DataSource bean overriding in spring boot 2.1

Mariusz Miesiak :

I have upgraded to spring boot 2.1 release and I have got strange exception when starting up the application.

The bean 'dataSource', defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class] and overriding is disabled.

The full error message is:

[o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext] Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.support.BeanDefinitionOverrideException: Invalid bean definition with name 'dataSource' defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Cannot register bean definition [Root bean: class [org.springframework.aop.scope.ScopedProxyFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null; defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]] for bean 'dataSource': There is already [Root bean: class [null]; scope=refresh; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=false; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari; factoryMethodName=dataSource; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]] bound.

Beans must not be overridden according to our policy and it's disabled with:

spring.main.allow-bean-definition-overriding=false

I don't have any data source configuration in my application code. The only option that triggers this error is @EnableAutoConfiguration and in my application properties I have set the data source type to:

spring.datasource.type=com.zaxxer.hikari.HikariDataSource

The boot application is initialized with

@SpringBootApplication
@EnableAutoConfiguration
public class MyApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        new MyApplication()
            .configure(new SpringApplicationBuilder(MyApplication.class))
            .run(args);
    }
}

There is also configuration class that imports various other configurations:

@Configuration
@ImportResource(locations = {
    "classpath*:conf/spring/*.xml",
    "classpath*:conf/spring/core/*.xml",
    "classpath*:conf/spring/plugin/**/*.xml"
})
@EnableAsync
@EnableRetry
@EnableCaching
@EnableBatchProcessing
@EnableCircuitBreaker
public class AppConfig {
    ...
}

Does anyone knows what could cause that issue and where to search?

It didn't happened prior to Spring Boot 2.1 (i.e. 2.0.5).

Brad Fontaine :

I ran into a similar problem with this today and the following spring cloud config issue helped me: Issue 1142.

We were using Spring Cloud Config which is not compatible with Spring Boot 2.1.0 as of yet. The Greenwich release train of Spring Cloud will be compatible with Spring Boot 2.1.0.

Your @EnableCircuitBreaker annotation leads me to believe you might also be using a version of Spring Cloud that is not compatible with the 2.1.0 release of Spring Boot.

DataSource bean overriding in spring boot 2.1

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