Java Dependency Injection with parameters

Question

if I have the two classes below as we could see this is a constructor injection for SomeBean, however the constructor in SomeBean only has the constructor with parameter "String words", so during the dependency injection how do we specify the parameter for the constructor of the dependency?

@Component public class SomeBean { private String words; public SomeBean(String words) { this.words = words; } public String getWords() { return words; } public void setWords(String words) { this.words = words; } public void sayHello(){ System.out.println(this.words); } } @Service public class MapService { private SomeBean someBean; @Autowired public MapService(SomeBean someBean) { this.someBean = someBean; } public MapService() { } public void sayHello(){ this.someBean.sayHello(); } }

You will probably need to use an @Bean method to define your SomeBean object. — chrylis -cautiouslyoptimistic-
– chrylis -cautiouslyoptimistic-, Commented Dec 15, 2020 at 7:35

firoj_mujawar · Accepted Answer · 2020-12-15 08:55:19Z

For Java based configuration:

@Configuration public class SpringAppConfiguration { @Bean public SomeBean someBean() { return new SomeBean("value"); } }

For XML configuration:

<bean id="someBean" class="package.SomeClass"> <constructor-arg index="0" value="some-value"/> </bean>

Check this quick guide: https://www.baeldung.com/constructor-injection-in-spring

VKAAM · Accepted Answer · 2020-12-15 08:46:19Z

You should add a Bean of the SomeBean type to a Spring configuration class.

Example of such class with the required Bean:

@Configuration public class Config { @Bean public SomeBean someBean() { return new SomeBean("words"); } }

Collectives™ on Stack Overflow

Java Dependency Injection with parameters

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related