Can we implement a Java library by using Spring Boot?

Question

As guided by the thread\'s name, I would like to create a JAVA library by using Spring Boot. I have found this thread: Creating a library jar using Spring boot. However, that th

Answer 1

When designed in the correct way this should not be a problem at all. But in detail it depends which features you're using. Since Spring supports external library like JPA, Websocket,..

There are two important annotations to develop a library and use it in another project.

The first one is simply @Configuration and the other one is @Import.

Library Project

Put a class in the root package which looks something like this.

@Configuration // allows to import this class
@ComponentScan // Scan for beans and other configuration classes
public class SomeLibrary {
    // no main needed here
}

Other Project using the library

As usually put a class in the root package of your project.

@SpringBootApplication
@Import(SomeLibrary.class) // import the library
public class OtherApplication {
    // just put your standard main in this class
}

It is important to keep in mind, that other things might be necessary depending on what your using in terms of other frameworks. For example if your using spring-data the @EntityScan annotation extends the hibernate scan.