
72
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
LambdaModel.of(()->am().getPerson().getName())
model.map(A::getPerson).map(P::getName)
Account Person
name: String
1n
96
112
16
40
24
56
72
120
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
LambdaModel.of(()->am().getPerson().getName())
model.map(A::getPerson).map(P::getName)
LambdaModel.of(am, A::getPerson).mapP::getNa
Account Person
name: String
1n
96
112
16
40
24
56
72
120
160
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
LambdaModel.of(()->am().getPerson().getName())
model.map(A::getPerson).map(P::getName)
LambdaModel.of(am, A::getPerson).mapP::getNa
PropertyModel.of(am, "person.name")
Account Person
name: String
1n
96
112
16
40
24
56
72
120
160
128
bytes
am: accountModel A: Account P: Person
Serialization efficiency
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
LambdaModel.of(()->am().getPerson().getName())
model.map(A::getPerson).map(P::getName)
LambdaModel.of(am, A::getPerson).mapP::getNa
PropertyModel.of(am, "person.name")
Account Person
name: String
1n
222
302
662
900
123
1025
1343
1691
2271
1128
bytes
am: accountModel A: Account P: Person
new Account()
Model.of(account)
IModel.of(Account::new)
LoadableDetachableModel.of(Account::new)
class LDM extends LoadableDetachableModel
new IModel<>() { getObject() { return ...} }
LambdaModel.of(()->am().getPerson().getName())
model.map(A::getPerson).map(P::getName)
LambdaModel.of(am, A::getPerson).mapP::getNa
PropertyModel.of(am, "person.name")
Account Person
name: String
1n
222
302
662
900
123
1025
1343
1691
2271
1128
bytes
am: accountModel A: Account P: Person
Component Performance
MarkupContainer finding a child
Which performs better?
container.stream()	
				.filter(c->"id".equals(c.getId()))	
				.findFirst()	
				.get()
container	
				.get("id")
for(Component	c	:	container)	
				if("id".equals(c.getId())	
								break;
get for streamchildren
1,000
100,000
100
1 104,453,168 105,431,300 13,050,626
10 26,787,973 18,238,850 7,130,824
23,322,255 1,155,958 1,072,664
24,252,999 125,178 117,638
23,867,853 735 705
Why Java 8 for Wicket 8
Wicket 8 Noteworthy Features
Java 8 Date Time
Java 8 Optional
Java 8 Lambda's
Migration towards Wicket 8
Migration guide
7.x → 8.0.0
In-house framework
• Size: 172k lines of code
• Current Wicket version: 7.5.0
• Compile errors due to 8.0.0-M2: 70
In-house web app #1
• Size: 36k lines of code
• Current Wicket version: 7.5.0
• Compile errors due to 8.0.0-M2: 55

most: bare Link anonymous inner classes didn't inherit
setDefaultModel from IGenericComponent
Deprecations
• IProvider<T> → Supplier<T>
• AbstractReadOnlyModel<T> → IModel<T>
In-house web app #2
• Size: 1M lines of code
• Current Wicket version: 7.5.0
• Compile errors due to 8.0.0-M2: 346

most:

- AjaxFallback made parameter AjaxRequestTarget Optional

- ILinkListener/IChangeListener/* → IRequestListener

Conclusions
• Java 8 & Wicket 8 is GR8
• Almost ready for release
• But, still work to be done
Questions?

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