在我的石英工作中注射

Question

我想知道如何使用guice在我的工作中使用注射.由于我不能在默认构造函数上使用@Inject,我可以直接在属性上使用它(如下所示)(我总是得到一个带有PersonDAO的NullPointerException)？我知道DAO在这里无关,但它只是用于测试.

public class SimpleQuartzJob implements Job {

  @Inject PersonDao Person;

  private static Logger logger = Logger.getLogger(SimpleQuartzJob.class.getName());

  public SimpleQuartzJob() {
  }

  @Override
  public void execute(JobExecutionContext context) throws JobExecutionException {
    if (logger.isDebugEnabled()) logger.debug("In SimpleQuartzJob - executing its JOB at " 
        + new Date() + " by " + context.getTrigger().getName());

        // ... LOGIC ...
  }

} 

在我的模块中,我有以下声明:

bind(PersonDao.class).to(HibernatePersonDaoImpl.class);

实际上我在这里使用PersonDao'因为我知道它在另一个带注入的类中工作(但注入是在那里的构造函数级别完成的).

有人可以给我一个建议吗？

这里有关于quartz config的更多信息:

web.xml中:

  <servlet>  
    <servlet-name>QuartzInitializer</servlet-name>  
    <display-name>Quartz Initializer Servlet</display-name>  
    <servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>  
    <load-on-startup>1</load-on-startup>  
    <init-param>  
        <param-name>config-file</param-name>  
        <param-value>/quartz.properties</param-value>  
    </init-param>  
    <init-param>  
        <param-name>shutdown-on-unload</param-name>  
        <param-value>true</param-value>  
    </init-param>  
    <init-param>  
        <param-name>start-scheduler-on-load</param-name>  
        <param-value>true</param-value>  
    </init-param>  
</servlet>

quartz.properties:

org.quartz.plugin.jobInitializer.class=org.quartz.plugins.xml.XMLSchedulingDataProcessorPlugin
org.quartz.plugin.jobInitializer.fileNames=quartz-config.xml
org.quartz.plugin.jobInitializer.failOnFileNotFound = true
org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool
org.quartz.threadPool.threadCount = 5
org.quartz.threadPool.threadPriority = 5

quartz-config.xml:

<?xml version='1.0' encoding='utf-8'?>
<job-scheduling-data xmlns="http://www.quartz-scheduler.org/xml/JobSchedulingData"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.quartz-scheduler.org/xml/JobSchedulingData http://www.quartz-scheduler.org/xml/job_scheduling_data_1_8.xsd"
  version="1.8">

    <schedule>
        <job>
            <name>mail-job</name>
            <group>MYJOB_GROUP</group>

            <description>The job description</description>
            <job-class>svc.data.server.quartz.SimpleQuartzJob</job-class>
        </job>

        <trigger>
            <cron>
                <name>my-trigger</name>
                <group>MYTRIGGER_GROUP</group>
                <job-name>mail-job</job-name>

                <job-group>MYJOB_GROUP</job-group>
                <cron-expression>10 * * * * ?</cron-expression>

            </cron>
        </trigger>
    </schedule>
</job-scheduling-data>

Answer 1

显然,此时喷射器不可用.这是解决方案,我测试了它的工作原理:http: //codesmell.wordpress.com/2009/01/11/quartz-fits/