CODEWITHSUNDEEP
javaspringconstructor-injection
tamir_sagi
tamir_sagi

Reputation: 165

Get bean with specific Arguments to constructor in Spring

assume I have that class

public Student{
 private String name;
 private Address address;

 public Student(String fName, Address address){
  name = fname;
  this.address = address;
}

I defined this class within Spring configuration as 

 <bean name="studentInstance" class="StackOverFlow.Student"/>

now i'd like to use getBean with parameter I will pass to constructor. equal to Student s = new Student(name,address) I know Spring supplies a methond getBean(class_name,parms....) however I dont know how I should config Spring.xml configuration file. I would like to avoid using Setter and getter in order to fill a new bean.

I found lots of example of how to define </constructor-arg> within the xml but each time it was with default values. here I let the user to enter different values for each object. I'd like to use ApplicationContext context = new ClassPathXmlApplicationContext(Spring.xml file path); Student s= (Student)context.getBean("studentInstance",name,address);

I need help with the configuration file only

Thanks in Advance!!

I already checked those links : Link1 Link2 Link3 Link4

~~~~~Edit ~~~~~~~

Solved! constructor-injection is not needed here I just added prototype scope to my bean as shown below.

<bean name="carInstance" class="MainApp.bl.GasStation.Car" scope="prototype"/>

Upvotes: 2

Views: 5425

Answers (1)

John
John

Reputation: 5287

Firstly, such bean must obviously be declared as prototype.

The Prototype scopes a single bean definition to have any number of object instances. If scope is set to prototype, the Spring IoC container creates new bean instance of the object every time a request for that specific bean is made <

Object getBean(String name, Object... args)throws BeansException

Return an instance, which may be shared or independent, of the specified bean. Allows for specifying explicit constructor arguments / factory method arguments, overriding the specified default arguments (if any) in the bean definition.

Refer to following question for configuration:

Spring <constructor-arg> element must specify a ref or value

Note, you will have to wrap primitives into their Wrapper objects to avoid having predefined values when object is created.

Upvotes: 1

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