Spring Boot compatibility issues when upgrading to new libraries - spring

Question

I am in the process of upgrading a Spring Boot application to support Micrometer and Actuator monitoring. I have upgraded the Spring libraries to newer versions, and I have refactored the code accordingly (you can see before and after code samples later in in this question). I could run the application successfully before; when I try to do so now, I am getting the following error message:
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-08-20 14:14:59.302 ERROR 29703 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:163) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:143) [spring-boot-2.5.3.jar:2.5.3]
at com.openbet.realitycheck.Application.main(Application.java:22) [classes/:na]
Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:210) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:160) ~[spring-boot-2.5.3.jar:2.5.3]
... 7 common frames omitted
The below screenshot describes the library versions that were previously used:
enter image description here
These are the upgraded libraries that I am using now:
enter image description here
Some before-and-after code samples:
Before:
#SpringApplicationConfiguration(classes = {Application.class, IntegrationTestConfiguration.class})
#WebIntegrationTest("server.port=0")
After:
#SpringBootTest(classes = {Application.class, IntegrationTestConfiguration.class}, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
Before:
#SpringApplicationConfiguration(classes = UnitTestConfiguration.class)
After:
#SpringBootTest(classes = UnitTestConfiguration.class)
Here is my starter class:
#SpringBootApplication
public class Application {
public static void main(String[] args) {
// Change the default config name to xxxxxxxxxxxx.
new SpringApplicationBuilder(Application.class)
.properties(Collections.singletonMap("spring.config.name", "xxxxxxxxxxxx"))
.run(args);
}
}
When I specify that this is not a Web Application...
#SpringBootApplication
public class Application {
public static void main(String[] args) {
// Change the default config name to xxxxxxxxxxxx.
new SpringApplicationBuilder(Application.class)
.web(WebApplicationType.NONE)
.properties(Collections.singletonMap("spring.config.name", "xxxxxxxxxxxx"))
.run(args);
}
}
...I receive a different set of error messages:
***************************
APPLICATION FAILED TO START
***************************
Description:
Field customerPrefRepository in com.corpname.appname.core.services.CustomerPrefServiceImpl required a bean of type 'com.corpname.appname.core.repositories.CustomerPrefRepository' that could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'com.corpname.appname.core.repositories.CustomerPrefRepository' in your configuration.
As this is a web-based application, I don't know of how much use this last bit for information would be.