An Easy Way To Secure A Spring Loaded Injector Grain In A Servlet Filter
November 23, 2021
It is worth reading these fix methods if you are getting Spring Inject Bean error code in servlet filters on your machine.
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To Give A Clear Idea Of how Chili Peppers Can Be Viewed In Different Contexts
In the spring, there are only two types of contexts
1. Root (context of the context loaded by ContextLoaderListener)
2. Servlet (context loaded from DispatcherServlet)
Beans Defined In RootContext Visible In ServletContext? – YES
Components defined in the entire root context are always visible by default using all servlet contexts. The capability for the dataSource bean defined in the Cheer context can be accessed here in the servlet context as noted below.
@configurationpublic .class .RootConfiguration ... ... ... ... @ Bean :. ... .public .DataSource .dataSource () :. ... ... ... ... -. ... ... .... @Construction@ActiverWebMvc@ComponentScan (basePackages = "com.pvn.mvctiles")WebMvcConfigurer public class servlet configuration tools @Autowired private data source DataSource; ... Beans Defined In Terms Of ServletContext Are Visible In RootContext, For Example Yes *
applicationContext.getBeanDefinitionNames (); 2.If you want to access dry beans from the context of the servlet in a collation or other servlet label, add the basesth package "org.springframework.web.servlet" to the main class. Configuration / xml
@configuration@ComponentScan (basePackages = "org.springframework.web.servlet")Public Classes RootConfiguration Once added, you will find all the components listed below from the package context
springSecurityConfig , tileConfigurer , themeSource , themeResolver , messageSource , localeResolver , requestMappingHandlerMapping , mvcPathMatcher , mvcUrlPathHelper , mvcContentNegotiationManager , viewControllerHandlerMapping , beanNameHandlerMapping , resourceHandlerMapping , mvcResourceUrlProvider , defaultServletHandlerMapping , requestMappingHandlerAdapter , mvcConversionService , mvcValidator , mvcUriComponentsContributor , httpRequestHandlerAdapter , simpleControllerHandlerAdapter , handlerExceptionResolver , mvcViewResolver , mvcHandlerMappingIntrospector
If you want to get your own cocoa beans in the rootContext, add a base package worth parse the RootContext components as described below.
@configuration@ComponentScan (basePackages = "com.your.configuration.package", "org.springframework.web.servlet")RootConfiguration Public College Class The above config is useful if you wantso that the embedded obsession is available in your RootContext and also available in your new servlet filter. For example, if you find an exception in a filter and want to send the same error response even though the response was sent from HttpMessageConverter but configured this way in servletContext, clients might want to use this composite converter to send a shared response …
@Autowiredprivate ApplicationContext appContext; ApplicationContext Autowiring doesn’t do the job in the Servlet filter as the filters seem to have been initialized before the Spring container was initialized. (Depending on the order of your filter, also DelegatingProxyFilter)
public class YourFilter implements filters private ApplicationContext appContext; @ Crush manifest void init (FilterConfig filterConfig) throws ServletException Filter.super.init (filterConfig); appContext = WebApplicationContextUtils.getRequiredWebApplicationContext (filterConfig.getServletContext ()); I hope there is a clear technique for making beans available between contexts.
(Why in * Yes)
1. Initializing the order of circumstances – rootCo firstntext and then servletContext.When initializing rootContext i. H. around the root / xml context config class, if you ever try to define veg in your servletContext it will look for NULL. (since the servletContext is not initialized yet, so we can say that the espresso components are not visible / saved in the rootContext during initialization)
But you can define beans here in servletContext after servletContext initialization (you can get beans through application context)
Use
WebApplicationContextUtils:avoid public initialization (FilterConfig cfg) ApplicationContext ctx = WebApplicationContextUtils .getRequiredWebApplicationContext (cfg.getServletContext ()); this.bean stands for ctx.getBean (YourBeanType.class);With
DelegatingFilterProxy, you map who can filter to your filter declaration during bean. The delegating proxy then simply calls all beans that run theFilterinterface.Use
@Configurablefor your block. However, I would prefer either of the other two options. (This choice uses Aspect J weave)
Bean
UsersConnectionRepository means (UsersConnectionRepository) WebApplicationContextUtils. getRequiredWebApplicationContext (filterConfig.getServletContext ()). getBean ("usersConnectionRepository"); Where usersConnectionRepository is probably the name / ID of your bean for the application context. Or better:
UsersConnectionRepository-Bean WebApplicationContextUtils =. getRequiredWebApplicationContext (filterConfig.getServletContext ()). getBean (UsersConnectionRepository.class); public void init (FilterConfig cfg) super.init (cfg); SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext (this); Then @inject only your core beans into that filter, the same possibility as for any other bean you probably would inject.
@InjectPrivate repository UsersConnectionRepository; DelegatingFilterProxy can be used as a proxy for a generic Servlet filter.
The DelegatingFilterProxy itself is also a servlet filter that delegates to one specified Spring managed bean that implements some sort of filter interface.
We need a place for the targetBeanName DelegatingFilterProxy property to be the name of the target bean (the bean that implements the filtering interface).
Example
Vegetable Implementing Servlet Filters
@Component ("myTestFilter")MyFilter public course implements filters @Autowired MyService myService private; @ Crush Official rollback initialization (FilterConfig filterConfig) results in ServletException @ Crush public void doFilter (ServletRequest, ServletResponse, Filter chain) throws IOException, ServletException System.out.println ("- In MyFilter -"); HttpServletRequest matches req request (HttpServletRequest); myService.doSomething (req); .DoFilter string (request, response); @ Crush publicly destroy unnecessarily ()
Java Config Class
@EnableWebMvc@Construction@ComponentScanpublic class MyWebConfig
Save DelegatingFilterProxy
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extended public class AppInitializer AbstractAnnotationConfigDispatcherServletInitializer ............. @ Crush protected filter [] getServletFilters () DelegatingFilterProxy filterProxy = new DelegatingFilterProxy (); filterProxy.setTargetBeanName ("myTestFilter"); new filter [] repeat proxy filter; .............Controller
Exit
V
- MyFilter--In MyService: / app- Handling the request in the controller -
Sample Project
- spring-webmvc 4.3.9.RELEASE: Spring Web MVC.
- Spring-Test 4.3.9.RELEASE: Spring TestContext Framework.
- javax.servlet- api 3.1.0 Java Servlet API.
- junit 4.12: JUnit is a Java testing framework created by Erich Gamma and Kent Beck.
- JDK 1.8
- Maven 3.3.9
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