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Running Spring Boot apps. Suppose we have a simple Spring Boot application that we got from importing the “Rest Service” guide. It implements a simple @RestController and serves some JSON back to the user. In order to run this app, you could select “Run As → Spring Boot App” or create your own launch configuration in the Eclipse IDE. Getting Started with With Spring Boot, Tomcat, and WAR Files. In a previous tutorial, we built a simple RESTful web app using Spring Boot. I’m going to use this as a base and show how to deploy it into a container. You can grab the code for this tutorial on GitHub. To ensure an existing Spring Boot app is container-ready one needs do three things. Live information is scraped from running apps using JMX to connect to Spring Boot Actuator Endpoints. This means that spring-boot-actuator must be added as a dependency to your application and enabled. The easiest way to accomplish this is to add the spring-boot-actuator-starter dependency to your application's pom.xml or build.gradle as.
For an updated version of this article, see Deploy a Spring Boot Application into Tomcat on the Okta developer blog.
Spring Boot makes it easy to create stand-alone Java web applications. However in production environments, a web container often already exists. How do we deploy our apps in these situations and have them run side-by-side with other servlets? In this tutorial, we’ll walk through how to use WAR files to do just that.
Getting Started with With Spring Boot, Tomcat, and WAR Files
![Mac Mac](/uploads/1/3/3/8/133880236/279348745.jpg)
In a previous tutorial, we built a simple RESTful web app using Spring Boot. I’m going to use this as a base and show how to deploy it into a container. You can grab the code for this tutorial on GitHub.
To ensure an existing Spring Boot app is container-ready one needs do three things
– Renaming the embedded Tomcat libraries
– Repackage the output file as a WAR
– Wire the application up as a servlet
– Renaming the embedded Tomcat libraries
– Repackage the output file as a WAR
– Wire the application up as a servlet
Tomcat Libraries
Building a Spring Boot application produces a runnable jar file by default. If your app includes server functionality, then Tomcat will be bundled with it. We need to ensure the Tomcat libraries don’t clash with an existing container (since the container will include the same libraries).
When we do a clean clone of our repo (grab the code on GitHub if you haven’t yet) and do an
mvn clean package
we end up with a target directory containing our runnable jar.2 |
This jar contains Tomcat libraries. To confirm this, we can rename it to
.zip
and look at the lib
directory.You’ll see various .jar files starting with
tomcat-
. Some of these will clash with a running instance of Tomcat. We need to tell Spring Boot to move them.To WAR! AKA: Build Your WAR Files
First, we must tell Spring Boot we want a WAR file as output. This is as easy as adding one line to our pom.xml.
2 |
Now when we build the package with
2 |
we will see a
.war
file inside our target directory:As before we can rename the file to
Syncios app for mac.
.zip
to see what’s inside. Everything is basically the same, just slightly re-ordered. Now lib
is inside of WEB-INF and
demo` (where our project code sits) is in WEB-INF/classes.Syncios app for mac.
Renaming Tomcat
Next, we tell Spring Boot to move our Tomcat libraries out of this folder. In our previous pom.xml we included three dependencies for our project – one for REST, one for data access, and another for the database.
2 |
Maven Run Spring Boot App
This shows you available URLs. To see what people objects are available you can use:
2 |
Or, create new ones with:
2 | $curl-XPOST-H'Content-Type:application/json'-d'{ 'firstName' : 'Karl', 'lastName' : 'Penzhorn' }'localhost:8080/demo/persons |
Note: In my testing I found the deploy on Windows to be somewhat brittle. Sometimes I needed to close and rerun
startup.bat
.Run as a Standalone Application
One last thing – because our Tomcat libraries are still there (just moved) we are able to run this application on it’s own. So
mvn spring-boot:run
still works !2 |
Learn More
Ready to add authentication and user management to your application? Interested in learning more about Spring Boot? We’ve got some other great resources to help you out:
Happy coding!
- Spring Boot Tutorial
- Spring Boot Resources
- Selected Reading
By using Spring Boot application, we can create a war file to deploy into the web server. In this chapter, you are going to learn how to create a WAR file and deploy the Spring Boot application in Tomcat web server.
Spring Boot Servlet Initializer
The traditional way of deployment is making the Spring Boot Application @SpringBootApplication class extend the SpringBootServletInitializer class. Spring Boot Servlet Initializer class file allows you to configure the application when it is launched by using Servlet Container.
The code for Spring Boot Application class file for JAR file deployment is given below −
We need to extend the class SpringBootServletInitializer to support WAR file deployment. The code of Spring Boot Application class file is given below −
Setting Main Class
In Spring Boot, we need to mention the main class that should start in the build file. For this purpose, you can use the following pieces of code −
For Maven, add the start class in pom.xml properties as shown below −
For Gradle, add the main class name in build.gradle as shown below −
Update packaging JAR into WAR
We have to update the packaging JAR into WAR using the following pieces of code −
For Maven, add the packaging as WAR in pom.xml as shown below −
For Gradle, add the application plugin and war plugin in the build.gradle as shown below −
Now, let us write a simple Rest Endpoint to return the string “Hello World from Tomcat”. To write a Rest Endpoint, we need to add the Spring Boot web starter dependency into our build file.
For Maven, add the Spring Boot starter dependency in pom.xml using the code as shown below −
For Gradle, add the Spring Boot starter dependency in build.gradle using the code as shown below −
Now, write a simple Rest Endpoint in Spring Boot Application class file using the code as shown below −
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Packaging your Application
Now, create a WAR file to deploy into the Tomcat server by using Maven and Gradle commands for packaging your application as given below −
For Maven, use the command mvn package for packaging your application. Then, the WAR file will be created and you can find it in the target directory as shown in the screenshots given below −
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For Gradle, use the command gradle clean build for packaging your application. Then, your WAR file will be created and you can find it under build/libs directory. Observe the screenshots given here for a better understanding −
Deploy into Tomcat
Now, run the Tomcat Server, and deploy the WAR file under the webapps directory. Observe the screenshots shown here for a better understanding −
After successful deployment, hit the URL in your web browser http://localhost:8080/demo-0.0.1-SNAPSHOT/ and observe that the output will look as shown in the screenshot given below −
The full code for this purpose is given below.
pom.xml
Eclipse Run Spring Boot App
build.gradle
Run Spring Boot App Mac Pro
The code for main Spring Boot application class file is given below −