[Bugfix] Dubbo Spring Boot 2.7.0 Environment Beans conflict in Spring Boot or Spring Cloud 2

[mercyblitz]

If your Spring Boot/Cloud 2 application met with this issue , like below:

***************************
APPLICATION FAILED TO START
***************************

Description:

Field env in org.springframework.cloud.netflix.archaius.ArchaiusAutoConfiguration$PropagateEventsConfiguration required a single bean, but 2 were found:
	- dubboScanBasePackagesPropertyResolver: defined by method 'dubboScanBasePackagesPropertyResolver' in class path resource [org/apache/dubbo/spring/boot/autoconfigure/DubboRelaxedBinding2AutoConfiguration.class]
	- environment: a programmatically registered singleton

Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

Please add these code for your application to resolve this issue:

• Add "spring.main.allow-bean-definition-overriding" into application.properties

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

• Re-define the bean named dubboScanBasePackagesPropertyResolver:

    // Bugfix code  to resolve Environment Beans conflict 
    @Primary
    @Bean(name = BASE_PACKAGES_PROPERTY_RESOLVER_BEAN_NAME)
    public PropertyResolver dubboScanBasePackagesPropertyResolver(ConfigurableEnvironment environment) {
        ConfigurableEnvironment propertyResolver = new AbstractEnvironment() {
            protected void customizePropertySources(MutablePropertySources propertySources) {
                Map<String, Object> dubboScanProperties = PropertySourcesUtils.getSubProperties(environment, DUBBO_SCAN_PREFIX);
                propertySources.addLast(new MapPropertySource("dubboScanProperties", dubboScanProperties));
            }
        };
        ConfigurationPropertySources.attach(propertyResolver);
        return new DelegatingPropertyResolver(propertyResolver);
    }


    private static class DelegatingPropertyResolver implements PropertyResolver {

        private final PropertyResolver delegate;

        DelegatingPropertyResolver(PropertyResolver delegate) {
            Assert.notNull(delegate, "The delegate of PropertyResolver must not be null");
            this.delegate = delegate;
        }

        @Override
        public boolean containsProperty(String key) {
            return delegate.containsProperty(key);
        }

        @Override
        @Nullable
        public String getProperty(String key) {
            return delegate.getProperty(key);
        }

        @Override
        public String getProperty(String key, String defaultValue) {
            return delegate.getProperty(key, defaultValue);
        }

        @Override
        @Nullable
        public <T> T getProperty(String key, Class<T> targetType) {
            return delegate.getProperty(key, targetType);
        }

        @Override
        public <T> T getProperty(String key, Class<T> targetType, T defaultValue) {
            return delegate.getProperty(key, targetType, defaultValue);
        }

        @Override
        public String getRequiredProperty(String key) throws IllegalStateException {
            return delegate.getRequiredProperty(key);
        }

        @Override
        public <T> T getRequiredProperty(String key, Class<T> targetType) throws IllegalStateException {
            return delegate.getRequiredProperty(key, targetType);
        }

        @Override
        public String resolvePlaceholders(String text) {
            return delegate.resolvePlaceholders(text);
        }

        @Override
        public String resolveRequiredPlaceholders(String text) throws IllegalArgumentException {
            return delegate.resolveRequiredPlaceholders(text);
        }
    }

[mercyblitz]

The related issues : #449

[G-little]

最新 springboot dubbo 整合 https://github.com/G-little/priest

[chinasteel]

someone shoud add bellow operation

1. config to application.properties
   spring.autoconfigure.exclude=org.apache.dubbo.spring.boot.autoconfigure.DubboRelaxedBinding2AutoConfiguration
2. copy DubboRelaxedBinding2AutoConfiguration and referance to local project and add @primary
   to dubboScanBasePackagesPropertyResolver method