Spring Boot Questions-part 1

• What is Spring Boot?

Spring Boot makes it easy to create stand-alone, Production-grade Spring based applications so you can "just run".
You can use the Spring Boot to create Java applications the can be started using Java-jar or more traditional war deployment S.

• What is the advantages of spring boot application?

Provide a range of non-functional features that is common to large classes of projects (e.g. embedded servers, security, Metrics, health checks, externalized configuration).
Opinionated view of the Spring platform and third-party libraries so you can get started with minimum fuss.
Absolutely no code generation and no requirement for XML configuration.
Provide a radically faster and widely accessible getting started experience for all Spring development.

• What is the Requirements of Spring boot System?

Spring Boot 1.5.9.RELEASE requires
Java 7 +
Spring 4.3.13 +

For build support
Maven 3.2+
Gradle 2.9+

Container Support
Tomcat 7+
Jetty 8+ (Jetty 9.3 requires JDK 8 +)

Read more Spring Boot system requirements

• What is the use of @EnableAutoConfiguration annotation?

This annotation tells Spring Boot to "guess" what you'll want to configure Spring, based on the jar dependencies that's you Have added.

Read more @enableautoconfiguration Spring Boot example

• What is Spring Boot Starter?

Spring Boot provides a number of "starters" that do easy-to-manage dependencies for your project.

Read More Spring Boot starter

• What is Spring-boot-starter-parent?

The spring-boot-starter-parent is a special starter this makes Maven or Gradle dependency-management easier by adding jars to your classpath.

Read more Spring-boot-starter-parent

• What is Spring-boot-starter-web?

This starter would add Tomcat and Spring MVC dependency to our application and its default configuration.

Read more Spring-boot-starter-web

• How to create an executable jar using spring boot?

Add this below plugin to Pom.xml

<build>    <plugins>        <plugin>            <groupid>org.springframework.boot</groupid >            <artifactId>spring-boot-maven-plugin</artifactId>        </plugin>    </plugins ></build>

Use MVN clean package to create executable jar file

Read more Spring boot executable jar example

• How does the run and stop spring boot executable jar?

Open cmd or shell window and use Java-jar as shown below

$ Java-jar Myproject-0.0.1-snapshot.jar

To stop use CTRL + C

Read more run Spring boot jar from command line

• How does the change JDK version in spring boot?

Java 1.6 As the default compiler level.
You can overwrite it by adding Java.version property tag as shown below

<properties>    <java.version>1.8</java.version></properties>

• How to disable specific auto-configuration in spring boot?

You can use Exclude property as shown below to disable specific auto configuration

@EnableAutoConfiguration (Exclude={datasourceautoconfiguration.class})

• What is the @SpringBootApplication annotation?

The @SpringBootApplication annotation is equivalent to using @Configuration, @EnableAutoConfiguration and @ComponentScan With their default attributes

Since Many spring Boot developers has their main class annotated with @Configuration, @EnableAutoConfiguration and @Compo Nentscan, Spring boot provides you a new annotation @SpringBootApplication as replacement.

Spring Boot Questions-part 1