title: Spring security and authentication provider
body: <p>I'm trying to implement Spring 3 Security in a project, but I can not get rid of the following error:</p>
  
  <pre><code>SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
  org.springframework.beans.factory.BeanCreationException: Error creating bean with name '_methodSecurityInterceptor': Cannot resolve reference to bean '_authenticationManager' while setting bean property 'authenticationManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '_authenticationManager': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No authentication providers were found in the application context
      at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328)
      at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:106)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1317)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1076)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
      at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
      at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
      at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
      at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:563)
      at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:872)
      at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)
      at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
      at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
      at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
      at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
      at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
      at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
      at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
      at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
      at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:637)
      at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:563)
      at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:498)
      at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
      at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
      at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
      at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
      at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
      at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
      at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
      at org.apache.catalina.core.StandardService.start(StandardService.java:519)
      at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
      at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
      at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
  Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '_authenticationManager': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No authentication providers were found in the application context
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1412)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
      at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
      at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
      at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
      at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
      at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)
      ... 39 more
  Caused by: java.lang.IllegalArgumentException: No authentication providers were found in the application context
      at org.springframework.util.Assert.notEmpty(Assert.java:268)
      at org.springframework.security.config.NamespaceAuthenticationManager.afterPropertiesSet(NamespaceAuthenticationManager.java:31)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1469)
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1409)
      ... 46 more
  </code></pre>
  
  <p>This seems weird, as I did provide an authentication provider!</p>
  
  <p>I've added these lines to web.</p>
  
  <pre><code>&lt;filter&gt;
      &lt;filter-name&gt;springSecurityFilterChain&lt;/filter-name&gt;
      &lt;filter-class&gt;org.springframework.web.filter.DelegatingFilterProxy&lt;/filter-class&gt;
  &lt;/filter&gt;
  &lt;filter-mapping&gt;
      &lt;filter-name&gt;springSecurityFilterChain&lt;/filter-name&gt;
      &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
  &lt;/filter-mapping&gt;
  </code></pre>
  
  <p>And this is my applicationContext-security.xml:
  (Edit: full xml)</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;beans:beans xmlns="http://www.springframework.org/schema/security"
           xmlns:beans="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
         http://www.springframework.org/schema/security
         http://www.springframework.org/schema/security/spring-security-3.0.xsd"&gt;
      &lt;http auto-config="false"&gt;
          &lt;intercept-url pattern="/**" access="ROLE_USER" /&gt;        
          &lt;http-basic /&gt;
      &lt;/http&gt;
  
      &lt;authentication-manager alias="authenticationManager"&gt;
          &lt;authentication-provider&gt;
              &lt;user-service&gt;
                  &lt;user name="jimi" password="jimispassword" authorities="ROLE_USER, ROLE_ADMIN"/&gt;
                  &lt;user name="bob" password="bobspassword" authorities="ROLE_USER"/&gt;
              &lt;/user-service&gt;
          &lt;/authentication-provider&gt;
      &lt;/authentication-manager&gt;
  &lt;/beans:beans&gt;
  </code></pre>
  
  <p>Google couldn't help me much further, nor could the official documentation.</p>