Spring WebMvcConfigurer running twice - spring

Question

I've noticed a strange behaviour in my Spring web application:
My WebMvcConfigurer implementation is running twice and I don't know why. I'm very new using Spring.
Here are all my classes I think are part of the problem. All of them are inside the same package br.com.cmabreu.config (ask if you need more information). I'm using 5.0.4.RELEASE:
#EnableWebMvc
#Configuration
public class WebConfig implements WebMvcConfigurer {
}
public class SecurityWebApplicationInitializer
extends AbstractSecurityWebApplicationInitializer {
public SecurityWebApplicationInitializer() {
super( LoginSecurityConfig.class );
}
}
#Configuration
#EnableWebSecurity
#ComponentScan(basePackages = "br.com.cmabreu.*")
public class LoginSecurityConfig extends WebSecurityConfigurerAdapter {
#Autowired
private ComboPooledDataSource dataSource;
public void setDataSource(ComboPooledDataSource dataSource) {
this.dataSource = dataSource;
}
}
public class AppInitializer
extends AbstractAnnotationConfigDispatcherServletInitializer {
}
#Configuration
#EnableTransactionManagement
public class HibernateConfig {
#Bean(name="dataSource")
public ComboPooledDataSource getDataSource() {
ComboPooledDataSource driverManagerDataSource = new ComboPooledDataSource();
...
}
}
The execution order is:
1) SecurityWebApplicationInitializer
2) AppInitializer
3) HibernateConfig
4) WebConfig
5) LoginSecurityConfig
6) WebConfig ( AGAIN )
If I remove #ComponentScan from LoginSecurityConfig then the init sequence throws an error just after AppInitializer because it can't find HibernateConfig:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginSecurityConfig': Unsatisfied dependency expressed through field 'dataSource'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mchange.v2.c3p0.ComboPooledDataSource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:409)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4641)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5105)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:671)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:353)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:493)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mchange.v2.c3p0.ComboPooledDataSource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1509)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
... 45 more

Answer 1

#EnableWebMvc annotation itself imports the Spring MVC configuration from WebMvcConfigurationSupport (with default methods).
You do not need to apply it to the class implementing WebMvcConfigurer (with default methods).