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Spring Basics

An introduction to the basic concepts of the Java Spring Framework.

QuestionAnswer
An application framework implements the standard ____________ of an application for a specific development environment. structure
In frameworks, _____________ help to assemble components from different projects into a cohesive application. containers
Frameworks often play the role of the main program in coordinating and sequencing application activity ("don't call us; we'll call you"); this characteristic is referred to as _______________. inversion of control
A framework is essentially a ____________, a structure around which the fleshing-out of an application occurs. skeleton
An ___________ is a group of method declarations with empty bodies, whose behavior is implemented in a separate class. interface
The pattern of __________ relies on the concept of an "assembler" that instantiates the objects required by an application and “injects” them into their dependent objects. dependency injection
Types of Dependency Injection: In __________, the constructor arguments are injected during instance instantiation. constructor injection
Types of Dependency Injection: In _________, dependencies are "set" in the objects through setter methods defined in a Spring configuration file. setter injection
Types of Dependency Injection: In ___________, (not currently implemented in Spring), items are mapped to inject to specific interfaces. interface injection
Spring uses the concept of a ___________ as its assembler, which manages the JavaBeans the developer has configured to run within it. BeanFactory
In Spring, the initialization of a bean by the framework is exactly equivalent to using the ______ keyword to instantiate an object in Java code. new
Coding to __________ is part of good object-oriented practice. interfaces
In Spring, bean configuration is accomplished by ___________. XML mapping
The core module of the Spring framework is its __________ container. inversion of control
The inversion of control container manages Java objects from instantiation to destruction through its _________ (assembler). BeanFactory
Java components that are instantiated by the inversion of control container are called _______. beans
Setter injection uses the ______ methods in a class file to garner property names that are configurable in the XML configuration file. set
The implementation of the inversion of control container that should be used when building an application is _______________. ApplicationContext
The __________ is a subclass of the BeanFactory interface, so it has all the functionality a BeanFactory has and more. ApplicationContext
A popular implementation of ApplicationContext, which defaults to reading resources from the classpath, is ____________. ClassPathXmlApplicationContext
A __________ is a parameter that tells the Java Virtual Machine or the Java compiler where to look for user-defined classes and packages. classpath
The key benefit of dependency injection is that it removes the dependency that a given class has on a particular _____________. implementation
Dependency injection simplifies object-oriented programming by promoting ____________ between classes. loose coupling
Spring's core model of dependency injection lets the developer define which __________ are created and what their ___________ are. beans; properties
A major module of Spring, __________, refers to the ability to add side effects to a class's method calls without modifying the class's source code. aspect-oriented programming
The basic philosophy of Spring is to avoid __________ among classes. tight coupling
The Spring framework is composed of several well-defined ___________ built on top of the core __________, making it possible to use as much or as little of the Spring framework as is needed in a particular application. modules; container
Objects whose implementations are likely to change are defined in the _________ file. bean definition
In the bean definition file, the _________ tag is used to define an object's name and class. bean
In the bean definition file, the _________ tag is used to assign values to the object (setter injection). property
In the bean definition file, the ________ tag is used to assign values to the object (constructor injection). constructor-arg
The following code creates a new __________ based on a bean definition file: ApplicationContext context = new ClassPathXmlApplicationContext("/bean-file.xml") container
The following code gets _____________ from the container: (InterfaceType)context.getBean("bean-name") object instances
Spring is useful when you have objects whose ____________ change often, and you supply _____________ values through constructors or setter methods. implementations; initialization
Bean initialization values can be other beans instead of concrete values; supplying these values in a definition file to be passed at runtime is known as _____________. dependency injection
Basic Spring Applications, Step #1: Define an ___________ or __________ with no dependencies on Spring. interface; abstract class
Basic Spring Applications, Step #2: Make concrete ______________ of the _____________. implementations; interface
Basic Spring Applications, Step #3: Declare concrete __________ in ______________ file. object; bean definition
Basic Spring Applications, Step #4: Instantiate _____________ from _____________ file. container; bean definition
Basic Spring Applications, Step #5: Get __________ instances. bean
When you declare a bean (and don't use constructor-arg), the _______________ is called when the object is instantiated. zero-argument constructor
The bean definition file refers to a "bean property", which is a shortcut for a ________ method name. setter
The bean property name is determined by dropping ______ from the setter method name, then changing the next letter to __________. set; lowercase
The property and constructor-arg tags have an attribute, ________, which refers to a bean declared elsewhere. ref
bean tags can be __________ to supply a new bean as a value to a setter method or constructor. nested
list tags can be nested inside property or constructor-arg tags to pass a ________ to a setter method or constructor. list
map tags can be nested inside property or constructor-arg tags to pass a ________ to a setter method or constructor. map
Instantiating the ________________ container is expensive and should be done once only. ApplicationContext
Instead of calling the zero-argument constructor and then calling setter methods, you can supply ___________ arguments. constructor
Use ___________ only for immutable classes that have no setter methods. Use _________ otherwise. constructor-arg; property
One issue with constructor arguments is that Spring does not always pass arguments in the _________ that they are listed. order
One issue with constructor arguments is that Spring does type conversion, so arguments that are _____________ with the constructor definition could still be accepted. mismatched
Setter injection is often preferred over constructor injection because constructor-arg is prone to ___________. ambiguity
If there are multiple constructor arguments with compatible types, the _________ attribute can be used to specify which argument is which (e.g. <constructor-arg value="5" index="0"/>). index
If there are multiple constructors with same number of arguments, both _________ and __________ attributes can be used (e.g. constructor-arg value="5" index="0" type="int"). index; type
If you don't know what type of bean you will need, you can call a ___________ method. factory
The misnamed _____________ can be used to supply values to the factory method. constructor-arg
In order to avoid dependencies, the main class should never call ______ on a particular subclass. Instead, the bean definition file should create the objects that the main class depends on and inject them into the main class via _________ or ___________. new; property; constructor-arg
Spring allows Collections to be injected; it is possible to pass a __________ or __________ of beans. list; map
To use an existing bean as a property in a bean definition, use the _______ tag (the same applies to using an existing bean as a constructor-arg). ref
To pass a list to a bean, nest the _______ tags inside the property tags, and use the ________ tag to contain the existing bean name. list; ref local
To pass a map to a bean, nest the _______ tags inside the property tags, and use the ________ tag to contain the existing bean name. map; entry key
If you do not define _________, every time you call getBean() on the same name, you get the same instance. scope
The property and constructor-arg tags are only invoked the first time a bean is called; e.g., if a bean of that name has not already been ____________. instantiated
To get a new instance of a bean every time it is called, use the attribute/value __________ within the bean definition. scope = "prototype"
Beans in web applications can have various scopes in addition to default and prototype, including __________ and ___________. request; session
Created by: erikaacarlson