@Lazy annotation (#3809)
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package com.baeldung.lazy;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.Lazy;
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@Lazy
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@Configuration
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@ComponentScan(basePackages = "com.baeldung.lazy")
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public class AppConfig {
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@Lazy
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@Bean
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public Region getRegion(){
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return new Region();
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}
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@Bean
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public Country getCountry(){
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return new Country();
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}
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}
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package com.baeldung.lazy;
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import org.springframework.context.annotation.Lazy;
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import org.springframework.stereotype.Component;
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@Lazy
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@Component
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public class City {
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public City() {
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System.out.println("City bean initialized");
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}
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}
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package com.baeldung.lazy;
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public class Country {
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public Country() {
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System.out.println("Country bean initialized");
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}
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}
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package com.baeldung.lazy;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.annotation.Lazy;
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public class Region {
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@Lazy
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@Autowired
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private City city;
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public Region() {
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System.out.println("Region bean initialized");
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}
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public City getCityInstance() {
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return city;
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}
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}
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package com.baeldung.Lazy;
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import com.baeldung.lazy.AppConfig;
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import com.baeldung.lazy.Country;
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import com.baeldung.lazy.Region;
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import org.junit.Test;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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public class LazyAnnotationUnitTest {
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@Test
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public void givenLazyAnnotation_whenConfigClass_thenLazyAll() {
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// Add @Lazy to AppConfig.class while testing
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AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
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ctx.register(AppConfig.class);
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ctx.refresh();
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ctx.getBean(Region.class);
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ctx.getBean(Country.class);
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}
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@Test
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public void givenLazyAnnotation_whenAutowire_thenLazyBean() {
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AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
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ctx.register(AppConfig.class);
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ctx.refresh();
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Region region = ctx.getBean(Region.class);
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region.getCityInstance();
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}
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@Test
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public void givenLazyAnnotation_whenBeanConfig_thenLazyBean() {
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AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
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ctx.register(AppConfig.class);
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ctx.refresh();
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ctx.getBean(Region.class);
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}
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}
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