如何将CDI @ApplicationScoped bean注入@RequestScoped JAX-RS bean? [英] How do I @Inject a CDI @ApplicationScoped bean into a @RequestScoped JAX-RS bean?

问题描述

我已将@ApplicationScoped CDI批注添加到一个简单的bean:

I've added the @ApplicationScoped CDI annotation to a simple bean:

@ApplicationScoped
public class History {

然后尝试将其@Inject转换为JAX-RS(resteasy)bean:

And tried to then @Inject this into a JAX-RS (resteasy) bean:

@RequestScoped
@Path("/history")
public class HistoryAPI {

@Inject
private History history;

但是历史记录仍然为空.我在WEB-INF中有一个beans.xml文件.我已经尝试了很多关于此主题的变体，但是尽管应用服务器(Wildfly)承认它是从CDI开始的，但是我无法使注入工作.有什么想法我想念的吗?谢谢.

But history remains null. I've got a beans.xml file in WEB-INF. I've tried a lot of variations on this theme, but while the app server (Wildfly) acknowledges it's starting with CDI I can't get the injection to work. Any ideas what I"m missing? Thanks.

ETA:我尝试​​了一个空的beans.xml和几个变体，最新的是:

ETA: I've tried an empty beans.xml and a couple of variants, the latest being:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:weld="http://jboss.org/schema/weld/beans"
       xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://docs.jboss.org/cdi/beans_1_0.xsd
                           http://jboss.org/schema/weld/beans http://jboss.org/schema/weld/beans_1_1.xsd">
</beans>

推荐答案

奇怪...我认为您的代码应该可以工作...

strange... i think your code should work...

我在GitHub上创建了此问题的示例(已通过Wildly 8.2.0.Final和Glassfish 4.1进行了测试):

i have create a example for this question on GitHub (Tested with Wildly 8.2.0.Final and Glassfish 4.1): https://github.com/StefanHeimberg/stackoverflow-20150993

在没有web.xml和bean.xml的情况下，我都能完成所有工作

i have it all done without web.xml and without beans.xml

经过以下测试:

3倍F5在浏览器中访问的URL http://localhost:8080/mavenproject1 -1.0-SNAPSHOT/webresources/history

3 times F5 in a Browser to the url http://localhost:8080/mavenproject1-1.0-SNAPSHOT/webresources/history

输出:

20:32:12,955 SEVERE [com.mycompany.mavenproject1.HistoryAPI] (default task-2) HistoryAPI.init() called
20:32:12,956 SEVERE [com.mycompany.mavenproject1.HistoryAPI] (default task-2) HistoryAPI.doSomething() called
20:32:12,956 SEVERE [com.mycompany.mavenproject1.History] (default task-2)  ===> History.init() called
20:32:12,956 SEVERE [com.mycompany.mavenproject1.History] (default task-2)  ===> History.doSomething() called 
20:36:09,830 SEVERE [com.mycompany.mavenproject1.HistoryAPI] (default task-3) HistoryAPI.init() called
20:36:09,831 SEVERE [com.mycompany.mavenproject1.HistoryAPI] (default task-3) HistoryAPI.doSomething() called
20:36:09,831 SEVERE [com.mycompany.mavenproject1.History] (default task-3)  ===> History.doSomething() called 
20:36:10,549 SEVERE [com.mycompany.mavenproject1.HistoryAPI] (default task-4) HistoryAPI.init() called
20:36:10,549 SEVERE [com.mycompany.mavenproject1.HistoryAPI] (default task-4) HistoryAPI.doSomething() called
20:36:10,549 SEVERE [com.mycompany.mavenproject1.History] (default task-4)  ===> History.doSomething() called 

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