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Использование CDI (Weld) в Tomcat с помощью простых POJO-классов

После двух дней отладки и попыток у меня нет другой идеи, кроме как просить вас о решении.

Я хочу использовать CDI (на JEE6) в Tomcat WebApp с помощью простых простых старых java-объектов (пока). Насколько я знаю, просто можно вводить классы Java POJO в другие классы Java POJO?!

Вот мои примеры классов

  • класс ToBeInjected (Application-scoped/singleton)
  • класс InjectingExample
  • ServletListener "ApplicationContextListener"

Класс приложения (singleton) "ToBeInjected" :

import javax.enterprise.context.ApplicationScoped;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@ApplicationScoped
public class ToBeInjected {
  private final Logger log = LoggerFactory.getLogger(ToBeInjected.class);

  public ExampleBean() {
    log.info("ToBeInjected init");
  }

  public void sayHello() {
    log.info("Hello from ToBeInjected!");
  }

}

класс "InjectingExample" , который вводит вышеуказанный класс:

import javax.inject.Inject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class InjectingExample {
  private final Logger log = LoggerFactory.getLogger(InjectingExample.class);

  @Inject
  private ExampleBean bean;

  public InjectionExample() {
    log.info("InjectingExample init");
  }

  public void sayHello() {
    log.info("InjectingExample tries to say hello ...");
    bean.sayHello();
  }

}

Наконец, существует ContextListener, который создал экземпляр InjectingExample и вызывает sayHello():

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.btc.dtv.gw.core.common.log.LogMarker;

public class ApplicationContextListener implements ServletContextListener {
  private final Logger log = LoggerFactory.getLogger(ApplicationContextListener.class);

  @Override
  public void contextInitialized(ServletContextEvent arg0) {
    log.info(">>>>> Startup >>>>>");
    try {
      InjectionExample example = new InjectionExample();
      example.sayHello(); // uses internally the injected singleton class
    }
    catch(Exception ex) {
      log.error("Error (nothing injected?)", ex);
    }
    log.info(">>>>> Startup DONE >>>>>");
  }


}

Я использую Tomcat 6 со следующим WEB-INF/web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">

    <listener>
        <listener-class>org.jboss.weld.environment.servlet.Listener</listener-class>
    </listener>

    <listener>
        <listener-class>com.btc.dtv.gw.ApplicationContextListener</listener-class>
    </listener>

    <resource-env-ref>
        <description>Object factory for the CDI Bean Manager</description>
        <resource-env-ref-name>BeanManager</resource-env-ref-name>
        <resource-env-ref-type>javax.enterprise.inject.spi.BeanManager</resource-env-ref-type>
    </resource-env-ref>

</web-app>

И META-INF/context.xml:

<?xml version="1.0" encoding="UTF-8"?>
<Context>
   <Resource name="BeanManager" 
             auth="Container" 
             type="javax.enterprise.inject.spi.BeanManager" 
             factory="org.jboss.weld.resources.ManagerObjectFactory" />

   <!-- Uncomment to enable injection into Servlets, Servlet Listeners and Filters in Tomcat -->
   <Listener className="org.jboss.weld.environment.tomcat.WeldLifecycleListener" />

</Context>

Наконец, я скопировал "weld-tomcat-support-1.0.1-Final.jar" в ${CATALINA_HOME}/libs.

Развертывание и запуск webapp в Tomcat вызывает исключение NullPointerException, потому что член "bean" в классе InjectingExample имеет значение null (не вводится).

Насколько я понял, это должно сработать. Я не прав?

Thanx для вашего внимания, пока здесь. Надеюсь, я упомянул все, что вам нужно, чтобы помочь мне. Otherweise скажите мне, что вам нужно.

Наконец, вывод журнала в cataling.log:

12:05:17.716 [http-8080-1] INFO   LOCALIZED org.jboss.weld.Version - WELD-000900 1.0.1 (Final) [@] 
12:05:17.763 [http-8080-1] INFO   LOCALIZED org.jboss.weld.Bootstrap - WELD-000101 Transactional services not available. Injection of @Inject UserTransaction not available. Transactional observers will be invoked synchronously. [@] 
12:05:17.888 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000103 Enabled alternatives for Manager
Enabled alternatives: [] []
Registered contexts: [interface javax.enterprise.context.ConversationScoped, interface javax.enterprise.context.ApplicationScoped, interface javax.inject.Singleton, interface javax.enterprise.context.SessionScoped, interface javax.enterprise.context.Dependent, interface javax.enterprise.context.RequestScoped]
Registered beans: 1
Specialized beans: 0
: [] [] [@] 
12:05:17.888 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000104 Enabled decorator types for Manager
Enabled alternatives: [] []
Registered contexts: [interface javax.enterprise.context.ConversationScoped, interface javax.enterprise.context.ApplicationScoped, interface javax.inject.Singleton, interface javax.enterprise.context.SessionScoped, interface javax.enterprise.context.Dependent, interface javax.enterprise.context.RequestScoped]
Registered beans: 1
Specialized beans: 0
: [] [@] 
12:05:17.888 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000105 Enabled interceptor types for Manager
Enabled alternatives: [] []
Registered contexts: [interface javax.enterprise.context.ConversationScoped, interface javax.enterprise.context.ApplicationScoped, interface javax.inject.Singleton, interface javax.enterprise.context.SessionScoped, interface javax.enterprise.context.Dependent, interface javax.enterprise.context.RequestScoped]
Registered beans: 1
Specialized beans: 0
: [] [@] 
12:05:17.888 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000103 Enabled alternatives for Manager
Enabled alternatives: [] []
Registered contexts: [interface javax.enterprise.context.ConversationScoped, interface javax.enterprise.context.ApplicationScoped, interface javax.inject.Singleton, interface javax.enterprise.context.SessionScoped, interface javax.enterprise.context.Dependent, interface javax.enterprise.context.RequestScoped]
Registered beans: 1
Specialized beans: 0
: [] [] [@] 
12:05:17.888 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000104 Enabled decorator types for Manager
Enabled alternatives: [] []
Registered contexts: [interface javax.enterprise.context.ConversationScoped, interface javax.enterprise.context.ApplicationScoped, interface javax.inject.Singleton, interface javax.enterprise.context.SessionScoped, interface javax.enterprise.context.Dependent, interface javax.enterprise.context.RequestScoped]
Registered beans: 1
Specialized beans: 0
: [] [@] 
12:05:17.888 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000105 Enabled interceptor types for Manager
Enabled alternatives: [] []
Registered contexts: [interface javax.enterprise.context.ConversationScoped, interface javax.enterprise.context.ApplicationScoped, interface javax.inject.Singleton, interface javax.enterprise.context.SessionScoped, interface javax.enterprise.context.Dependent, interface javax.enterprise.context.RequestScoped]
Registered beans: 1
Specialized beans: 0
: [] [@] 
12:05:18.013 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Reflection - WELD-000602 interface javax.enterprise.inject.Default is not declared @Target(TYPE, METHOD) or @Target(TYPE) [@] 
12:05:18.013 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Reflection - WELD-000601 interface javax.inject.Named is missing @Target [@] 
12:05:18.013 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Reflection - WELD-000602 interface javax.enterprise.context.RequestScoped is not declared @Target(TYPE, METHOD) or @Target(TYPE) [@] 
12:05:18.013 [http-8080-1] WARN          org.jboss.interceptor.model.InterceptionTypeRegistry - Class 'javax.ejb.PostActivate' not found, interception based on it is not enabled [@] 
12:05:18.013 [http-8080-1] WARN          org.jboss.interceptor.model.InterceptionTypeRegistry - Class 'javax.ejb.PrePassivate' not found, interception based on it is not enabled [@] 
12:05:18.029 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ManagedBean-class org.jboss.weld.conversation.ConversationImpl [@] 
12:05:18.029 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: Built-in implicit javax.event.Event bean [@] 
12:05:18.029 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Reflection - WELD-000602 interface javax.enterprise.context.SessionScoped is not declared @Target(TYPE, METHOD) or @Target(TYPE) [@] 
12:05:18.029 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ManagedBean-class org.jboss.weld.conversation.ServletConversationManager [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ProducerMethod-org.jboss.weld.conversation.ServletConversationManager.method getConversationIdName() [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ManagedBean-class org.jboss.weld.conversation.NumericConversationIdGenerator [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: Built-in implicit javax.inject.Instance bean [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-NewManagedBean-class org.jboss.weld.conversation.ConversationImpl [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: Built-in javax.inject.manager.InjectionPoint bean [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ProducerMethod-org.jboss.weld.conversation.ServletConversationManager.method getConversationTimeoutInMilliseconds() [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-NewManagedBean-class org.jboss.weld.conversation.ServletConversationManager [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ProducerMethod-org.jboss.weld.conversation.ServletConversationManager.method getConversationConcurrentAccessTimeout() [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-NewManagedBean-class org.jboss.weld.conversation.NumericConversationIdGenerator [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Reflection - WELD-000602 interface javax.enterprise.inject.Produces is not declared @Target(TYPE, METHOD) or @Target(TYPE) [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ManagedBean-class org.jboss.weld.servlet.HttpSessionManager [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-NewManagedBean-class org.jboss.weld.servlet.HttpSessionManager [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-weld-ProducerMethod-org.jboss.weld.servlet.HttpSessionManager.method getSession() [@] 
12:05:18.044 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Reflection - WELD-000602 interface javax.enterprise.context.ApplicationScoped is not declared @Target(TYPE, METHOD) or @Target(TYPE) [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-ManagedBean-class com.bsp.app.ToBeInjected [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: Built-in javax.inject.manager.InjectionPoint bean [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-NewManagedBean-class com.bsp.app.services.products.impl.ProductServiceImpl [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-NewManagedBean-class com.bsp.app.ToBeInjected [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: Built-in implicit javax.inject.Instance bean [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-ManagedBean-class com.bsp.app.services.products.impl.ProductServiceImpl [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-NewManagedBean-class com.bsp.app.services.products.ProductServiceModule [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-NewManagedBean-class com.bsp.app.InjectingExample [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-ManagedBean-class com.bsp.app.services.products.ProductServiceModule [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: Built-in implicit javax.event.Event bean [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000106 Bean: org.jboss.weld.bean-flat-ManagedBean-class com.bsp.app.InjectingExample [@] 
12:05:18.091 [http-8080-1] DEBUG  LOCALIZED org.jboss.weld.Bootstrap - WELD-000100 Weld initialized. Validating beans [@] 
12:05:18.200 [http-8080-1] INFO   TEC    com.bsp.app.ApplicationContextListener - >>>>> Startup >>>>> [@] 
12:05:18.200 [http-8080-1] INFO          com.bsp.app.InjectingExample - InjectionExample init [@] 
12:05:18.200 [http-8080-1] INFO          com.bsp.app.InjectingExample - InjectionExample tries to say hello ... [@] 
12:05:18.200 [http-8080-1] ERROR         com.bsp.app.ApplicationContextListener - Error (injection failed?) [@] 
java.lang.NullPointerException
    at com.bsp.app.InjectingExample.sayHello(InjectingExample.java:21) [InjectingExample.class:na]
    at com.bsp.app.ApplicationContextListener.contextInitialized(ApplicationContextListener.java:20) [ApplicationContextListener.class:na]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135) [catalina.jar:6.0.29]
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630) [catalina.jar:6.0.29]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) [catalina.jar:6.0.29]
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) [catalina.jar:6.0.29]
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546) [catalina.jar:6.0.29]
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905) [catalina.jar:6.0.29]
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:525) [catalina.jar:6.0.29]
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1359) [catalina.jar:6.0.29]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [na:1.6.0_18]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [na:1.6.0_18]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [na:1.6.0_18]
    at java.lang.reflect.Method.invoke(Method.java:597) [na:1.6.0_18]
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297) [tomcat-coyote.jar:6.0.29]
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) [na:1.6.0_18]
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) [na:1.6.0_18]
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1500) [catalina.jar:6.0.29]
    at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:670) [catalina.jar:6.0.29]
    at org.apache.catalina.manager.ManagerServlet.doPut(ManagerServlet.java:435) [catalina.jar:6.0.29]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:640) [servlet-api.jar:na]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) [servlet-api.jar:na]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) [catalina.jar:6.0.29]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:6.0.29]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) [catalina.jar:6.0.29]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [catalina.jar:6.0.29]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563) [catalina.jar:6.0.29]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [catalina.jar:6.0.29]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [catalina.jar:6.0.29]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [catalina.jar:6.0.29]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) [catalina.jar:6.0.29]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857) [tomcat-coyote.jar:6.0.29]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) [tomcat-coyote.jar:6.0.29]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) [tomcat-coyote.jar:6.0.29]
    at java.lang.Thread.run(Thread.java:619) [na:1.6.0_18]
12:05:18.200 [http-8080-1] INFO   TEC    com.bsp.app.ApplicationContextListener - >>>>> Startup DONE >>>>> [@]
4b9b3361

ОТВЕТЫ

Ответ 1

У меня был быстрый взгляд на настройку Weld на Tomcat, и это выглядит нормально (на всякий случай, см. 18.3.1. Tomcat если требуется).

Однако у меня есть несколько вопросов/замечаний:

  • Включен ли ваш архив CDI? Другими словами, у вас есть файл beans.xml (для веб-приложения, файл beans.xml может находиться в каталоге WEB-INF или в каталоге WEB-INF/classes/META-INF)? См. Почему в CDI требуется beans.xml?

  • Вы не должны создавать beans самостоятельно (например, new InjectionExample()), если хотите, чтобы ваш beans управлялся с помощью CDI. Используйте @Inject.

Я действительно не обращал внимания на то, что вы пытались что-то вставить в ContextListener, я был слишком сосредоточен на использовании оператора new. В то время как документация Weld заявляет, что спецификация CDI требует, чтобы контейнер обеспечивал впрыскивание в неконтекстные ресурсы для всех классов компонентов Java EE, я полностью уверен в том, что это касается, особенно при использовании Tomcat.

Лично я попытался бы заставить CDI работать с сервлетом в первую очередь (или, возможно, использовать полномасштабный сервер Java EE 6, чтобы избежать каких-либо ограничений).