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BAEL-6718: Setting a Spring Bean to Null (#15242) 

* BAEL-6718: Setting a Spring Bean to Null

* BAEL-6718: Java Nullable Example
This commit is contained in:
Eugene Kovko 2023-11-19 20:27:45 +01:00 committed by GitHub
parent 80da8b957d
commit 3371e4fe53
19 changed files with 310 additions and 0 deletions
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21
spring-di-4/src/main/java/com/baeldung/nullablebean/MainComponent.java Normal file
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package com.baeldung.nullablebean;
import org.springframework.stereotype.Component;
@Component
public class MainComponent {
private SubComponent subComponent;
public MainComponent(final SubComponent subComponent) {
this.subComponent = subComponent;
}
public SubComponent getSubComponent() {
return subComponent;
}
public void setSubComponent(final SubComponent subComponent) {
this.subComponent = subComponent;
}
}

8
spring-di-4/src/main/java/com/baeldung/nullablebean/SubComponent.java Normal file
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package com.baeldung.nullablebean;
import org.springframework.stereotype.Component;
@Component
public class SubComponent {
}

8
spring-di-4/src/main/java/com/baeldung/nullablebean/nonrequired/NonRequiredConfiguration.java Normal file
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package com.baeldung.nullablebean.nonrequired;
import org.springframework.context.annotation.ComponentScan;
@ComponentScan
public class NonRequiredConfiguration {
}

19
spring-di-4/src/main/java/com/baeldung/nullablebean/nonrequired/NonRequiredMainComponent.java Normal file
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package com.baeldung.nullablebean.nonrequired;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class NonRequiredMainComponent {
@Autowired(required = false)
private NonRequiredSubComponent subComponent;
public NonRequiredSubComponent getSubComponent() {
return subComponent;
}
public void setSubComponent(final NonRequiredSubComponent subComponent) {
this.subComponent = subComponent;
}
}

5
spring-di-4/src/main/java/com/baeldung/nullablebean/nonrequired/NonRequiredSubComponent.java Normal file
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package com.baeldung.nullablebean.nonrequired;
public class NonRequiredSubComponent {
}

9
spring-di-4/src/main/java/com/baeldung/nullablebean/nullablejava/NullableJavaConfiguration.java Normal file
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package com.baeldung.nullablebean.nullablejava;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan
public class NullableJavaConfiguration {
}

22
spring-di-4/src/main/java/com/baeldung/nullablebean/nullablejava/NullableMainComponent.java Normal file
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package com.baeldung.nullablebean.nullablejava;
import jakarta.annotation.Nullable;
import org.springframework.stereotype.Component;
@Component
public class NullableMainComponent {
private NullableSubComponent subComponent;
public NullableMainComponent(final @Nullable NullableSubComponent subComponent) {
this.subComponent = subComponent;
}
public NullableSubComponent getSubComponent() {
return subComponent;
}
public void setSubComponent(final NullableSubComponent subComponent) {
this.subComponent = subComponent;
}
}

5
spring-di-4/src/main/java/com/baeldung/nullablebean/nullablejava/NullableSubComponent.java Normal file
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package com.baeldung.nullablebean.nullablejava;
public class NullableSubComponent {
}

20
spring-di-4/src/main/java/com/baeldung/nullablebean/nullablespring/NullableConfiguration.java Normal file
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package com.baeldung.nullablebean.nullablespring;
import com.baeldung.nullablebean.MainComponent;
import com.baeldung.nullablebean.SubComponent;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class NullableConfiguration {
@Bean
public MainComponent mainComponent(SubComponent subComponent) {
return new MainComponent(subComponent);
}
@Bean
public SubComponent subComponent() {
return null;
}
}

21
spring-di-4/src/main/java/com/baeldung/nullablebean/nullablespring/NullableSupplierConfiguration.java Normal file
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package com.baeldung.nullablebean.nullablespring;
import com.baeldung.nullablebean.MainComponent;
import com.baeldung.nullablebean.SubComponent;
import java.util.function.Supplier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class NullableSupplierConfiguration {
@Bean
public MainComponent mainComponent(Supplier<SubComponent> subComponentSupplier) {
return new MainComponent(subComponentSupplier.get());
}
@Bean
public Supplier<SubComponent> subComponentSupplier() {
return () -> null;
}
}

17
spring-di-4/src/main/java/com/baeldung/nullablebean/optionable/OptionableConfiguration.java Normal file
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package com.baeldung.nullablebean.optionable;
import com.baeldung.nullablebean.MainComponent;
import com.baeldung.nullablebean.SubComponent;
import java.util.Optional;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class OptionableConfiguration {
@Bean
public MainComponent mainComponent(Optional<SubComponent> optionalSubComponent) {
return new MainComponent(optionalSubComponent.orElse(null));
}
}

95
spring-di-4/src/test/java/com/baeldung/nullablebean/NullableXMLComponentUnitTest.java Normal file
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package com.baeldung.nullablebean;
import static org.junit.jupiter.api.Assertions.*;
import com.baeldung.nullablebean.nonrequired.NonRequiredConfiguration;
import com.baeldung.nullablebean.nonrequired.NonRequiredMainComponent;
import com.baeldung.nullablebean.nullablejava.NullableJavaConfiguration;
import com.baeldung.nullablebean.nullablejava.NullableMainComponent;
import com.baeldung.nullablebean.nullablespring.NullableConfiguration;
import com.baeldung.nullablebean.nullablespring.NullableSupplierConfiguration;
import com.baeldung.nullablebean.optionable.OptionableConfiguration;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.UnsatisfiedDependencyException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
class NullableXMLComponentUnitTest {
@Test
void givenContextWhenCreatingNullableMainComponentThenSubComponentIsNull() {
final AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
NullableJavaConfiguration.class);
final NullableMainComponent bean = context.getBean(NullableMainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenNonRequiredContextWhenCreatingMainComponentThenSubComponentIsNull() {
final AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
NonRequiredConfiguration.class);
final NonRequiredMainComponent bean = context.getBean(NonRequiredMainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenOptionableContextWhenCreatingMainComponentThenSubComponentIsNull() {
final AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
OptionableConfiguration.class);
final MainComponent bean = context.getBean(MainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenNullableSupplierContextWhenCreatingMainComponentThenSubComponentIsNull() {
final AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
NullableSupplierConfiguration.class);
final MainComponent bean = context.getBean(MainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenNullableContextWhenCreatingMainComponentThenSubComponentIsNull() {
assertThrows(UnsatisfiedDependencyException.class, () -> new AnnotationConfigApplicationContext(
NullableConfiguration.class));
}
@Test
void givenNullableXMLContextWhenCreatingMainComponentThenSubComponentIsNull() {
final ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"nullable-application-context.xml");
final MainComponent bean = context.getBean(MainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenNullableSpELXMLContextWhenCreatingMainComponentThenSubComponentIsNull() {
final ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"nullable-spel-application-context.xml");
final MainComponent bean = context.getBean(MainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenNullableSpELXMLContextWithNullablePropertiesWhenCreatingMainComponentThenSubComponentIsNull() {
final ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"nullable-configurable-spel-application-context.xml");
final MainComponent bean = context.getBean(MainComponent.class);
assertNull(bean.getSubComponent());
}
@Test
void givenNullableSpELXMLContextWithNonNullablePropertiesWhenCreatingMainComponentThenSubComponentIsNull() {
final ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"non-nullable-configurable-spel-application-context.xml");
final MainComponent bean = context.getBean(MainComponent.class);
assertNotNull(bean.getSubComponent());
}
@Test
void givenXMLContextWhenCreatingMainComponentThenSubComponentNotNull() {
final ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
"non-nullable-application-context.xml");
final MainComponent bean = context.getBean(MainComponent.class);
assertNotNull(bean.getSubComponent());
}
}

10
spring-di-4/src/test/resources/non-nullable-application-context.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean class="com.baeldung.nullablebean.MainComponent" name="mainComponent">
<constructor-arg ref="subComponent"/>
</bean>
<bean class="com.baeldung.nullablebean.SubComponent" name="subComponent"/>
</beans>

14
spring-di-4/src/test/resources/non-nullable-configurable-spel-application-context.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:non-nullable.properties"/>
</bean>
<bean class="com.baeldung.nullablebean.MainComponent" name="mainComponent">
<constructor-arg value="#{ ${nullableBean} }"/>
</bean>
<bean class="com.baeldung.nullablebean.SubComponent" name="subComponent"/>
</beans>

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spring-di-4/src/test/resources/non-nullable.properties Normal file
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nullableBean = subComponent

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spring-di-4/src/test/resources/nullable-application-context.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean class="com.baeldung.nullablebean.MainComponent" name="mainComponent">
<constructor-arg>
<null/>
</constructor-arg>
</bean>
</beans>

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spring-di-4/src/test/resources/nullable-configurable-spel-application-context.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:nullable.properties"/>
</bean>
<bean class="com.baeldung.nullablebean.MainComponent" name="mainComponent">
<constructor-arg value="#{ ${nullableBean} }"/>
</bean>
<bean class="com.baeldung.nullablebean.SubComponent" name="subComponent"/>
</beans>

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spring-di-4/src/test/resources/nullable-spel-application-context.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean class="com.baeldung.nullablebean.MainComponent" name="mainComponent">
<constructor-arg value="#{null}"/>
</bean>
</beans>

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spring-di-4/src/test/resources/nullable.properties Normal file
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nullableBean = null