Add Bean Programmatically to Spring Web App Context

Question

Because of a plug-in architecture  I m trying to add a bean programmatically to my webapp   I have a Spring bean created through the  Component annotation  and i am implementing the ApplicationContextAware interface   My override function looks like this    Override public void setApplicationContext ApplicationContext applicationContext          throws BeansException           this fails     this applicationContext    GenericWebApplicationContext  applicationContext       Basically  I can t figure out how to add a bean to the applicationContext object given to setApplicationContext   Can anyone tell me how I am going about this the wrong way   Ok  this is what i ended up with as the solution    Override public void postProcessBeanDefinitionRegistry BeanDefinitionRegistry bdr          throws BeansException       BeanDefinition definition   new RootBeanDefinition               lt My Class gt  class        bdr registerBeanDefinition   lt my id gt    definition

User · Answer

First initialize Property values  MutablePropertyValues mutablePropertyValues   new MutablePropertyValues    mutablePropertyValues add  hostName   details getHostName     mutablePropertyValues add  port   details getPort      DefaultListableBeanFactory context   new DefaultListableBeanFactory    GenericBeanDefinition connectionFactory   new GenericBeanDefinition    connectionFactory setBeanClass Class   connectionFactory setPropertyValues mutablePropertyValues    context registerBeanDefinition  beanName   connectionFactory     Add to the list of beans  ConfigurableListableBeanFactory beanFactory     ConfigurableApplicationContext  applicationContext  getBeanFactory    beanFactory registerSingleton  beanName   context getBean  beanName

User · Answer

In Spring 3 0 you can make your bean implement BeanDefinitionRegistryPostProcessor and add new beans via BeanDefinitionRegistry    In previous versions of Spring you can do the same thing in BeanFactoryPostProcessor  though you need to cast BeanFactory to BeanDefinitionRegistry  which may fail

User · Answer

Why do you need it to be of type GenericWebApplicationContext  I think you can probably work with any ApplicationContext type   Usually you would use an init method  in addition to your setter method     PostConstruct public void init        AutowireCapableBeanFactory bf   this applicationContext          getAutowireCapableBeanFactory           wire stuff here     And you would wire beans by using either   AutowireCapableBeanFactory autowire Class  int mode  boolean dependencyInject   or  AutowireCapableBeanFactory initializeBean Object existingbean  String beanName

User · Answer

Actually AnnotationConfigApplicationContext derived from AbstractApplicationContext  which has empty postProcessBeanFactory method left for override         Modify the application context s internal bean factory after its standard    initialization  All bean definitions will have been loaded  but no beans    will have been instantiated yet  This allows for registering special    BeanPostProcessors etc in certain ApplicationContext implementations      param beanFactory the bean factory used by the application context     protected void postProcessBeanFactory ConfigurableListableBeanFactory beanFactory        To leverage this  Create AnnotationConfigApplicationContextProvider class which may look like following given for Vertx instance example  you can use MyClass instead      public class CustomAnnotationApplicationContextProvider   private final Vertx vertx   public CustomAnnotationApplicationContextProvider Vertx vertx        this vertx   vertx            Register all beans to spring bean factory        param beanFactory  spring bean factory to register your instances     private void configureBeans ConfigurableListableBeanFactory beanFactory        beanFactory registerSingleton  vertx   vertx             Proxy method to create   link AnnotationConfigApplicationContext  instance with no params        return   link AnnotationConfigApplicationContext  instance     public AnnotationConfigApplicationContext get         return new AnnotationConfigApplicationContext               Override         protected void postProcessBeanFactory ConfigurableListableBeanFactory beanFactory                super postProcessBeanFactory beanFactory               configureBeans beanFactory                              Proxy method to call   link AnnotationConfigApplicationContext AnnotationConfigApplicationContext DefaultListableBeanFactory   with our logic        param beanFactory bean factory for spring     return     see AnnotationConfigApplicationContext AnnotationConfigApplicationContext DefaultListableBeanFactory      public AnnotationConfigApplicationContext get DefaultListableBeanFactory beanFactory        return new AnnotationConfigApplicationContext beanFactory              Override         protected void postProcessBeanFactory ConfigurableListableBeanFactory beanFactory                super postProcessBeanFactory beanFactory               configureBeans beanFactory                              Proxy method to call   link AnnotationConfigApplicationContext AnnotationConfigApplicationContext Class     with our logic        param annotatedClasses  set of annotated classes for spring     return     see AnnotationConfigApplicationContext AnnotationConfigApplicationContext Class        public AnnotationConfigApplicationContext get Class lt   gt     annotatedClasses        return new AnnotationConfigApplicationContext annotatedClasses              Override         protected void postProcessBeanFactory ConfigurableListableBeanFactory beanFactory                super postProcessBeanFactory beanFactory               configureBeans beanFactory                              proxy method to call   link AnnotationConfigApplicationContext AnnotationConfigApplicationContext String      with our logic        param basePackages set of base packages for spring     return     see AnnotationConfigApplicationContext AnnotationConfigApplicationContext String         public AnnotationConfigApplicationContext get String    basePackages        return new AnnotationConfigApplicationContext basePackages              Override         protected void postProcessBeanFactory ConfigurableListableBeanFactory beanFactory                super postProcessBeanFactory beanFactory               configureBeans beanFactory                          While creating ApplicationContext you can create it using  Vertx vertx           either create or for vertx  it ll be passed to main verticle ApplicationContext context   new CustomAnnotationApplicationContextProvider vertx  get ApplicationSpringConfig class

User · Answer

Here is a simple code   ConfigurableListableBeanFactory beanFactory     ConfigurableApplicationContext  applicationContext  getBeanFactory    beanFactory registerSingleton bean getClass   getCanonicalName    bean

[java] Add Bean Programmatically to Spring Web App Context

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