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]
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>${spring.boot.mainclass}</mainClass>
</configuration>
</execution>
</executions>
...
</plugin>
Define single main class via start-class property
<properties>
<start-class>com.may.Application</start-class>
</properties>
Alternatively, define the main class in the spring-boot-maven-plugin
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.may.Application</mainClass>
</configuration>
</plugin>
</plugins>
</build>
Or via profiles
<profiles>
<profile>
<id>profile1</id>
<properties>
<spring.boot.mainclass>com.may.Application1</spring.boot.mainclass>
</properties>
</profile>
<profile>
<id>profile2</id>
<properties>
<spring.boot.mainclass>com.may.Application2</spring.boot.mainclass>
</properties>
</profile>
</profiles>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
<configuration>
<mainClass>${spring.boot.mainclass}</mainClass>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
Sometimes this error is given when you do mvn install without doing mvn clean.