Is it possible to run Spring Boot Application without web part but with actuator?
For instance I'd like to process some background operations.
My Application properties
management.server.port=8081
server.shutdown=graceful
spring.lifecycle.timeout-per-shutdown-phase=20s
Dependencies
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
When I run the app it stops and not running in background. Did not found the answer in the documentation.
No it is not possible or at least it will run without any errors but stop right after it get startet. Spring Boot starter web actually run an embedded server (Tomcat, Jetty, Netty ...) wich keep the process up.
Related
I am confused what is the different between these dependencies and which one should I use. Would you explain the differences?
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<!---------------------------------------------------------->
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-oauth2-client</artifactId>
</dependency>
<!---------------------------------------------------------->
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-oauth2-jose</artifactId>
</dependency>
<!---------------------------------------------------------->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
</dependency>
and when to use
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
spring-boot-starter-xxx are with no surprise starters for applications with Spring. It:
pulls most the dependencies you need on a subject
auto-wires many useful beans
enables to define many configuration options from properties (application.properties, application.yaml, command line arguments, environment variables,...)
For OAuth2, there are two starters provided by Spring:
spring-boot-starter-oauth2-resource-server if your app is a resource-server (contains #RestController or #Controller with #ResponseBody)
spring-boot-starter-oauth2-client if your app is a client
#Controller with methods returning a template name
using a REST client like WebClient to consume a web-service secured with OAuth2
I also wrote starters which are thin wrappers arround spring-boot-starter-oauth2-resource-server and enable to replace all of necessary Java configuration with just a few properties. Refer to README and tutorials for more details (and to figure out how much effort and errors it can save)
It is possible for an app to be both a resource-server and a client, in which case you'll need to declare both starters in your dependencies.
You can have a look at the tutorials I already linked if you have doubts on how to configure resource-servers. There are a few whith Spring starters or mine. One is even both a resource-server and a client with Thymeleaf page consuming secured REST resources with WebClient)
You don't need to declare dependencies on spring-boot-starter-security, spring-security-oauth2-client or spring-security-oauth2-jose when using OAuth2 starters as all are transitive dependencies.
spring-security-config is useful for defining Spring #Beans in Java configuration files. You might need it in addition to starters.
Which's the difference between
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
</dependency>
and,
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
I'm developing an spring boot service.
spring-boot-starter-data-mongodb contains configuration classes for Spring Boot. It also includes the spring-data-mongodb library so you would only need to include the start in your boot app:
https://search.maven.org/artifact/org.springframework.boot/spring-boot-starter-data-mongodb/2.0.5.RELEASE/jar
spring-boot-starter-data-mongodb is a spring boot starter pom. For more information on starters:
spring-boot-starters
Dependency management is a critical aspects of any complex project. And doing this manually is less than ideal; the more time you spent on it the less time you have on the other important aspects of the project.
Spring Boot starters were built to address exactly this problem. Starter POMs are a set of convenient dependency descriptors that you can include in your application. You get a one-stop-shop for all the Spring and related technology that you need, without having to hunt through sample code and copy paste loads of dependency descriptors.
ive tried the spring REST tutorial and i also got a simple JSF application (running on glassfish), both projects are maven based and i would like to "combine" them.
Meaning, putting the REST project jar into the JSF project.
Does that make sense?
The JSF page should send a request to the microservice REST project when it starts and display the result.
the REST project uses spring-boot and therefore tomcat.
this pom.xml is supposed to use glassfish instead of tomcat, at least thats what the author tells on a spring blog.
Theres a part in it:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
That says to "exclude" tomcat - which is fine, but how does maven or spring know to use glassfish instead?
Is there maybe a better way to combine these two projects?
I would like to keep the projects seperate because of the dependencys in the pom.xml.
Answer #1 in this question solves the confusion:
Using JSF as view technology of Spring MVC
spring mvc and jsf are rivals.
I'm looking to have my log files available to an admin without needing to ssh to the host.
Hopefully something easy as http://myhost:myport/logs/app.log .
Is there any way to expose an endpoint using Spring Boot that would serve my log files?
Spring Boot Actuator
Add the following dependency to your application:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
And out of the box you'll get a lot of useful endpoints including: /logfile
No additional configuration necessary.
I'm trying to learn Spring boot and I notice there are two options.
spring-boot-starter-web - which according to the docs gives support for full-stack web development, including Tomcat and web-mvc
spring-boot-starter-tomcat
Since #1 supports Tomcat why would one want to use #2?
What are the differences?
Thanks
Since #1 supports Tomcat why would one want to use #2?
spring-boot-starter-web contains spring-boot-starter-tomcat. spring-boot-starter-tomcat could potentially be used on its own if spring mvc isn't needed (contained in spring-boot-starter-web).
Here is the dependency hierarchy of spring-boot-starter-web:
What are the differences?
spring-boot-starter-web contains spring web dependencies (including spring-boot-starter-tomcat):
spring-boot-starter
jackson
spring-core
spring-mvc
spring-boot-starter-tomcat
spring-boot-starter-tomcat contains everything related to an embdedded tomcat server:
core
el
logging
websocket
What if you want to use spring mvc without the embedded tomcat server?
Just exclude it from the dependency:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
Well a simple answer is that not all web applications are SpringMVC applications. For example if you wish to use JaxRS instead perhaps you have client applications that use RestTemplate and you like how they interact it doesn't mean you can't use spring boot or embedded tomcat
Here is an example application that uses spring-boot-starter-tomcat but not spring-boot-starter-web
Simple Jersey application in spring boot using spring-boot-starter-tomcat
https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-jersey
It's also important to remember that tomcat is not the only option for an embedded servlet container in spring boot. It's also easy to get started using jetty. And having spring-boot-starter-tomcat makes it easy to exclude all as one module while if they were all just part of spring-web it would be more work to exclude the tomcat libraries to bring in spring-boot-starter-jersey instead
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
I copied this code from another SO question here.
How to configure Jetty in spring-boot (easily?)