WELD-001408:具有限定符@Default的Customer类型的不满意依赖项

Question

我是Java EE新手.我想测试JSF,因此制作了一个简单的程序,但无法部署它.我收到以下错误消息:

cannot Deploy onlineshop-war
deploy is failing=Error occurred during deployment: Exception while loading the app : CDI deployment failure:WELD-001408: Unsatisfied dependencies for type Customer with qualifiers @Default
at injection point [BackedAnnotatedField] @Inject private de.java2enterprise.onlineshop.RegisterController.customer
at de.java2enterprise.onlineshop.RegisterController.customer(RegisterController.java:0)
. Please see server.log for more details.

我的代码如下:Customer.java:

package de.java2enterprise.onlineshop.model;

public class Customer {
    private String email;
    private String password;
}

registerController.java:

package de.java2enterprise.onlineshop;

import java.io.Serializable;
import javax.enterprise.context.RequestScoped;
import javax.inject.Named;
import javax.inject.Inject;
import de.java2enterprise.onlineshop.model.*;

@Named
@RequestScoped
public class RegisterController {

    private static final long serialVersionUID = 1L;

    @Inject
    private Customer customer;

    public Customer getCustomer() {
        return customer;
    }

    public void setCustomer(Customer customer) {
        this.customer = customer;
    }

    public String persist() {
        return "/index.xhtml";
    }
}

为了编译它,我必须包含cdi-api.jar作为外部库.谁在这里可以帮助我？谢谢大家.

Answer 1

你的Customer课必须被CDI发现为一个bean.为此你有两个选择:

1. 在其上放置一个定义注释的bean.这@Model是一种刻板印象,这就是为什么它会成功的原因.像这样的限定符@Named不是定义注释的bean,这是它不起作用的原因

2. 通过在jar中添加文件,将bean归档中的bean发现模式从默认的"annotated"更改为"all" beans.xml.

请记住@Named只有一个用法:将bean暴露给UI.其他用法是针对不良实践或与遗留框架的兼容性.

Answer 2

确保您拥有正确的进口也是一件好事

我遇到了这样的问题，我发现 bean 正在使用

    javax.faces.view.ViewScoped;
                 ^

代替

    javax.faces.bean.ViewScoped;
                 ^