SpringBoot no main manifest attribute (maven)
When running my jar file: java -jar target/places-1.0-SNAPSHOT.jar
I'm getting the next error :
no main manifest attribute, in target/places-1.0-SNAPSHOT.jar
The pom.xml
contains the spring-boot-maven-plugin
:
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.places.Main</mainClass>
</configuration>
</plugin>
I also tried to create a MANIFEST.MF
file and specifying the class, but it didnt help.
In addition, I also tried:
<properties>
<!-- The main class to start by executing "java -jar" -->
<start-class>com.places.Main</start-class>
</properties>
Main class:
@SpringBootApplication
public class Main {
public static void main(String[] args) throws InterruptedException {
SpringApplication.run(Main.class,args);
}
}
Any idea what else can I try?
Try adding repackage
goal to execution goals.
Otherwise you would need to call the plugin explicitly as mvn package spring-boot:repackage
.
With the goal added, you have to call only mvn package
.
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.places.Main</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
During the Maven package
lifecycle phase, the jar archive is enhanced by Spring Boot Maven Plugin and the original jar file (that should have been built using the standard maven-jar-plugin) is replaced with an enhanced executable jar.
Hence you have either to issue the spring-boot:repackage
goal yourself when building your module:
mvn package spring-boot:repackage
Or add the goal
explicitly within the plugin configuration:
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.places.Main</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
You can find more details about the Spring Boot Maven Plugin repackage
goal within the official documentation.
3 things:
- You have the parent entry in your pom.
- Verify that your plugin is in the build portion of the pom.
- You have a class with the @SpringBootApplicaion annotation.
pom.xml:
...
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.8.RELEASE</version>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
...
And a class that looks something like this:
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
You can specify a parent POM e.g. :
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
</parent>
During the package goal, the repackage goal will be executed and you'll then get an executable jar.
added build tag in pom.xml as below solved issue for me.
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>