Trouble when changing Spring Boot version from 2.0.3.RELEASE to 2.1.0.BUILD-SNAPSHOT - spring-boot

Question

I have a working code that stops to work when I change Spring Boot version from 2.0.3.RELEASE to 2.1.0.BUILD-SNAPSHOT.
Sometimes the error is:
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
***************************
APPLICATION FAILED TO START
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Description:
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.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
or ...
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-07-16 14:38:18.509 ERROR 604 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
The bean 'scopedTarget.oauth2ClientContext', defined in class path resource [org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2RestOperationsConfiguration$SessionScopedConfiguration$ClientContextConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/security/oauth2/config/annotation/web/configuration/OAuth2ClientConfiguration$OAuth2ClientContextConfiguration.class] and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
Both cases it is related to duplicated bean os something else.
My POM dependencies are:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version>
<maven.test.skip>true</maven.test.skip>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-oauth2</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
and the config:
server:
error:
include-stacktrace: always
whitelabel:
enabled: false
servlet:
session:
cookie:
name: HYDRASSESSION
port: 36205
management:
endpoints:
web:
exposure:
include: "*"
security:
basic:
enabled: false
oauth2:
client:
clientId: atlas
clientSecret: secret
accessTokenUri: http://myserverip:36202/oauth/token
userAuthorizationUri: http://myserverip:36202/oauth/authorize
resource:
userInfoUri: http://myserverip:36202/user/me
spring:
jpa:
properties:
hibernate:
temp:
use_jdbc_metadata_defaults: false
hibernate:
ddl-auto: validate
application:
name: atlas
datasource:
password: admin
username: postgres
url: jdbc:postgresql://myserverip:36211/atlas?ApplicationName=Atlas
guardiao:
logout:
path: http://myserverip:36202/exit
It run fine when using 2.0.3.RELEASE but I'm receiving an error when try to login myserver:36202/oauth/authorize?client_id=: by browser complains ERR_TOO_MANY_REDIRECTS but I have no errors in console. Anyway... my question is: how can I update my SpringBoot to 2.1.0.BUILD-SNAPSHOT ?

Answer 1

So as the exception reports, there are two beans of the same type. Historically Spring would override one bean with the other. That has long been an annoyance since you could get hard to find bugs where a second bean with a completely different type, but with the same bean ID would make your first bean vanish.
Spring Boot 2 now disables that sort of bean overriding by default. You can re-enable it by setting the following property in your application.yml:
spring.main.allow-bean-definition-overriding: true
This re-enables the previous behavior. It doesn't address the root cause that beans are being overridden though and also mean you won't get the benefit of bean override errors. Upgrading the underlying libraries will hopefully clean this up over time.
As noted on other comments, upgrading the spring-security-oauth2-autoconfigure dependency to org.springframework.security.oauth.boot:spring-security-oauth2-autoconfigure:2.1.0.RELEASE may solve it for you.

Answer 2

This answer might be helpful for those who have setup a new project and adding the spring.main.allow-bean-definition-overriding: true property in application.properties file is not fixing the issue:
Check the folder where your application.properties file is present -- it needs to be available directly under the directory: src/main/resources/ and not anywhere else.