Spring get current ApplicationContext

Question

I am using Spring MVC for my web application  My beans are written in  spring-servlet xml  file  Now I have a class MyClass and i want to access this class using spring bean  In the spring-servlet xml i have written following   lt bean id  myClass  class  com lynas MyClass    gt    Now i need to access this using ApplicationContext   ApplicationContext context        So that I can do   MyClass myClass    MyClass  context getBean  myClass      How to do this

User · Answer

ApplicationContext applicationContext   new ClassPathXmlApplicationContext   spring-servlet xml      Then you can retrieve the bean   MyClass myClass    MyClass  context getBean  myClass      Reference  springbyexample org

User · Answer

Another way is to inject applicationContext through servlet   This is an example of how to inject dependencies when using Spring web services    lt servlet gt           lt servlet-name gt my-soap-ws lt  servlet-name gt           lt servlet-class gt org springframework ws transport http MessageDispatcherServlet lt  servlet-class gt           lt init-param gt               lt param-name gt transformWsdlLocations lt  param-name gt               lt param-value gt false lt  param-value gt           lt  init-param gt           lt init-param gt               lt param-name gt contextConfigLocation lt  param-name gt               lt param-value gt classpath my-applicationContext xml lt  param-value gt           lt  init-param gt           lt load-on-startup gt 5 lt  load-on-startup gt    lt  servlet gt    Alternate way is to add application Context in your web xml  as shown below   lt context-param gt       lt param-name gt contextConfigLocation lt  param-name gt       lt param-value gt           WEB-INF classes my-another-applicationContext xml         classpath my-second-context xml      lt  param-value gt   lt  context-param gt    Basically you are trying to tell servlet that it should look for beans defined in these context files

User · Answer

If you re implementing a class that s not instantiated by Spring  like a JsonDeserializer you can use   WebApplicationContext context   ContextLoader getCurrentWebApplicationContext    MyClass myBean   context getBean MyClass class

User · Answer

Add this to your code   Autowired private ApplicationContext  applicationContext     Add below line in your calling method MyClass class    MyClass   applicationContext getBean  myClass        Or you can simply use this  put the below code in your controller data member declaration part   Autowired private MyClass myClass    This will simply inject myClass into your application

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Even after adding  Autowire if your class is not a RestController or Configuration Class  the applicationContext object was coming as null  Tried Creating new class with below and it is working fine   Component public class SpringContext implements ApplicationContextAware      private static ApplicationContext applicationContext       Override     public void setApplicationContext ApplicationContext applicationContext  throws       BeansException       this applicationContext applicationContext           you can then implement a getter method in the same class as per your need like getting the Implemented class reference by      applicationContext getBean String serviceName Interface Class

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In case you need to access the context from within a HttpServlet which itself is not instantiated by Spring  and therefore neither  Autowire nor ApplicationContextAware will work      WebApplicationContext applicationContext   WebApplicationContextUtils getWebApplicationContext getServletContext       or  SpringBeanAutowiringSupport processInjectionBasedOnCurrentContext this       As for some of the other replies  think twice before you do this   new ClassPathXmlApplicationContext            are you sure       as this does not give you the current context  rather it creates another instance of it for you  Which means 1  significant chunk of memory and 2  beans are not shared among these two application contexts

User · Answer

Even better than having it with  Autowired is to let it be injected via constructor  Find some arguments pro constructor injection here  Component public class MyClass    private final ApplicationContext applicationContext     public MyClass ApplicationContext applicationContext       this applicationContext   applicationContext           here will be your methods using the applicationcontext

User · Answer

There are many way to get application context in Spring application  Those are given bellow    Via ApplicationContextAware   import org springframework beans BeansException  import org springframework context ApplicationContext  import org springframework context ApplicationContextAware   public class AppContextProvider implements ApplicationContextAware    private ApplicationContext applicationContext    Override public void setApplicationContext ApplicationContext applicationContext  throws BeansException       this applicationContext   applicationContext         Here setApplicationContext ApplicationContext applicationContext  method you will get the applicationContext   Via Autowired    Autowired private ApplicationContext applicationContext     Here  Autowired keyword will provide the applicationContext    For more info visit this thread  Thanks

User · Answer

Simply inject it     Autowired private ApplicationContext appContext    or implement this interface  ApplicationContextAware

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I think this link demonstrates the best way to get application context anywhere  even in the non-bean class  I find it very useful  Hope its the same for you  The below is the abstract code of it  Create a new class ApplicationContextProvider java  package com java2novice spring   import org springframework beans BeansException  import org springframework context ApplicationContext  import org springframework context ApplicationContextAware   public class ApplicationContextProvider implements ApplicationContextAware       private static ApplicationContext context       public static ApplicationContext getApplicationContext             return context              Override     public void setApplicationContext ApplicationContext ac              throws BeansException           context   ac            Add an entry in application-context xml   lt bean id  applicationContextProvider                          class  com java2novice spring ApplicationContextProvider   gt    In annotations case  instead of application-context xml    Component public class ApplicationContextProvider implements ApplicationContextAware          Get the context like this  TestBean tb   ApplicationContextProvider getApplicationContext   getBean  testBean   TestBean class     Cheers

User · Answer

Step 1  Inject following code in class   Autowired private ApplicationContext  applicationContext    Step 2   Write Getter  amp  Setter   Step 3  define autowire  byType  in xml file in which bean is defined

User · Answer

based on Vivek s answer  but I think the following would be better    Component  applicationContextProvider   public class ApplicationContextProvider implements ApplicationContextAware        private static class AplicationContextHolder           private static final InnerContextResource CONTEXT PROV   new InnerContextResource             private AplicationContextHolder                 super                         private static final class InnerContextResource            private ApplicationContext context           private InnerContextResource                super                       private void setContext ApplicationContext context               this context   context                       public static ApplicationContext getApplicationContext             return AplicationContextHolder CONTEXT PROV context              Override     public void setApplicationContext ApplicationContext ac            AplicationContextHolder CONTEXT PROV setContext ac             Writing from an instance method to a static field is a bad practice and dangerous if multiple instances are being manipulated

[java] Spring get current ApplicationContext

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