generating a working war file with maven for a spring-boot web application

Question

We have a maven-managed spring-boot application that we now need to deploy in tomcat using a WAR file. During development, we used maven to start an embedded tomcat with the command:

mvn -D"-classpath %classpath package.path.App" -D"exec.executable=java" process-classes org.codehaus.mojo:exec-maven-plugin:1.2.1:exec

I can build a war file by running mvn war:war, but if I try to deploy the resulting war, an error is produced:

SEVERE: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext ... Caused by: java.lang.IllegalStateException: No SpringApplication sources have been defined. Either override the configure method or add an @Configuration annotation

I tried adding a mainClass directive to the maven-war-plugin's configuration, but to no avail.

Do you use Eclipse to develop the project? If so, try right click on the project -> Export. — Dino Tw
– Dino Tw, Commented Mar 5, 2015 at 17:28
Have you configured a SpringBootServletInitializer with your @SpringApplication annotated class to boot up your application? — dunni
– dunni, Commented Mar 5, 2015 at 17:41
@dunni I have no @SpringApplication class (I did not even find such an annotation in any spring documentation), I have a class with a main(args) function that does SpringApplication app = new SpringApplication(App.class); and app.run(args);. For the maven embedded tomcat, I do have a class extending SpringBootServletInitializer, but did not need to declare it anywhere. I will look into this. — P.Péter
– P.Péter, Commented Mar 6, 2015 at 9:01

P.Péter · Accepted Answer · 2016-03-16 08:38:17Z

I managed to build a war following dunni's advice.

Basically, I needed to add a @SpringBootApplication annotation on the class extending SpringBootServletInitializer, and override its configure method.

So the diff of my code is like:

+@SpringBootApplication public class WebAppInitializer extends SpringBootServletInitializer { + @Override + protected SpringApplicationBuilder configure(SpringApplicationBuilder application) { + return application.sources(App.class); + }

I still have an error but only after spring starts, but I will ask about that in a different question.

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