Question

我有两个模块WAR和Business。

我尝试在Web模块中注入无状态bean。但无法找到无状态豆？

错误在哪里？任何想法??

在业务模块中：

@Stateless
public class BusinessFacade {

    public void processEntity(final MyEntitiy entity) {
        System.out.println(entity.getName());
    }

}

在WAR模块中：

@ManagedBean
@SessionScoped
public class HelloBean implements Serializable {

    @EJB
    BusinessFacade businessFacade;

    private static final long serialVersionUID = 1L;

    private String name;

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }
}

错误：

[31.08.12 10:19:38:835 CEST] 00000018 webapp        E com.ibm.ws.webcontainer.webapp.WebApp notifyServletContextCreated SRVE0283E: Exception caught while initializing context: {0}
                                 java.lang.NoClassDefFoundError: com.myproject.business.beans.BusinessFacade
    at java.lang.Class.getDeclaredFieldsImpl(Native Method)
    at java.lang.Class.getDeclaredFields(Class.java:544)
    at org.apache.myfaces.config.annotation.AnnotationConfigurator.fields(AnnotationConfigurator.java:846)
    at org.apache.myfaces.config.annotation.AnnotationConfigurator.createFacesConfig(AnnotationConfigurator.java:328)
    at org.apache.myfaces.config.annotation.AnnotationConfigurator.createFacesConfig(AnnotationConfigurator.java:94)
    at org.apache.myfaces.config.DefaultFacesConfigurationProvider.getAnnotationsFacesConfig(DefaultFacesConfigurationProvider.java:148)
    at org.apache.myfaces.config.DefaultFacesConfigurationMerger.getFacesConfigData(DefaultFacesConfigurationMerger.java:91)

....
..

Caused by: java.lang.ClassNotFoundException: com.myproject.business.beans.BusinessFacade
    at java.net.URLClassLoader.findClass(URLClassLoader.java:434)
    at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:198)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:646)
    at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:113)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:612)
    at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:62)
    at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:58)
    at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:564)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:612)
    at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:564)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:612)
    ... 33 more

Answer 1

试试这个，看看会发生什么：

@Stateless
@LocalBean
public class BusinessFacade {

    public void processEntity(final MyEntitiy entity) {
       System.out.println(entity.getName());
    }

}

Answer 2

我认为你不能那么简单地做到这一点。这种类型的注入在同一个EAR中的EJB之间工作，但是如果我在JBoss 5.0GA中正确记得你不能将EJB注入到Servlet中等等（你应该检查我是否正确）。

您应该告诉您是否使用EAR来保存Web模块和EJB部件，或者以其他方式部署它们。

看看here它可以以某种方式帮助你。

Answer 3

创建界面

@Local
public interface BusinessLocal {
    void processEntity(final MyEntitiy entity);
}

在ejb中实现界面

public class BusinessFacade implements BusinessLocal {
...
}

注入界面。

@EJB
BusinessLocal businessFacade;

无法找到EJB无状态Bean。注射失败

3 个答案: