Generally, we downloaded the TOMCAT to the computer and configure the context where it stores the project path then run the TOMCAT. So we can access our web project.
Is there a possibility that we can start the TOMCAT by just using java code.
like
Tomcat tomcat = new Tomcat(configuration);
tomcat.run();
Can not understand what are you trying to achieve? But, Spring Boot comes with embedded tomcat and your application is deployed automatically on tomcat (with default configurations). If you want to change configurations for the tomcat you can specify those configurations in application.properties.
Like, e-g if you want to change port of your server you can specify following property in application.properties.
server.port = 8085
There are other server related properties for which you can refer to https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html.
You can also implement WebServerFactoryCustomizer
in order to configure tomcat with java. For this purpose you can refer to https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-web-servers.html
Related
Generally, I specify Tomcat properties in the application.properties file of my Spring Boot application. Is there any way to change some of those properties (which can be changed) dynamically, in the runtime? May be, by hitting an endpoint?
If not, is there any other way to make them dynamic from within the application code (and not the properties file)?
There are some libraries that can be configured both from the application.properties and dynamically as well (using endpoints). Does Tomcat provide any such mechanism?
Yes, there is. You can configure and hit endpoints to reconfigure:
https://cloud.spring.io/spring-cloud-config/reference/html/
My project has a bootstrap.yaml and a config server that deliver its appropriate profile. Everything is working great but I have to accomplish some others task like CI and CD.
My problem comes because the Jenkins machine is not allowed to resolved external domains and try to compile and run the Spring boot app without an a profile.
So my question is:
Is there a way to load application.properties when the config server
is not resolved?
Yes, there is a natural way based on the order in which Spring Boot loads PropertySources.
You can include properties you want to be applied in application.properties.
In case config server is not available - properties from application.properties will be used. If config server is available - you'll receive properties from there.
You might also want to disable config server connectivity for your CI using environment variable SPRING_CLOUD_CONFIG_ENABLED=false.
I've been using an embedded neo4j server in my project so far.
Now I want to try out the new bolt protocol with a standalone server, however only for my deployed application. For convenience, I still want to use an embedded database when running from IDE (permanent) or when running tests (impermanent).
In order to support this, I've migrated from the java based configuration to the use of a ogm.properties file. Depending on the environment I run in, I want to use the file which configures the respective driver/database location.
I have placed a default configuration in the root of my resources folder. However I am not able to "override" this in other environment.
In order to do that I placed a different ogm.properties in the root folder of the deployed application. This doesn't seem to work. This the mechanism that I previously already used in order to have different application.properties and logback.xml configurations.
Is this not supported by neo4j-ogm? If not, how can one achieve this? It also isn't (trivially) possible with the java based configuration.
I am a bit confused, since this doesn't sound like such an unlikely requirement...
You can use Spring Profile for this to configure different properties for different environments and you can look here.
You can use application.properties (spring.profiles.active) to load a different profile or by using a runtime argument if you are using Spring boot with CommandLineRunner.
I write a spring boot application (which is configured throw a Spring Cloud Config Server).
This application has a small UI for information only. However, it should be possible to start this application multiple times so you can not set a fix port for this application (in the Config Server).
For this it is possible to set a random port (server.port=0) and you can start as many instances of this application as you want. A little issue is that if the user wants to access the UI he has to find out a “random port”.
So my question is: Is it somehow possible to define a preferred Port (using Config Server) and only if this port is not available take a random port?
You can just configure it via command line system property java -Dserver.port=$PORT -jar app.jar. Example is in this section of Spring Boot docs.
I bet also setting up environment variable SERVER_PORT may work.
I think also Spring Boot parameter should work: java -jar app.jar --server.port=$PORT
When using JAAS JDBCRealms with Tomcat, I usually define the realm in server.xml. But now I am looking for a simpler solution, where I don't have to configure the Tomcat container when deploying the application.
If possible, I would like to keep all the JAAS configuration in web.xml and just define the realm per application/webapp.
One thread mentions that he did this by defining the realm in META-INF/context.xml of the webapp.. but I could not get it working (Why is Tomcat manager using my LoginModule?).
Please help me find the correct location in the .war to define a org.apache.catalina.realm.JDBCRealm that is then used for that webapp.
To define your own JDBCRealm, create a META-INF/context.xml in your own web application.
Configure your JDBCRealm according to the specification based on your Tomcat Server versions:
Tomcat 5.5
Tomcat 6.0
Tomcat 7.0
These links shows you exactly how to configure JDBCRealm.