问题描述
我将EJB注入到抽象类中是一个问题，该抽象类是我的JSF CDI bean的父类。在我的项目中，我正在使用MyFaces CODI 1.0.5（ViewScope），Omnifaces 1.3，PrimeFaces 3.4.2和GlassFish 3.1.2。
I have a problem with injecting an EJB into an abstract class which is the parent of my JSF CDI beans. In my project I am using MyFaces CODI 1.0.5 (ViewScope), Omnifaces 1.3, PrimeFaces 3.4.2 and GlassFish 3.1.2.
应用程序是EAR，抽象类在EJB模块中，而JSF CDI bean在WAR模块中：
The application is an EAR, the abstract class is in an EJB module and the JSF CDI beans are in a WAR module:
webframework-demo.ear
|__ webframework-war.war -> concrete JSF CDI bean
|__ webframework-ejb-lib.jar -> abstract class with EJB injection
|__ lib\
|__ shared libs
我的抽象类：
public abstract class AbstractListPageAction<T extends AbstractViewBean<K>, K extends Serializable> {
...
@EJB
private CriteriaFacadeLocal<K> facade;
@PostConstruct
public void create() {
...
facade.setEntityClass(getEntityClass());
...
}
...
public abstract Class<K> getEntityClass();
}
我的CDI bean：
My CDI bean:
import org.apache.myfaces.extensions.cdi.core.api.scope.conversation.ViewAccessScoped;
@Named
@ViewAccessScoped
public class UserListAction extends AbstractListPageAction<UserViewBean, UserEntity>
implements Serializable {
private static final long serialVersionUID = -1178878323047991855L;
...
@Override
public Class<UserEntity> getEntityClass() {
return UserEntity.class;
}
...
}
当我部署应用程序并访问JSF页面时，将创建UserListAction，但不会注入CriteriaFacadeLocal，并且在@PostConstruct方法中以NullPointerException结尾。
When I deploy the application and access a JSF page, UserListAction is created but CriteriaFacadeLocal is not injected and I end with a NullPointerException in the @PostConstruct method.
当我更改UserListAction时并添加一个空的@PostConstruct方法，然后注入CriteriaFacade，一切正常：
When I change UserListAction and add an empty @PostConstruct method then CriteriaFacade is injected and everything works fine:
@Named
@ViewAccessScoped
public class UserListAction extends AbstractListPageAction<UserViewBean, UserEntity>
implements Serializable {
private static final long serialVersionUID = -1178878323047991855L;
...
@PostConstruct
public void init() {
}
@Override
public Class<UserEntity> getEntityClass() {
return UserEntity.class;
}
...
}
我在每个模块中都有beans.xml。但是，为什么我的CDI bean中必须有一个空的@PostConstruct方法？
I have beans.xml in every module. But why must I have an empty @PostConstruct method in my CDI bean? Is there a problem with an abstract class placed in a EJB module?
推荐答案
我是根据编辑后的问题创建的答案：
我认为EAR / EAR模块类加载器可能存在问题。我将webframework-ejb-lib.jar移到了webframework-war.war WEB-INF / lib文件夹中：
I figured that it was probably a problem with the EAR/EAR modules classloaders. I moved webframework-ejb-lib.jar into the webframework-war.war WEB-INF/lib folder:
webframework-demo.ear
|__ webframework-war.war -> concrete JSF CDI bean
| |__ WEB-INF
| |__lib
| |__ webframework-ejb-lib.jar -> abstract class with EJB injection
|__ ... (other ejb modules)
|__ lib\
|__ shared libs
突然一切都好了。
这篇关于如何将EJB注入抽象CDI类？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！