I want to make a spring boot product base application.
In that I want to make a different spring application depends on each other by adding reference of one application to another application.
And make seperate jars of each and put it into tomcat
I would like to suggest you to start with simple hello-world application and later you can scale your application up.
Simple way is go to 'start.spring.io', add dependencies like spring boot starter web.
You can download the project after adding dependencies. Now, just import the project in your eclipse as 'import existing maven project'.
Spring boot has inbuilt tomcat, simply right click on the import project and select
run as --> java application
Your application will start on port 8080.
Now, you can create one more similar application and can run the application on port 8081 by adding a property server.port=8081 in your 2nd application.
You can call the api of 1st application from 2nd application.
If you are planning to create microservices, then please read about spring cloud.
Related
For example,
I understand adding specific dependencies like spring-boot-starter-web that contains tomcat as transitive dependency triggers the spring framework to initialize tomcat container but I want to know if we say a spring-boot application is running, does it imply always that tomcat is also running?
I want to know if we say a spring-boot application is running, does it imply always that tomcat is also running?
No, it doesn't.
Spring boot can be used for both web applications and non-web applications.
For web applications you can use tomcat/jetty/undertow/netty for example, its up to you to chose what works for you the best.
If you don't want to run an embedded version of the web server you can opt for creating a WAR file and place it into the web server prepared in-advance.
If you don't want to run web application at all (something that is built around "Request - Response" way of work in the most broad sense) - you can create a "CommandLineRunner" - in this case you don't need to depend on neither web-mvc nor webflux. For more information about Command Line Runners read here for example
You can have an embedded server in your JAR that is able to be run on its own. By default it is Tomcat but you can change this to others, like Jetty. Additional details:
https://docs.spring.io/spring-boot/docs/2.0.6.RELEASE/reference/html/howto-embedded-web-servers.html
If you don't want to have an embedded server and you want to deploy your application you can also create WAR files instead of JAR files. Additional details:
https://www.baeldung.com/spring-boot-no-web-server
https://spring.io/guides/gs/convert-jar-to-war/
I have a use case where I need to run atleast two or more spring boot applications on the same port.
I am able to run spring boot applications via mvn spring-boot:run -Pdev... port and other information. I have provided following configuration in spring boot projects
server.port= 8597
server.contextPath=<as per the project>
spring.config.name=<project name>
With this configuration, I successfully run two spring boot application on same port i.e. 8587.
Now, here the problem comes, when I package the project as jar for dist purposes and run the application as java -jar <profile>..... second boot project run fails with Address already in use.
I am not able to understand where I am going wrong. I even tried passing context, port and config name in vm arguments but no success.
Any help?
I know spring boot applications can be deployed to production environments as war files. But what is the typical way of deploying spring boot applications? Does it only require a jvm, not a container?
The Spring Boot Project Page states that Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can "just run".
Means by default, the Spring Boot maven or gradle plugin builds self-contained executable jars, that contain all dependencies and an embedded webserver, e.g. tomcat or jetty. The Spring Boot Getting Started doc gives you an introduction to that. Using this approach you just need a JVM to run your application. But you can also configure it to create war files if this is a better fit to your production environment.
Does it only require a jvm, not a container?
It can run anywhere Java is setup.
Spring Boot's use of embedded containers and why Spring chose to go the container-less route. Many of their main driving forces were ease of use while testing and debugging, and being able to deploy Spring-based Java applications to the cloud, or any other environment.
Rest can be found out in attached image.
Spring boot applications if they are serving web requests do require a container. You can either deploy them as a war inside a container such as tomcat/jetty. Or you can deploy them with embedded container, tomcat.
I would like to evolve my Spring application with a better architecture. The technologies I'm using are : spring portfolio ( spring mvc, spring test, spring Web, spring core, spring rest...)
Today I'm using packaging to structure the different layers of my application: models, services, api and of course web where I have my controllers.
I would like to know how can I use the power of spring boot to make a multi module maven architecture with an xml spring configuration for a Web application. I read that spring boot have an embedded tomcat and since I'm using eclipse with a separate tomcat server I would like to deploy my application on it and I think that this can create a problem.
I already found some links on github with this type of projects most of them are not elaboring an architecture of a Web application and use a class for spring configuration with the embedded tomcat that spring boot offers.
Thank you
Ps: sorry for my bad English
What you mean by multi module. If you want to build your jar for multiple environment you can use maven profile for it. Spring boot is nothing but a spring project which ease the configurations for you.
Regarding deployment to your own server, you have to convert the jar to war. Read "What about the Java EE Application Server" section of below link.
https://spring.io/blog/2014/03/07/deploying-spring-boot-applications
I have created an application as spring boot application,Now i want to integrate this application with wily,where i ll passed wily parameter in application to configure application.
The fact that it's a Spring Boot application shouldn't make any difference. If you're using an executable jar file, you'll need to configure the agent when you launch the jar, for example:
java -jar my-app.jar -javaagent:<Agent_Home>/Agent.jar -Dcom.wily.introscope.agentProfile=<Path_To_Agent_Profile>
If you're deploying your Spring Boot application as a war file to a servlet container or application server, you'll need to be make the equivalent configuration changes. The documentation describes how to configure Tomcat.