When developing with component-scan of Spring (even by default in Boot), the bean name is automatically assigned, so it is easy for the name to be covered.
SampleSpringBoot
├── SampleSpringBootApplication.java
└── controller
├── fuga
│ └── HelloController.java
└── hoge
└── HelloController.java
In this case, both fuga.HelloController and hoge.HelloController have the bean name ** helloController **, which means that they cannot be started because they are covered.
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [net.sinsengumi.SampleSpringBoot.SampleSpringBootApplication]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'helloController' for bean class [net.sinsengumi.SampleSpringBoot.controller.hoge.HelloController] conflicts with existing, non-compatible bean definition of same name and class [net.sinsengumi.SampleSpringBoot.controller.fuga.HelloController]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:270) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:93) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.4.RELEASE.jar:1.5.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.4.RELEASE.jar:1.5.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.4.RELEASE.jar:1.5.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.4.RELEASE.jar:1.5.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.4.RELEASE.jar:1.5.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.4.RELEASE.jar:1.5.4.RELEASE]
at net.sinsengumi.SampleSpringBoot.SampleSpringBootApplication.main(SampleSpringBootApplication.java:10) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_112]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_112]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_112]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_112]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.4.RELEASE.jar:1.5.4.RELEASE]
Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'helloController' for bean class [net.sinsengumi.SampleSpringBoot.controller.hoge.HelloController] conflicts with existing, non-compatible bean definition of same name and class [net.sinsengumi.SampleSpringBoot.controller.fuga.HelloController]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.checkCandidate(ClassPathBeanDefinitionScanner.java:345) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:283) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:135) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:287) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:198) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
... 18 common frames omitted
If you want to avoid this, you can set the bean name when defining the Component.
// fuga.HelloController
@RestController("fugaHelloController")
// hoge.HelloController
@RestController("hogeHelloController")
However, it's too annoying, so it's a good idea to set it all at once and not to cover it.
This is possible using the ** nameGenerator ** of component-scan.
If you want to ensure that you don't suffer in general, you can think of FQCN. But I don't think that's a problem.
public class FQCNBeanNameGenerator extends AnnotationBeanNameGenerator {
@Override
protected String buildDefaultBeanName(BeanDefinition definition) {
return definition.getBeanClassName();
}
}
@SpringBootApplication
@ComponentScan(nameGenerator = FQCNBeanNameGenerator.class)
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
The bean names will now be net.sinsengumi.SampleSpringBoot.controller.fuga.HelloController and net.sinsengumi.SampleSpringBoot.controller.hoge.HelloController and will not be covered.
Spring wants this behavior to be the default.
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