I am working on a spring boot application.
I wanted to know what happens when the application started running and before it becomes ready for user interaction.
I tried going through the console logs but I am still unsure as to what happens when.
I believe you should elaborate a bit more your question. That's because you can build different types of applications using Spring Boot. In a nutshell, during the start up the application will basically try to load the "beans" defined in the related context(s), pre-configured components, define the active profile, properties files, etc. Also some Spring and application events are generated during the start up.
A good way to understand what's going on behind the scenes is running the application in DEBUG mode. By default, the log level of the application is set as INFO.
Have a look at this link for further details:
http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-spring-application
I hope this can help you as start point.
Related
I have an Eclipse RCP(E4) application, which I can start without any problem. Now I decide to connect it to my Spring-Boot embedded Tomcat-server. The Spring-Boot-container runs an H2 as an in memory DB. Running Spring-Boot as "Java Application", I access the data in the DB via a rest-service over the browser.
The problem is, I actually want to embed the Spring-Boot part in my RCP-application. So once I start the application it will start my embedded Sring-Boot tomcat and I can run my CRUD-operations directly from the RCP-UI.
Has anyone got experience dealing with Eclipse-RCP running with Spring-Boot?
P.S: I chose explicitly to not put any code hier, because I don't have any code problem yet. The applications run separately well. I just haven't no clue how to relate them.
Just looking for some information if others have solved this pattern. I want to use Spring Integration and Spring Batch together. Both of these are SpringBoot applications and ideally I'd like to keep them and their respective configuration separated, so they are both their own executable jar. I'm having problems executing them in their own process space and I believe I want, unless someone can convince me otherwise, each to run like they are their own Spring Boot app and initialize themselves with their own profiles and properties. What I'm having trouble with though is the invocation of the job in my SpringBatch project from my SpringIntegration project. At first I couldn't get the properties loaded from the batch project, so I realized I need to pass the spring.active.profiles as a Job Parameter and that seemed to solve that. But there are other things in the Spring Boot Batch application that aren't loading correctly like the schema-platform.sql file and the database isn't getting initialized, etc.
On this initial launch of the job I might want the response to go back to Spring Integration for some messaging on Job Status. There might be times when I want to run a job without Spring Integration kicking off the job, but still take advantage of sending statuses back to the Spring Integration project providing its listening on a channel or something.
I've reviewed quite a few Spring samples and have yet to find my exact scenario, most are with the two dependencies in the same project, so maybe I'm doing something that's not possible, but I'm sure I'm just missing a little something in the Spring configuration.
My questions/issues are:
I don't want the Spring Integration project to know anything about the SpringBatch configuration other than the job its kicking off. I have found a good way to do that reference to the Job Bean without getting my entire batch configuration loading.
Should I keep these two projects separated or would it be better to combine them since I have two-way communication between both.
How should the Job be launch from the integration project. We're using the spring-batch-integration project with JobLaunchRequest and JobLauncher. This seems to run it in the same process as the Spring Integration project and I'm missing a lot of my SpringBootBatch projects initialization
Should I be using a CommandLineRunner instead to force it to another process.
Is SpringApplication.run(BatchConfiguration.class) the answer?
Looking for some general project configuration setup to meet these requirements.
Spring Cloud Data Flow in combination with Spring Cloud Task does exactly what you're asking. It launches Spring Cloud Task applications (which can contain batch jobs) as new processes on the platform you choose. I'd encourage you to check out that project here: http://cloud.spring.io/spring-cloud-dataflow/
I am having a question regarding Spring ROO. Although this is not a good question to ask still as i am facing some issue.
I have created Spring ROO application using below link in Eclipse
http://docs.spring.io/spring-roo/reference/html/beginning.html
After putting some efforts i was able to see the application output as desired then a doubt came to mind that how i will print value from browser to Controller i.e. client to server side (System.out.println("")).
I have tried many solution but nothing seems to be working. So can some one tell me how will i do it.
Just to summarize the thing i want value from textfield etc in my .java file using above Spring ROO project.
Spring Roo just creates a Spring Web MVC application.
In your question I found that you need some architectural concepts about Spring Web MVC and Web applications that you must know to start developing application.
Try to read some tutorials and post (this looks good) before start to develop your application.
Good luck!
Chema.
I want to deploy an application with a web interface. I want to use Spring YARN for this because that eases all the basic setup, and I can start the application with java -jar.
What steps do I have to do to:
have my application expose a web interface
have the tracking URI I get when submitting it proxy to that web interface
Unfortunately, I cannot find anything about this on the net, there is npthing on that particular issue in the Spring documentation and Google searches do not get me the correct results either.
Easiest way to do this is simply use Spring YARN Boot application model and framework is then trying to do the heavy lifting on your behalf. I actually showed a demo of this during my session at SpringOne 2GX 2014. You can find my session recording from youtube https://www.youtube.com/watch?v=qlvX7_r9aUA.
Interesting stuff for this particular feature is at the end (starting from 1:16:22) and you can see how web server address is registered into YARN resource manager and how I query it using a Spring YARN Boot CLI (around 1:32:13). Spring YARN will actually see that there is an embedded servlet context and registers it automatically. In this demo property "server.port=0" makes tomcat to choose random port which is then registered.
Code for this particular UI demo can be found from github https://github.com/SpringOne2GX-2014/JanneValkealahti-SpringYarn/tree/master/gs-yarn-rabbit. Demo was around RabbitMQ just to have some real UI functionality and not just a dummy hello world page.
There's also more up-to-date sample in https://github.com/spring-projects/spring-hadoop-samples/tree/master/boot/yarn-store-groups which doesn't have a real UI(just Boot management endpoints). Thought it's relatively easy to add Spring MVC magic there just by following normal Boot functionality(i.e. following https://spring.io/guides/gs/rest-service).
Lemmy know if this helps!
I've been looking for someone else doing this same thing, but haven't seen a scenario that's quite like this so I thought I'd see if anyone here has any good ideas on how to accomplish this.
My group builds and maintains an open-source neuroimaging data archive tool called XNAT. Previous versions of our application have always required users to run a builder application that took in a build.properties file and used that to initialize the database server configuration, among other things. We're really trying to get down to a single installable war file that we can make available on the NeuroDebian repository. In order to do this, we need to be able to start the application WITHOUT any database configuration information, run through a configuration wizard a la Wordpress or Drupal installations that includes the user inputting the database configuration, and finally setting this configuration information SOMEWHERE and re-starting or re-initializing the application context so that it gets its data source started up, Hibernate entity scans run, all auto-wired or injected dependencies that require the data source or Hibernate transaction manager resolved, and services scanned for #Transactional annotations, and so on.
I can easily see how we can use the new Spring Framework WebApplicationInitializer to detect whether the user has already set up the database configuration and initialize the app properly based on that:
If database has not been configured, create an servlet that just supports the UI for the initialization wizard
If database has been configured, create the regular application context
The problem in the first case is what happens once the user has completed the initialization wizard? We can store the database configuration somewhere and now we're ready to go but... how do we get the regular application context working? Can we just take the code that we'd call in the already initialized scenario and call that? Will that initialize the application properly then, with component scans and so on all being handled or...?
The only solution we have currently is to have the user restart the server manually (it's usually Tomcat) or use the server manager application to restart just our application. That's not very aesthetically pleasing though.
My end goal here will be to write a simple test app that takes in the database credentials and then tries to initialize everything else afterwards, but I'm hoping to see if anyone's thought about this particular issue and/or tried it and has any advice on how to handle it. Any help would be greatly appreciated!