Is there a way to expose my Spring applicationContext via a servlet or webapp so that I can manipulate and inspect the beans in the appcontext.
You may want to have a look at the Spring Inspector a plug-gable component that provides programmatic access to any Spring based application at run-time. You can use Javascript to change configurations or manage the application behavior at run-time.
Not aware of a special tool/plug-in. Maybe this would do:
How can I determine Objects in application context?
Spring Insight might do the trick.
Related
Per the Spring Documentation, application context is:
Central interface to provide configuration for an application. This is read-only while the application is running, but maybe reloaded if the implementation supports this.
In some applications, there are multiple application contexts. What's the purpose and benefit of having multiple application contexts? I want to understand the logic behind it. Why would one do it?
P.S: In spring doc use is written. I want to know the pros of having multiple application contexts and the rationale behind it.
The root context is the parent of every dispatcher servlet context/child context. Beans defined in root context are visible to each dispatcher servlet context/child context but not vice-versa.
Typically, root context is used to define all cross-cutting beans such as security, transactions, and other configurational beans, while the dispatcher context or child context contains those beans that are specifically related to MVC.
We create multiple dispatcher servlets when we need multiple sets of MVC configuration. For e.g. we may have a REST API alongside a traditional MVC application or an unsecured and a secure section of a website.
Cannot comment so putting the answer:-
Java Spring multiple ApplicationContext
Hope this answer your question
It is useful to implement a layered architecture (model objects, data access, services, web services, mvc app etc).
As M.Deinum said it is good to have one root context that loads the others and helps keeping them separated.
Here is the official doc for the architecture of Spring Framework applications: https://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/overview.html
I have examples of both working individually, now trying to merge so that I have both capabilities / entry points.
Not surpised it is confused about the application contexts to load.
I want to know if this is even possible and if so any examples?
I know it is doable with spring boot however not wanting to move to that just yet.
I am attempting the impossible?
"Spring MVC (with embedded Jetty)" usually means an HTTP endpoint running in its own JVM (I suppose you have a main method that starts Jetty). Once you have that started, you can integrate it as any other HTTP endpoint in Spring Integration.
If you want them both to run in the same JVM, that probably means you don't want to make use of HTTP as you can invoke methods directly on your #Controllers or #Services.
Or perhaps I'm missing something here... ?
I'd go for Spring Boot. Version 1.1.6 was just released. I'm currently also migrating an "old" SI application to be based upon Spring Boot. I suggest you give http://start.spring.io a try. Migration should not be too difficult.
Is it possible to inject a bean from a web application that deploy in another server!
I declare a scenario to myself, I have two web application that use spring framework and deploy separately in different application servers (one is TOMCAT and another one is WEBLOGIC),the first application has ServiceA and the second one has ServiceB, now I want to inject ServiceB in ServieA?
I try to do this with RMI once an another one with JMS, now I am wondering that:
Is it possible with another thing?
Is there any active project about this scenario exist?
How can share application context in spring framework, is it possible?
Thanks.
Bean is just an object in JVM. You certainly cannot use an object from one JVM in another JVM straightforward.
But you can do 2 things:
Use proxies - some objects that will have the same interface but invoke somehow to the proper server as implementation.
Use service-oriented architecture (SOA). Each server should have some limited set of beans that are responsible for their functionality. And all beans can interact with each other.
Maybe OSGI is suitable for this.
Web services, JAX-RS is the simplest. But JAX-WS provides you with the tools to automatically generate the client code.
We have an application context inside a web application. Whenever a typed-bean is requested which is not available in the context we have to create it and add it to the context.
The context will basically have to react to a NoSuchBeanDefinitionException by using a factory to create it.
For those wondering why we don't create them beforehand or use a FactoryBeans: Due to the highly dynamic nature of how the legacy middleware and the other layers interact we don't have a chance to know the service-types beforehand.
Any suggestions?
As mentioned in the comment below: Registering beans(prototype) at runtime in Spring
I am using Spring to manage my DAO & Services. And JSF for UI. I want to use dependency injection in my JSF backing-bean. There is an article that explained how I can do that.
But I have two separate projects: one for Service and one for UI. The Spring configuration file is located in Service project.
How can I connect both project with Spring? I want to annotate my JSF pages for DI.
You can achieve this by using Spring Web Flow.
Spring have examples which show:
A JSF centric approach where your Spring and JSF beans are managed/configured the JSF way (faces-config) and a
Spring centric approach where your beans (including ManagedBeans) are managed in the Spring Context.
See Spring Flow Web Home
If you mean that you have one WAR with web services defined in it, and another separate WAR with the JSF stuff, I think it's really two separate projects each with their own Spring configuration.
The web service WAR will use either Spring web services or perhaps HTTP remoting to expose your service interfaces to clients via HTTP. This will have one set of application context configuration, either XML or annotations.
The JSF WAR will have the JSPs and controllers. The controllers will be injected with clients that will interact with the remote services to accomplish what you wish. That's all they need to know about the service WAR. There doesn't need to be any duplication of configuration at all.
It's actually a nice design, because it completely decouples the view from the rest of the problem.
Thank for everyone I did it. My mistake was with bean initialization. I tried to access my injected bean in constructor, but must must did in #PostConstruct method. And all that time i tried to find mistake in my config file. But it was in such simply place :)
I find some solution one:
Sample Application using JSF, Spring 2.5, and Java Persistence APIs with Glassfish v2
. But I have problem with it.
I can post this problem hear or must create new topic? Sorry for stupid question, i'm newbie her.