11

经过 2 天的调试和尝试，除了向您寻求解决方案之外，我没有别的想法。

我想在 Tomcat WebApp 中使用 CDI（在 JEE6 上），只有简单的普通旧 java 对象（还）。据我所知，可以将 POJO java 类注入到其他 POJO Java 类中？！

这是我的示例类

  • 类 ToBeInjected（应用程序范围/单例）
  • 类 InjectingExample
  • ServletListener "ApplicationContextListener"

应用程序范围（单例）类“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!");
  }

}

注入上述类的“InjectingExample”类：

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();
  }

}

最后是创建 InjectingExample 实例并调用 sayHello()的ContextListener ：

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 >>>>>");
  }


}

我正在使用带有以下WEB-INF/web.xml的 Tomcat 6 ：

<?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>

和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>

最后，我将“weld-tomcat-support-1.0.1-Final.jar”复制到 ${CATALINA_HOME}/libs。

在 Tomcat 中部署和运行 webapp 会引发 NullPointerException，因为 InjectingExample 类中的成员“bean”为空（未注入）。

据我了解，这应该有效。我错了吗？

感谢您对这里的关注。希望我已经提到了对您有帮助的所有重要内容。否则告诉我你需要什么。

最后是cataling.log中的日志文件输出：

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 >>>>> [@]
4

1 回答 1

6

我快速查看了您在 Tomcat 上的 Weld 设置，它看起来不错（以防万一，如果需要，请参阅18.3.1. Tomcat了解详细信息）。

但是，我有一些问题/意见：

  • 您的存档 CDI 是否启用？换句话说，您是否有beans.xml文件（对于 Web 应用程序，该beans.xml文件可以在WEB-INF目录中，也可以在WEB-INF/classes/META-INF目录中）？请参阅为什么 CDI 中需要 beans.xml？

  • new InjectionExample()如果您希望 bean 由 CDI 管理，您不应该自己实例化 bean（如在 中）。使用@Inject.

我并没有真正注意到你试图在 a 中注入一些东西ContextListener，我太专注于new操作符的使用。话虽如此，虽然 Weld 文档指出CDI 规范要求容器为所有 Java EE 组件类提供对非上下文资源的注入，但我完全确定这涵盖了哪些内容，尤其是在使用 Tomcat 时。

就个人而言，我会尝试首先让 CDI 与 Servlet 一起工作（或者可能使用成熟的 Java EE 6 服务器来避免任何限制）。

于 2010-10-01T10:51:04.317 回答