无法解决这个问题 UnsatisfiedDependencyException: There was no object available for injection at SystemInject

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【中文标题】无法解决这个问题 UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl【英文标题】：Can't solve this issue UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl 【发布时间】：2019-03-01 00:08:39 【问题描述】：

我已经尝试了很多来解决这个问题，但不能。我发现，如果我们使用“abstractBinder”，那么这可以解决，但是一旦我的 Binder 就位，我就会开始出现 404 错误。 

UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl

请帮忙

我的资源：

import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import com.walmart.services.helpers.IUserService;
import com.walmart.services.helpers.ServicesTest;

@Path("/sayHello")
public class ControllerTest 

    @Inject
    private IUserService service;

    @Inject
    private ServicesTest service2;

    @GET
    @Path("/name")
    @Produces(MediaType.TEXT_PLAIN)
    public String method(@PathParam("name") String msg) 
        return service.method() + " msg";
    

    @GET
    @Path("/v2/name")
    @Produces(MediaType.TEXT_PLAIN)
    public String method2(@PathParam("name") String msg) 
        return service2.method() + " msg";

我的资源配置文件：

@ApplicationPath("/rest/*")
public class ResourceConfiguration extends ResourceConfig 

    public ResourceConfiguration() 
        //register(new MyBinder());
        this.packages(true, "com.walmart.services.*");

我的活页夹 [如果有的话] 

public class MyBinder extends AbstractBinder


    @Override
    protected void configure() 
        // TODO Auto-generated method stub

        bind(new ServicesTest()).to(ServicesTest.class);
//      bind(UserServiceImpl.class).to(IUserService.class).in(RequestScoped.class);

服务：

IUserService 及其实现

public interface IUserService 

    public String method();



public class UserServiceImpl implements IUserService 

    @Inject
    public UserServiceImpl() 
        System.out.println("test");
    

    @Override
    public String method() 
        return "Welcome ";

其他

public class ServicesTest 

    public ServicesTest() 
        System.out.println("created ");
    

    public String method() 
        return "Welcome";

WEBXML

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">
    <display-name>com.walmart.learning.javaee</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>


</web-app>

现在，我可以使用 http://localhost:8080/javaeeLearning/rest/sayHello/h

这给了我以下错误

SEVERE: Servlet.service() for servlet [com.walmart.configuration.ResourceConfiguration] in context with path [/javaeeLearning] threw exception [A MultiException has 4 exceptions.  They are:
1. org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl(requiredType=IUserService,parent=ControllerTest,qualifiers=,position=-1,optional=false,self=false,unqualified=null,2007960340)
2. org.glassfish.hk2.api.UnsatisfiedDependencyException: There was no object available for injection at SystemInjecteeImpl(requiredType=ServicesTest,parent=ControllerTest,qualifiers=,position=-1,optional=false,self=false,unqualified=null,10615079)
3. java.lang.IllegalArgumentException: While attempting to resolve the dependencies of com.walmart.services.rest.controller.ControllerTest errors were found
4. java.lang.IllegalStateException: Unable to perform operation: resolve on com.walmart.services.rest.controller.ControllerTest
] with root cause

为了解决这个问题，我在资源配置中取消注释我的 Binder 然后我开始有 404。

请帮忙....

其他细节；

波姆

<name>javaeeLearning</name>
    <properties>
            <maven.compiler.source>10</maven.compiler.source>
            <maven.compiler.target>10</maven.compiler.target>
            <jaxrs.version>2.0.1</jaxrs.version>
            <jersey2.version>2.23</jersey2.version>
            <jersey2.gf.cdi.version>2.14</jersey2.gf.cdi.version>
        </properties>


<dependencies>
    <!-- https://mvnrepository.com/artifact/javax/javaee-api -->
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>8.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.ws.rs/javax.ws.rs-api -->
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>$jaxrs.version</version>
    </dependency>



    <!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-war-plugin -->
    <dependency>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.2</version>
    </dependency>

    <!-- Jersey2.x Dependencies -->

    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-server -->
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-server</artifactId>
        <version>$jersey2.version</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-common -->
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-common</artifactId>
        <version>$jersey2.version</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-client -->
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-client</artifactId>
        <version>$jersey2.version</version>
    </dependency>

    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>$jersey2.version</version>
    </dependency>



    <!-- Jersey2.x Dependency injection -->

    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.inject/jersey-hk2 -->
    <dependency>
        <groupId>org.glassfish.jersey.inject</groupId>
        <artifactId>jersey-hk2</artifactId>
        <version>2.27</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.activation/activation -->
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.0</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.glassfish.jaxb/jaxb-core -->
    <dependency>
        <groupId>org.glassfish.jaxb</groupId>
        <artifactId>jaxb-core</artifactId>
        <version>2.3.0.1</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/com.sun.xml.bind/jaxb-impl -->
    <dependency>
        <groupId>com.sun.xml.bind</groupId>
        <artifactId>jaxb-impl</artifactId>
        <version>2.4.0-b180830.0438</version>
    </dependency>


    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>




    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.media/jersey-media-json-jackson -->
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>$jersey2.version</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.containers.glassfish/jersey-gf-cdi -->
    <dependency>
        <groupId>org.glassfish.jersey.containers.glassfish</groupId>
        <artifactId>jersey-gf-cdi</artifactId>
        <version>$jersey2.gf.cdi.version</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.enterprise/cdi-api -->
    <dependency>
        <groupId>javax.enterprise</groupId>
        <artifactId>cdi-api</artifactId>
        <version>2.0</version>
    </dependency>



</dependencies>

【问题讨论】：

你需要活页夹。将注意力集中在为什么要获得 404。您是否为所有端点获得 404？您是否得出了添加 DI 服务会导致 404 的绝对结论？如果您完全删除所有 DI 服务，一切是否运行正常？ 【参考方案1】：

让您的 JAX-RS 资源成为这样的 CDI bean：

@Path("/sayHello")
@RequestScoped
public class ControllerTest

那么你就不需要 Binder 并且注入应该可以工作。

【讨论】：

是否得到与之前完全相同的异常？如果您不在完整的 Java EE 环境（Tomcat？）中，您可能还需要执行@user3544624 在他的回答中建议的操作。 @PanuHaaramo 您在哪个服务器上运行您发布的代码？ 如果您的 beans.xml 中的 bean 发现模式被注释，请使用上下文范围 bean 注释您的 restful 资源端点。谢谢@PanuHaaramo【参考方案2】：

您可以在beans.xml 中将 bean 发现模式设置为全部：

<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
        http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
       bean-discovery-mode="all">
</beans>

或使用范围注释（如@Dependent）注释UserServiceImpl

【讨论】：

嗨，谢谢你，但我有这个文件。仍然无法正常工作。 你没有在 Resourceconfig 中注册 binder？appsdeveloperblog.com/dependency-injection-hk2-jersey-jax-rs 请添加appsdeveloperblog.com/dependency-injection-hk2-jersey-jax-rs 提到的初始化参数（sevlet 的配置）。

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