Search code examples
javaspring-bootgradlejarexecutable-jar

Can't run my jar after upgrading SpringBoot from 2.4.X to 2.6.X

I upgraded my library recently from gradle 5.X to 7.3.1 and upgraded Spring-Boot from 2.4.X to 2.6.X but I'm facing an issues. I was using gradle build to create a jar and execute this jar on my server and that was working fine with Spring-Boot 2.4.X but now with 2.6.X I got some issues:

no main manifest attribute

So I added to my build.gradle

jar {
   manifest {
       attributes "Main-Class": "my.package.MainClass"
   }

   from {
       configurations.compileClasspath.collect { it.isDirectory() ? it : zipTree(it) }
       configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) }
   }
}

And now i'm getting the error

Could not find or load main class my.package.MainClass

If I'm switching back to 2.4.X it's working fine. My jar from :

  • spring-boot 2.4.X -> 90Mo
  • spring-boot 2.6.X -> 500 Ko

So I tried to create a fat jar with shadowJar and got this error

ERROR org.springframework.boot.SpringApplication - Application run failed Dec 21 10:04:09 vps-11602ed1 project[12706]: 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.

If someone got an answer about how to make it works with Spring-boot 2.6.X.

Thanks in advance

Solution

  • I found the problem. When I'm upgrading from springboot 2.4.X to 2.6.X, now gradle build is generating a new jar "plain" with my casual jar. And I renamed my jar to the same name. So instead of using the biggest jar, I was using the smallest. Just added that to my gradle.build:

    jar {
enabled = false
}

    So now, it's not creating the "plain" jar and everything is working fine