Question

我遇到了一个非常奇怪的错误，我无法理解。简而言之：我有一个ImporterBean应该读取一个xml文件，然后做一些事情。 ImporterBicker是由ImporterKicker“kickstart”，但是当我启动应用程序时 ImporterBean类中的ApplicationBean和EntityManager为null。他们是没注入那个豆子。在KickerBean中，正确注入了ImporterBean和ApplicationBean。

请参阅下面的代码，请告诉我我做错了什么（使用seam SEAM 2.2.1.CR2）。

@SuppressWarnings({"UnusedDeclaration"})
@Name("importerBean")
@AutoCreate
public class ImporterBean {

private static final FilenameFilter ONLY_XML_FILES = (FilenameFilter) new SuffixFileFilter(".xml");
public static final String IN_DIR = "IN";
public static final String ERROR_DIR = "ERROR";
public static final String PROCESSED_DIR = "PROCESSED";

@In(create = true)
public ApplicationBean applicationBean;

@In
private EntityManager entityManager;


@Asynchronous
@Transactional
public void runImport(@Duration long firstStart, @IntervalDuration long startTimer) {
    log.info("<118100>");
    File inDir = Doing some file stuff...
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

/**
 * Inner class bean to kick the background tasks.
 */
@Startup
@Scope(APPLICATION)
@Name("importerKicker")
public static class ImporterKicker {


    @In(create = true)
    public ImporterBean importerBean;

    @In(create = true)
    public ApplicationBean applicationBean;

    @Create
    public void scheduleOptimizer() {
        final int interval = applicationBean.getImporter118checkInterval();
        if (interval != 0) {

            importerBean.runImport(30 * MILLIS_PER_SECOND, interval * MILLIS_PER_SECOND);
        } else {
        }
    }

}

}

Answer 1

此错误是此症状： FullTextHibernateSessionProxy is not visible from class loader

Answer 2

由于您使用的是异步调用，因此不能在事件范围的组件中使用这样的注入。

而是在Asyncrhonous方法内写：

@Asynchronous
@Transactional
public void runImport(@Duration long firstStart, @IntervalDuration long startTimer) {
    EntityManager entityManager = (EntityManager) Component.getInstance("entityManager");
    ApplicationBean applicationBean = (ApplicationBean) Component.getInstance("applicationBean",true);
    log.info("<118100>");
    File inDir = Doing some file stuff...
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

java.lang.IllegalArgumentException：从类加载器看不到接口org.jboss.seam.persistence.EntityManagerProxy

2 个答案: