BAEL-6532: Define main class when using multiple profiles in a Spring Boot project (#14267)

Co-authored-by: Tapan Avasthi <tavasthi@Tapans-MacBook-Air.local>

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/SpringBootFiltersApplication.java

@@ -2,13 +2,15 @@ package com.baeldung.bootcustomfilters;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Profile;
 
 /**
  * Boot application
  * @author hemant
  *
  */
-@SpringBootApplication
+@Profile("filter")
+@SpringBootApplication(scanBasePackages = "com.baeldung.bootcustomfilters.*")
 public class SpringBootFiltersApplication {
 
 	public static void main(String[] args) {

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/changeport/CustomApplication.java

@@ -4,8 +4,10 @@ import java.util.Collections;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Profile;
 
-@SpringBootApplication
+@Profile("customapplication")
+@SpringBootApplication(scanBasePackages = "com.baeldung.changeport")
 public class CustomApplication {
 
     public static void main(String[] args) {

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/errorhandling/ErrorHandlingApplication.java

@@ -2,7 +2,9 @@ package com.baeldung.errorhandling;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Profile;
 
+@Profile("errorhandling")
 @SpringBootApplication(scanBasePackages = "com.baeldung.errorhandling")
 public class ErrorHandlingApplication {
 

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/FailureAnalyzerApplication.java

@@ -2,10 +2,12 @@ package com.baeldung.failureanalyzer;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Profile;
 
 import javax.annotation.security.RolesAllowed;
 
-@SpringBootApplication
+@Profile("failureanalyzer")
+@SpringBootApplication(scanBasePackages = "com.baeldung.failureanalyzer")
 public class FailureAnalyzerApplication {
     @RolesAllowed("*")
     public static void main(String[] args) {

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/favicon/FaviconApplication.java

@@ -2,8 +2,10 @@ package com.baeldung.favicon;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Profile;
 
-@SpringBootApplication
+@Profile("favicon")
+@SpringBootApplication(scanBasePackages = "com.baeldung.favicon")
 public class FaviconApplication {
 
     public static void main(String[] args) {

spring-boot-modules/spring-boot-basic-customization/src/test/java/com/baeldung/failureanalyzer/FailureAnalyzerAppIntegrationTest.java

@@ -1,13 +1,16 @@
 package com.baeldung.failureanalyzer;
 
 import ch.qos.logback.classic.spi.ILoggingEvent;
+
 import com.baeldung.failureanalyzer.utils.ListAppender;
+
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.boot.SpringApplication;
 
 import java.util.Collection;
+import java.util.Properties;
 import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -27,7 +30,11 @@ public class FailureAnalyzerAppIntegrationTest {
     @Test
     public void givenBeanCreationErrorInContext_whenContextLoaded_thenFailureAnalyzerLogsReport() {
         try {
-            SpringApplication.run(FailureAnalyzerApplication.class);
+            Properties properties = new Properties();
+            properties.setProperty("spring.profiles.active", "failureanalyzer");
+            SpringApplication app = new SpringApplication(FailureAnalyzerApplication.class);
+            app.setDefaultProperties(properties);
+            app.run();
         } catch (BeanCreationException e) {
             Collection<String> allLoggedEntries = ListAppender.getEvents()
                 .stream()