SpringBoot: Unable to find a single main class from the following candidates

问题:

I've generated a Spring Boot web application using Spring Initializer, embedded Tomcat, Thymeleaf template engine.Technologies used: Spring Boot 1.4.2.RELEASE, Spring 4.3.4.RELEASE, Thymeleaf 2.1.5.RELEASE, Tomcat Embed 8.5.6, Maven 3, Java 8

I have an SpringBoot app. with these 2 classes:

@Profile("!war") @SpringBootApplication @Import({SecurityConfig.class ,PersistenceConfig.class, ServiceConfig.class}) public class BookApplication {      public static void main(String[] args) {         SpringApplication.run(BookApplication.class, args);     } }  @Profile("war") @Import({SecurityConfig.class ,PersistenceConfig.class}) @SpringBootApplication public class BookApplicationWar extends SpringBootServletInitializer {      @Override     protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {         return application.sources(BookApplicationWar.class);     }      public static void main(String[] args) throws Exception {         SpringApplication.run(BookApplicationWar.class, args);     }  } 

I generate the war with this command

 mvn clean package -DskipTests -Dspring.profiles.active=pebloc,war -DAPP-KEY=pebloc 

But I got this error:

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) on project book: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.tdk.BookApplication, com.tdk.BookApplicationWar] -> [Help 1] 

回答1:

If you have more than one main class, you need to explicitly configure the main class in each profile:

<profiles>     <profile>         <id>profile1</id>         <properties>           <spring.boot.mainclass>com.SomeClass</spring.boot.mainclass>         </properties>     </profile>     <profile>         <id>profile2</id>         <properties>           <spring.boot.mainclass>com.SomeOtherClass</spring.boot.mainclass>         </properties>     </profile> </profiles> 

...

<plugin>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-maven-plugin</artifactId>     <version>1.5.2.RELEASE</version>     <executions>       <execution>         <goals>           <goal>repackage</goal>         </goals>         <configuration>           <mainClass>${spring.boot.mainclass}</mainClass>         </configuration>       </execution>     </executions>     ... </plugin> 

See spring-boot:repackage

回答2:

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) on project book: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.tdk.BookApplication, com.tdk.BookApplicationWar]  

One possible reason to getting following error is more than one main methods in your code, Spring boot allow only one main method across all class in same project.

文章来源: SpringBoot: Unable to find a single main class from the following candidates