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Java 9 Dependency Injection
book

Java 9 Dependency Injection

by Nilang Patel, Krunal Patel
April 2018
Intermediate to advanced content levelIntermediate to advanced
246 pages
6h 11m
English
Packt Publishing
Content preview from Java 9 Dependency Injection

Auto-wiring by type

In this mode, Spring does binding of beans based on type. Here, the type means the class attribute of <bean>Spring looks for the bean with the same type as the property that needs to be autowired. In other words, dependencies are auto bound with the bean having the same type.

If more than one bean of the same type exists, Spring shows exception. If Spring doesn't find the bean with a matching type, nothing happens; simply, the property will not be set. Let's understand this by looking at the following example:

public class EmailService {  public void sendEmail() {    System.out.println(" Sending Email ..!! ");  }}public class HRService {  private EmailService emailService = null;  //Setter DI method. public void setEmailService(EmailService ...
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Publisher Resources

ISBN: 9781788296250Supplemental Content