I would like to use the Spring Initializr to create WAR for tomcat...
Our DevOps are still not used to the idea of running java as a standalone and would like to have the application as a WAR in tomcat
I was able to produce a project but it seems like its producing a standalone spring boot application
I still want to use Spring Initializr to produce all the dependencies like :
Rest Repositories
JDBC template
Quartz
REST
One solution is to create a dynamic web project in eclipse and use Spring Initializr then just copy all the pom dependency into the dynamic web project
is there a better way?
To build a deployable war file into an external container, you have to :
Reconfigure your project to produce a WAR
Declare the embedded container ( Tomcat ) dependency as provided
<packaging>war</packaging>
<dependencies>
...
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
...
</dependencies>
Related
I am working on a Spring project with many different folder structures inside it. I want to run one of the Spring module folder (project) on my local machine (want to create a local web container through Spring Boot dependency) without tomcat server.
I don't have Tomcat installed in my VMWare. So I have to add Spring Boot dependencies in pom.xml file. What should I do? Which dependencies should I add to run my project in local server?
No need of separate Tomcat installation. Spring Boot comes with embedded Tomcat. You can have parent and web dependency in your pom.xml:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
Spring boot project, build and package a jar file then upload it to the server, run it:
java -jar xxx.jar
How can I make it auto reload when I upload a new jar file?
add Spring Boot DevTools to your dependencies for developer friendly options like auto restart of the server:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
If we run sprin-boot:run in linux
where will be the tomcat running path.
what will the folder structure of tomcat for jar and war.
will there be any work or webApps folder created?
How to find the tomcat path in linux,will it be running as separate tomcat service or the java application service.
suppose any hot fix deployment with jsp change, which was possible if there is a webapps, is it possible with spring boot?
You deploy Spring Boot as an executable JAR and run it using java -jar. It's the main class that is executed.
Tomcat or Jetty is the HTTP listener; it's running inside Spring Boot. It's the reverse of creating a WAR and deploying it to Tomcat.
There's no work or web apps folder created.
Embedded Servers in Spring boot
The idea of Embedded Server is to make the server part of the application,so in this case to be able to deploy directly to the virtual machine,you only need to have virtual machine with java already installed.
for using embedded service using tomcat you will need to have this conf in pom.xml:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<version>2.0.0.RELEASE</version>
<scope>compile</scope>
</dependency>
starter-tomcat itself also has these dependecies :
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>8.5.23</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-el</artifactId>
<version>8.5.23</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-websocket</artifactId>
<version>8.5.23</version>
<scope>compile</scope>
</dependency>
Which are the tomcat dependency enough to run your application as a single jar on it's own.
Summary
in spring boot when we create an application deployable, we would embed the server inside the deployable (for example tomcat). this means, you can generate an application jar which contains Embedded Tomcat. You can run a web application as a normal Java application.as a result, When you execute mvn spring:boot run it's exactly equivalent as executing java -jar command but maven also make sure about some suble considrations:
your application are given the right parameters
making sure your application already compiled
More Info
https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-web-servers.html
I am considering modifying an existing java web app (with web.xml and applicationContext.xml files and Spring 2.5) to use Spring Boot. What are the implications of this process? I know I will need to create an #Configuration file to declare all of the beans (to eliminate the applicationContext.xml files), but would love some additional insight. Any suggestions are appreciated!
Migration would take several steps. Some of them are:-
Add Spring Boot dependencies to your pom.xml or gradle file.
Define all the XML beans using Java Configuration by #Bean
Define Spring Security if used through Java Configuration
Add application.properties to resources directory and defines all the configuration values like database host,username,password etc
Define your views inside resources/templates
You've to include all the dependencies required. Some of the dependencies are:-
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- Test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
You could have some other dependencies too like Spring Security. If your application uses Spring Security you have to provide java configuration for it.
http://www.baeldung.com/spring-boot-security-autoconfiguration
https://spring.io/blog/2014/01/30/migrating-from-spring-framework-3-2-to-4-0-1
I downloaded from github http://websystique.com/spring-boot/spring-boot-angularjs-spring-data-jpa-crud-app-example/ and import as maven and I cannot add this app to tomcat.
If i changed packaging from jar to war, I can add, but get 404 on localhost:8080/SpringBootCRUDApp
How can i run this app?
You do not need to add it to tomcat. Spring Boot uses a public static void main entry-point that launches an embedded web server for you. So just run main method.
In Your Application, you already added Springboot-starter-web Dependency in pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
And packaged your application as "jar" as below in pom.xml
<packaging>jar</packaging>
"spring -boot-starter-web" dependency has inbuilt embedded Tomcat container, so you don't need to add anything in Tomcat container
You can run your application with below command in cmd
java -jar SpringBootCRUDApplicationExample.jar
<!-- marked the embedded servlet container as provided -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
use this example for your reference.