如何使用Spring Boot制作非可执行库（jar）？

Question

I am working on an application and deploying in cloud foundry. Internally it is having 3 custom dependencies developed by our team.

All 3 dependencies are boot project and have their @Configuration .

• Dependency 1 is to interact with Couchbase. Source of this dependency is boot project.
• Dependency 2 is to interact with FluentD for logging. Source of this dependency is boot project.
• Dependency 3 is to interact with external rest service. Source of this dependency is boot project.
• Dependency 4 is having all these above 3 dependencies and also having few utils classes and constants.

I am using this dependency 4 in multiple web applications which are having WebMVC implementation.

Everything is working fine in my local machine. But when I am pushing this web application on cloud, sometimes libraries getting executed before the web application which is crashing my app intermittently. Good thing app is getting recover in few seconds.

I did below changes in my libraries (jars/dependencies) and tried on cloud. After doing these changes ratio of app crash reduces, but unfortunately it is still crashing sometimes and I am able to see dependencies gets executed before application.

• Added bootRepackage.enabled = false bootRepackage.withJarTask = jar in library's build.gradle
• Took off from library and added in my web application springBoot { mainClass = "com.java.Application" executable = true }
• Took off @SpringBootApplication from libraries(dependencies/jars). It's just in my web application now.

I do not know these are the only steps to make a boot dependency non-executable or I would have to do something else. Please let me know if I am missing something.

Here is the sample off application class of one of my dependency.

import org.springframework.context.annotation.ComponentScan;

  @ComponentScan
  public class LoggingApplication {

  }

Sample of Web application main class.
  @SpringBootApplication
  @EnableWebMvc
  @Import(LoggingApplication.class) 
  public class Application {


    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
  }

Answer 1

You didn't expose stacktrace nor provided any specifics of "crash". So looking into my crystal ball, this sounds like you are doing some work during wiring phase of Spring IoC container. This "work" should be moved into @PostConstruct handlers, so that you are sure it will be executed after Spring Context is fully created and initialized.