[英]hk2 Dependency Injection on Tomcat
I am trying hard to get some kind of (c)di work for my little web application. 我想很难得到某种(三)二工作为我的小Web应用程序。 I gave up using Weld and now i am trying hk2 (it is already used by jersey 2).
我放弃了使用焊接 ,现在我试图HK2(它已经由球衣2)。 Here is my service that tries to inject something:
这里是我的服务,它会尝试注入的东西:
@ManagedBean
@Path("excelExport")
public class ExcelExportService {
@Inject
ExcelReport excelReport;
/**
*
* @param idString
* crucial to fetch the report
* @return excel document (xlsx) to be downloaded
*/
@GET
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public final Response getExcel(@QueryParam("id") final String idString) {
Long id;
try {
id = Long.valueOf(idString);
} catch (NumberFormatException e) {
return Response.status(Status.BAD_REQUEST).build();
}
return Response.ok(excelReport.getCompleteExcel(id), MediaType.APPLICATION_OCTET_STREAM)
.header("Content-Disposition", "attachment; filename=\"" + "report-" + id + ".xlsx" + "\"")
.build();
}
}
I am not sure if @ManagedBean
is necessary. 我不知道如果
@ManagedBean
是必要的。 The Problem is : 问题是 :
1. org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl(requiredType=ExcelReport,parent=ExcelExportService,qualifiers={},position=-1,optional=false,self=false,unqualified=null,1464117566)
So the inject is simply not working. 所以注入是根本无法工作。 I set up DI as it is described here (see accepted answer).
我设置了DI,因为它是描述在这里 (见接受的答案)。 In my case the binder look like that:
在我的情况下,粘合剂的样子说:
@Override
protected void configure() {
bind(ExcelReport.class).to(ExcelReport.class);
bind(Data.class).to(DataDbImpl.class).in(Singleton.class);
}
I think i wouldn't need the bind of ExcelReport because it has a Constructor that injects Data - right? 我想我不需要ExcelReport的绑定,因为它有注入数据构造 - 对吗? But it isn't working either way.
但这两种方法都不起作用。
My "main" is this 我的“主要”是这样的
public class WebApp extends ResourceConfig{
public WebApp(){
register(Binder.class);
packages("true", "com.prodyna.reportExport.service");
}
}
and web.xml: 和web.xml:
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>reportExport</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.prodyna.WebApp</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>reportExport</servlet-name>
<url-pattern>/webapi/*</url-pattern>
</servlet-mapping>
</web-app>
So how to setup DI properly (my third try will be Guice). 因此,如何建立正确的DI(我的第三次尝试将吉斯)。
UPDATE I am also unsure about the dependencies needed. UPDATE我也不能确定所需的依赖关系。 currently i included this (updated based on hint):
目前我包括了这个(根据提示更新):
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>2.16</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
</dependency>
.....
Sample project trying to solve this problem: https://github.com/miguelangelprogramacion/jersey-dependency-injection 尝试解决此问题的示例项目: https : //github.com/miguelangelprogramacion/jersey-dependency-injection
I used the recommendations of peeskillet, with a modification in the final register process, as you can see in ResourceConfigApp.java 我使用了peeskillet的建议,并在最终注册过程中进行了修改,如您在ResourceConfigApp.java中所见
It should not be register(Binder.class);
它不应该是
register(Binder.class);
, but instead register(new Binder());
,而是
register(new Binder());
UPDATE 更新
Ok, so on top the the above part of the answer, it should also be 好的,所以在答案的上面部分之上,它也应该是
bind(DataDbImpl.class).to(Data.class).in(Singleton.class);
The binding basically reads "bind service to contract" 绑定基本上是“将服务绑定到合同”
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